python的基本数据类型
1、数字
Python 支持三种不同的数值类型：
- 整型(Int) - 通常被称为是整型或整数，是正或负整数，不带小数点。Python3 整型是没有限制大小的，可以当作 Long 类型使用，所以 Python3 没有 Python2 的 Long 类型。
- 浮点型(float) - 浮点型由整数部分与小数部分组成，浮点型也可以使用科学计数法表示（2.5e2 = 2.5 x 102 = 250）
- 复数( (complex)) - 复数由实数部分和虚数部分构成，可以用a + bj,或者complex(a,b)表示， 复数的实部a和虚部b都是浮点型。
Help on class int in module builtins: class int(object) | int([x]) -> integer | int(x, base=10) -> integer | | Convert a number or string to an integer, or return 0 if no arguments | are given. If x is a number, return x.__int__(). For floating point | numbers, this truncates towards zero. | | If x is not a number or if base is given, then x must be a string, | bytes, or bytearray instance representing an integer literal in the | given base. The literal can be preceded by '+' or '-' and be surrounded | by whitespace. The base defaults to 10. Valid bases are 0 and 2-36. | Base 0 means to interpret the base from the string as an integer literal. | >>> int('0b100', base=0) | 4 | | Methods defined here: | | __abs__(self, /) | abs(self) | | __add__(self, value, /) | Return self+value. | | __and__(self, value, /) | Return self&value. | | __bool__(self, /) | self != 0 | | __ceil__(...) | Ceiling of an Integral returns itself. | | __divmod__(self, value, /) | Return divmod(self, value). | | __eq__(self, value, /) | Return self==value. | | __float__(self, /) | float(self) | | __floor__(...) | Flooring an Integral returns itself. | | __floordiv__(self, value, /) | Return self//value. | | __format__(self, format_spec, /) | Default object formatter. | | __ge__(self, value, /) | Return self>=value. | | __getattribute__(self, name, /) | Return getattr(self, name). | | __getnewargs__(self, /) | | __gt__(self, value, /) | Return self>value. | | __hash__(self, /) | Return hash(self). | | __index__(self, /) | Return self converted to an integer, if self is suitable for use as an index into a list. | | __int__(self, /) | int(self) | | __invert__(self, /) | ~self | | __le__(self, value, /) | Return self<=value. | | __lshift__(self, value, /) | Return self<<value. | | __lt__(self, value, /) | Return self<value. | | __mod__(self, value, /) | Return self%value. | | __mul__(self, value, /) | Return self*value. | | __ne__(self, value, /) | Return self!=value. | | __neg__(self, /) | -self | | __or__(self, value, /) | Return self|value. | | __pos__(self, /) | +self | | __pow__(self, value, mod=None, /) | Return pow(self, value, mod). | | __radd__(self, value, /) | Return value+self. | | __rand__(self, value, /) | Return value&self. | | __rdivmod__(self, value, /) | Return divmod(value, self). | | __repr__(self, /) | Return repr(self). | | __rfloordiv__(self, value, /) | Return value//self. | | __rlshift__(self, value, /) | Return value<<self. | | __rmod__(self, value, /) | Return value%self. | | __rmul__(self, value, /) | Return value*self. | | __ror__(self, value, /) | Return value|self. | | __round__(...) | Rounding an Integral returns itself. | Rounding with an ndigits argument also returns an integer. | | __rpow__(self, value, mod=None, /) | Return pow(value, self, mod). | | __rrshift__(self, value, /) | Return value>>self. | | __rshift__(self, value, /) | Return self>>value. | | __rsub__(self, value, /) | Return value-self. | | __rtruediv__(self, value, /) | Return value/self. | | __rxor__(self, value, /) | Return value^self. | | __sizeof__(self, /) | Returns size in memory, in bytes. | | __str__(self, /) | Return str(self). | | __sub__(self, value, /) | Return self-value. | | __truediv__(self, value, /) | Return self/value. | | __trunc__(...) | Truncating an Integral returns itself. | | __xor__(self, value, /) | Return self^value. | | bit_length(self, /) | Number of bits necessary to represent self in binary. | | >>> bin(37) | '0b100101' | >>> (37).bit_length() | 6 | | conjugate(...) | Returns self, the complex conjugate of any int. | | to_bytes(self, /, length, byteorder, *, signed=False) | Return an array of bytes representing an integer. | | length | Length of bytes object to use. An OverflowError is raised if the | integer is not representable with the given number of bytes. | byteorder | The byte order used to represent the integer. If byteorder is 'big', | the most significant byte is at the beginning of the byte array. If | byteorder is 'little', the most significant byte is at the end of the | byte array. To request the native byte order of the host system, use | `sys.byteorder' as the byte order value. | signed | Determines whether two's complement is used to represent the integer. | If signed is False and a negative integer is given, an OverflowError | is raised. | | ---------------------------------------------------------------------- | Class methods defined here: | | from_bytes(bytes, byteorder, *, signed=False) from builtins.type | Return the integer represented by the given array of bytes. | | bytes | Holds the array of bytes to convert. The argument must either | support the buffer protocol or be an iterable object producing bytes. | Bytes and bytearray are examples of built-in objects that support the | buffer protocol. | byteorder | The byte order used to represent the integer. If byteorder is 'big', | the most significant byte is at the beginning of the byte array. If | byteorder is 'little', the most significant byte is at the end of the | byte array. To request the native byte order of the host system, use | `sys.byteorder' as the byte order value. | signed | Indicates whether two's complement is used to represent the integer. | | ---------------------------------------------------------------------- | Static methods defined here: | | __new__(*args, **kwargs) from builtins.type | Create and return a new object. See help(type) for accurate signature. | | ---------------------------------------------------------------------- | Data descriptors defined here: | | denominator | the denominator of a rational number in lowest terms | | imag | the imaginary part of a complex number | | numerator | the numerator of a rational number in lowest terms | | real | the real part of a complex number
Help on class float in module builtins: class float(object) | float(x=0, /) | | Convert a string or number to a floating point number, if possible. | | Methods defined here: | | __abs__(self, /) | abs(self) | | __add__(self, value, /) | Return self+value. | | __bool__(self, /) | self != 0 | | __divmod__(self, value, /) | Return divmod(self, value). | | __eq__(self, value, /) | Return self==value. | | __float__(self, /) | float(self) | | __floordiv__(self, value, /) | Return self//value. | | __format__(self, format_spec, /) | Formats the float according to format_spec. | | __ge__(self, value, /) | Return self>=value. | | __getattribute__(self, name, /) | Return getattr(self, name). | | __getnewargs__(self, /) | | __gt__(self, value, /) | Return self>value. | | __hash__(self, /) | Return hash(self). | | __int__(self, /) | int(self) | | __le__(self, value, /) | Return self<=value. | | __lt__(self, value, /) | Return self<value. | | __mod__(self, value, /) | Return self%value. | | __mul__(self, value, /) | Return self*value. | | __ne__(self, value, /) | Return self!=value. | | __neg__(self, /) | -self | | __pos__(self, /) | +self | | __pow__(self, value, mod=None, /) | Return pow(self, value, mod). | | __radd__(self, value, /) | Return value+self. | | __rdivmod__(self, value, /) | Return divmod(value, self). | | __repr__(self, /) | Return repr(self). | | __rfloordiv__(self, value, /) | Return value//self. | | __rmod__(self, value, /) | Return value%self. | | __rmul__(self, value, /) | Return value*self. | | __round__(self, ndigits=None, /) | Return the Integral closest to x, rounding half toward even. | | When an argument is passed, work like built-in round(x, ndigits). | | __rpow__(self, value, mod=None, /) | Return pow(value, self, mod). | | __rsub__(self, value, /) | Return value-self. | | __rtruediv__(self, value, /) | Return value/self. | | __str__(self, /) | Return str(self). | | __sub__(self, value, /) | Return self-value. | | __truediv__(self, value, /) | Return self/value. | | __trunc__(self, /) | Return the Integral closest to x between 0 and x. | | as_integer_ratio(self, /) | Return integer ratio. | | Return a pair of integers, whose ratio is exactly equal to the original float | and with a positive denominator. | | Raise OverflowError on infinities and a ValueError on NaNs. | | >>> (10.0).as_integer_ratio() | (10, 1) | >>> (0.0).as_integer_ratio() | (0, 1) | >>> (-.25).as_integer_ratio() | (-1, 4) | | conjugate(self, /) | Return self, the complex conjugate of any float. | | hex(self, /) | Return a hexadecimal representation of a floating-point number. | | >>> (-0.1).hex() | '-0x1.999999999999ap-4' | >>> 3.14159.hex() | '0x1.921f9f01b866ep+1' | | is_integer(self, /) | Return True if the float is an integer. | | ---------------------------------------------------------------------- | Class methods defined here: | | __getformat__(typestr, /) from builtins.type | You probably don't want to use this function. | | typestr | Must be 'double' or 'float'. | | It exists mainly to be used in Python's test suite. | | This function returns whichever of 'unknown', 'IEEE, big-endian' or 'IEEE, | little-endian' best describes the format of floating point numbers used by the | C type named by typestr. | | __set_format__(typestr, fmt, /) from builtins.type | You probably don't want to use this function. | | typestr | Must be 'double' or 'float'. | fmt | Must be one of 'unknown', 'IEEE, big-endian' or 'IEEE, little-endian', | and in addition can only be one of the latter two if it appears to | match the underlying C reality. | | It exists mainly to be used in Python's test suite. | | Override the automatic determination of C-level floating point type. | This affects how floats are converted to and from binary strings. | | fromhex(string, /) from builtins.type | Create a floating-point number from a hexadecimal string. | | >>> float.fromhex('0x1.ffffp10') | 2047.984375 | >>> float.fromhex('-0x1p-1074') | -5e-324 | | ---------------------------------------------------------------------- | Static methods defined here: | | __new__(*args, **kwargs) from builtins.type | Create and return a new object. See help(type) for accurate signature. | | ---------------------------------------------------------------------- | Data descriptors defined here: | | imag | the imaginary part of a complex number | | real | the real part of a complex number
Help on class complex in module builtins: class complex(object) | complex(real=0, imag=0) | | Create a complex number from a real part and an optional imaginary part. | | This is equivalent to (real + imag*1j) where imag defaults to 0. | | Methods defined here: | | __abs__(self, /) | abs(self) | | __add__(self, value, /) | Return self+value. | | __bool__(self, /) | self != 0 | | __divmod__(self, value, /) | Return divmod(self, value). | | __eq__(self, value, /) | Return self==value. | | __float__(self, /) | float(self) | | __floordiv__(self, value, /) | Return self//value. | | __format__(...) | complex.__format__() -> str | | Convert to a string according to format_spec. | | __ge__(self, value, /) | Return self>=value. | | __getattribute__(self, name, /) | Return getattr(self, name). | | __getnewargs__(...) | | __gt__(self, value, /) | Return self>value. | | __hash__(self, /) | Return hash(self). | | __int__(self, /) | int(self) | | __le__(self, value, /) | Return self<=value. | | __lt__(self, value, /) | Return self<value. | | __mod__(self, value, /) | Return self%value. | | __mul__(self, value, /) | Return self*value. | | __ne__(self, value, /) | Return self!=value. | | __neg__(self, /) | -self | | __pos__(self, /) | +self | | __pow__(self, value, mod=None, /) | Return pow(self, value, mod). | | __radd__(self, value, /) | Return value+self. | | __rdivmod__(self, value, /) | Return divmod(value, self). | | __repr__(self, /) | Return repr(self). | | __rfloordiv__(self, value, /) | Return value//self. | | __rmod__(self, value, /) | Return value%self. | | __rmul__(self, value, /) | Return value*self. | | __rpow__(self, value, mod=None, /) | Return pow(value, self, mod). | | __rsub__(self, value, /) | Return value-self. | | __rtruediv__(self, value, /) | Return value/self. | | __str__(self, /) | Return str(self). | | __sub__(self, value, /) | Return self-value. | | __truediv__(self, value, /) | Return self/value. | | conjugate(...) | complex.conjugate() -> complex | | Return the complex conjugate of its argument. (3-4j).conjugate() == 3+4j. | | ---------------------------------------------------------------------- | Static methods defined here: | | __new__(*args, **kwargs) from builtins.type | Create and return a new object. See help(type) for accurate signature. | | ---------------------------------------------------------------------- | Data descriptors defined here: | | imag | the imaginary part of a complex number | | real | the real part of a complex number
2、布尔值
真或假
1 或 0
3、字符串
var1 = 'Hello World!'
var2 = "Hello World!"
字符串常用功能：
- 移除空白
- 分割
- 长度
- 索引
- 切片
Help on class str in module builtins: class str(object) | str(object='') -> str | str(bytes_or_buffer[, encoding[, errors]]) -> str | | Create a new string object from the given object. If encoding or | errors is specified, then the object must expose a data buffer | that will be decoded using the given encoding and error handler. | Otherwise, returns the result of object.__str__() (if defined) | or repr(object). | encoding defaults to sys.getdefaultencoding(). | errors defaults to 'strict'. | | Methods defined here: | | __add__(self, value, /) | Return self+value. | | __contains__(self, key, /) | Return key in self. | | __eq__(self, value, /) | Return self==value. | | __format__(self, format_spec, /) | Return a formatted version of the string as described by format_spec. | | __ge__(self, value, /) | Return self>=value. | | __getattribute__(self, name, /) | Return getattr(self, name). | | __getitem__(self, key, /) | Return self[key]. | | __getnewargs__(...) | | __gt__(self, value, /) | Return self>value. | | __hash__(self, /) | Return hash(self). | | __iter__(self, /) | Implement iter(self). | | __le__(self, value, /) | Return self<=value. | | __len__(self, /) | Return len(self). | | __lt__(self, value, /) | Return self<value. | | __mod__(self, value, /) | Return self%value. | | __mul__(self, value, /) | Return self*value. | | __ne__(self, value, /) | Return self!=value. | | __repr__(self, /) | Return repr(self). | | __rmod__(self, value, /) | Return value%self. | | __rmul__(self, value, /) | Return value*self. | | __sizeof__(self, /) | Return the size of the string in memory, in bytes. | | __str__(self, /) | Return str(self). | | capitalize(self, /) | Return a capitalized version of the string. | | More specifically, make the first character have upper case and the rest lower | case. | | casefold(self, /) | Return a version of the string suitable for caseless comparisons. | | center(self, width, fillchar=' ', /) | Return a centered string of length width. | | Padding is done using the specified fill character (default is a space). | | count(...) | S.count(sub[, start[, end]]) -> int | | Return the number of non-overlapping occurrences of substring sub in | string S[start:end]. Optional arguments start and end are | interpreted as in slice notation. | | encode(self, /, encoding='utf-8', errors='strict') | Encode the string using the codec registered for encoding. | | encoding | The encoding in which to encode the string. | errors | The error handling scheme to use for encoding errors. | The default is 'strict' meaning that encoding errors raise a | UnicodeEncodeError. Other possible values are 'ignore', 'replace' and | 'xmlcharrefreplace' as well as any other name registered with | codecs.register_error that can handle UnicodeEncodeErrors. | | endswith(...) | S.endswith(suffix[, start[, end]]) -> bool | | Return True if S ends with the specified suffix, False otherwise. | With optional start, test S beginning at that position. | With optional end, stop comparing S at that position. | suffix can also be a tuple of strings to try. | | expandtabs(self, /, tabsize=8) | Return a copy where all tab characters are expanded using spaces. | | If tabsize is not given, a tab size of 8 characters is assumed. | | find(...) | S.find(sub[, start[, end]]) -> int | | Return the lowest index in S where substring sub is found, | such that sub is contained within S[start:end]. Optional | arguments start and end are interpreted as in slice notation. | | Return -1 on failure. | | format(...) | S.format(*args, **kwargs) -> str | | Return a formatted version of S, using substitutions from args and kwargs. | The substitutions are identified by braces ('{' and '}'). | | format_map(...) | S.format_map(mapping) -> str | | Return a formatted version of S, using substitutions from mapping. | The substitutions are identified by braces ('{' and '}'). | | index(...) | S.index(sub[, start[, end]]) -> int | | Return the lowest index in S where substring sub is found, | such that sub is contained within S[start:end]. Optional | arguments start and end are interpreted as in slice notation. | | Raises ValueError when the substring is not found. | | isalnum(self, /) | Return True if the string is an alpha-numeric string, False otherwise. | | A string is alpha-numeric if all characters in the string are alpha-numeric and | there is at least one character in the string. | | isalpha(self, /) | Return True if the string is an alphabetic string, False otherwise. | | A string is alphabetic if all characters in the string are alphabetic and there | is at least one character in the string. | | isascii(self, /) | Return True if all characters in the string are ASCII, False otherwise. | | ASCII characters have code points in the range U+0000-U+007F. | Empty string is ASCII too. | | isdecimal(self, /) | Return True if the string is a decimal string, False otherwise. | | A string is a decimal string if all characters in the string are decimal and | there is at least one character in the string. | | isdigit(self, /) | Return True if the string is a digit string, False otherwise. | | A string is a digit string if all characters in the string are digits and there | is at least one character in the string. | | isidentifier(self, /) | Return True if the string is a valid Python identifier, False otherwise. | | Use keyword.iskeyword() to test for reserved identifiers such as "def" and | "class". | | islower(self, /) | Return True if the string is a lowercase string, False otherwise. | | A string is lowercase if all cased characters in the string are lowercase and | there is at least one cased character in the string. | | isnumeric(self, /) | Return True if the string is a numeric string, False otherwise. | | A string is numeric if all characters in the string are numeric and there is at | least one character in the string. | | isprintable(self, /) | Return True if the string is printable, False otherwise. | | A string is printable if all of its characters are considered printable in | repr() or if it is empty. | | isspace(self, /) | Return True if the string is a whitespace string, False otherwise. | | A string is whitespace if all characters in the string are whitespace and there | is at least one character in the string. | | istitle(self, /) | Return True if the string is a title-cased string, False otherwise. | | In a title-cased string, upper- and title-case characters may only | follow uncased characters and lowercase characters only cased ones. | | isupper(self, /) | Return True if the string is an uppercase string, False otherwise. | | A string is uppercase if all cased characters in the string are uppercase and | there is at least one cased character in the string. | | join(self, iterable, /) | Concatenate any number of strings. | | The string whose method is called is inserted in between each given string. | The result is returned as a new string. | | Example: '.'.join(['ab', 'pq', 'rs']) -> 'ab.pq.rs' | | ljust(self, width, fillchar=' ', /) | Return a left-justified string of length width. | | Padding is done using the specified fill character (default is a space). | | lower(self, /) | Return a copy of the string converted to lowercase. | | lstrip(self, chars=None, /) | Return a copy of the string with leading whitespace removed. | | If chars is given and not None, remove characters in chars instead. | | partition(self, sep, /) | Partition the string into three parts using the given separator. | | This will search for the separator in the string. If the separator is found, | returns a 3-tuple containing the part before the separator, the separator | itself, and the part after it. | | If the separator is not found, returns a 3-tuple containing the original string | and two empty strings. | | replace(self, old, new, count=-1, /) | Return a copy with all occurrences of substring old replaced by new. | | count | Maximum number of occurrences to replace. | -1 (the default value) means replace all occurrences. | | If the optional argument count is given, only the first count occurrences are | replaced. | | rfind(...) | S.rfind(sub[, start[, end]]) -> int | | Return the highest index in S where substring sub is found, | such that sub is contained within S[start:end]. Optional | arguments start and end are interpreted as in slice notation. | | Return -1 on failure. | | rindex(...) | S.rindex(sub[, start[, end]]) -> int | | Return the highest index in S where substring sub is found, | such that sub is contained within S[start:end]. Optional | arguments start and end are interpreted as in slice notation. | | Raises ValueError when the substring is not found. | | rjust(self, width, fillchar=' ', /) | Return a right-justified string of length width. | | Padding is done using the specified fill character (default is a space). | | rpartition(self, sep, /) | Partition the string into three parts using the given separator. | | This will search for the separator in the string, starting at the end. If | the separator is found, returns a 3-tuple containing the part before the | separator, the separator itself, and the part after it. | | If the separator is not found, returns a 3-tuple containing two empty strings | and the original string. | | rsplit(self, /, sep=None, maxsplit=-1) | Return a list of the words in the string, using sep as the delimiter string. | | sep | The delimiter according which to split the string. | None (the default value) means split according to any whitespace, | and discard empty strings from the result. | maxsplit | Maximum number of splits to do. | -1 (the default value) means no limit. | | Splits are done starting at the end of the string and working to the front. | | rstrip(self, chars=None, /) | Return a copy of the string with trailing whitespace removed. | | If chars is given and not None, remove characters in chars instead. | | split(self, /, sep=None, maxsplit=-1) | Return a list of the words in the string, using sep as the delimiter string. | | sep | The delimiter according which to split the string. | None (the default value) means split according to any whitespace, | and discard empty strings from the result. | maxsplit | Maximum number of splits to do. | -1 (the default value) means no limit. | | splitlines(self, /, keepends=False) | Return a list of the lines in the string, breaking at line boundaries. | | Line breaks are not included in the resulting list unless keepends is given and | true. | | startswith(...) | S.startswith(prefix[, start[, end]]) -> bool | | Return True if S starts with the specified prefix, False otherwise. | With optional start, test S beginning at that position. | With optional end, stop comparing S at that position. | prefix can also be a tuple of strings to try. | | strip(self, chars=None, /) | Return a copy of the string with leading and trailing whitespace remove. | | If chars is given and not None, remove characters in chars instead. | | swapcase(self, /) | Convert uppercase characters to lowercase and lowercase characters to uppercase. | | title(self, /) | Return a version of the string where each word is titlecased. | | More specifically, words start with uppercased characters and all remaining | cased characters have lower case. | | translate(self, table, /) | Replace each character in the string using the given translation table. | | table | Translation table, which must be a mapping of Unicode ordinals to | Unicode ordinals, strings, or None. | | The table must implement lookup/indexing via __getitem__, for instance a | dictionary or list. If this operation raises LookupError, the character is | left untouched. Characters mapped to None are deleted. | | upper(self, /) | Return a copy of the string converted to uppercase. | | zfill(self, width, /) | Pad a numeric string with zeros on the left, to fill a field of the given width. | | The string is never truncated. | | ---------------------------------------------------------------------- | Static methods defined here: | | __new__(*args, **kwargs) from builtins.type | Create and return a new object. See help(type) for accurate signature. | | maketrans(x, y=None, z=None, /) | Return a translation table usable for str.translate(). | | If there is only one argument, it must be a dictionary mapping Unicode | ordinals (integers) or characters to Unicode ordinals, strings or None. | Character keys will be then converted to ordinals. | If there are two arguments, they must be strings of equal length, and | in the resulting dictionary, each character in x will be mapped to the | character at the same position in y. If there is a third argument, it | must be a string, whose characters will be mapped to None in the result.
4、列表
创建列表：
name_list = ['alex', 'seven', 'eric'] 或 name_list ＝ list(['alex', 'seven', 'eric'])
Help on class list in module builtins: class list(object) | list(iterable=(), /) | | Built-in mutable sequence. | | If no argument is given, the constructor creates a new empty list. | The argument must be an iterable if specified. | | Methods defined here: | | __add__(self, value, /) | Return self+value. | | __contains__(self, key, /) | Return key in self. | | __delitem__(self, key, /) | Delete self[key]. | | __eq__(self, value, /) | Return self==value. | | __ge__(self, value, /) | Return self>=value. | | __getattribute__(self, name, /) | Return getattr(self, name). | | __getitem__(...) | x.__getitem__(y) <==> x[y] | | __gt__(self, value, /) | Return self>value. | | __iadd__(self, value, /) | Implement self+=value. | | __imul__(self, value, /) | Implement self*=value. | | __init__(self, /, *args, **kwargs) | Initialize self. See help(type(self)) for accurate signature. | | __iter__(self, /) | Implement iter(self). | | __le__(self, value, /) | Return self<=value. | | __len__(self, /) | Return len(self). | | __lt__(self, value, /) | Return self<value. | | __mul__(self, value, /) | Return self*value. | | __ne__(self, value, /) | Return self!=value. | | __repr__(self, /) | Return repr(self). | | __reversed__(self, /) | Return a reverse iterator over the list. | | __rmul__(self, value, /) | Return value*self. | | __setitem__(self, key, value, /) | Set self[key] to value. | | __sizeof__(self, /) | Return the size of the list in memory, in bytes. | | append(self, object, /) | Append object to the end of the list. | | clear(self, /) | Remove all items from list. | | copy(self, /) | Return a shallow copy of the list. | | count(self, value, /) | Return number of occurrences of value. | | extend(self, iterable, /) | Extend list by appending elements from the iterable. | | index(self, value, start=0, stop=9223372036854775807, /) | Return first index of value. | | Raises ValueError if the value is not present. | | insert(self, index, object, /) | Insert object before index. | | pop(self, index=-1, /) | Remove and return item at index (default last). | | Raises IndexError if list is empty or index is out of range. | | remove(self, value, /) | Remove first occurrence of value. | | Raises ValueError if the value is not present. | | reverse(self, /) | Reverse *IN PLACE*. | | sort(self, /, *, key=None, reverse=False) | Stable sort *IN PLACE*. | | ---------------------------------------------------------------------- | Static methods defined here: | | __new__(*args, **kwargs) from builtins.type | Create and return a new object. See help(type) for accurate signature. | | ---------------------------------------------------------------------- | Data and other attributes defined here: | | __hash__ = None
5、元祖
创建元祖：
ages = (11, 22, 33, 44, 55)
或
ages = tuple((11, 22, 33, 44, 55))
基本操作：
- 索引
- 切片
- 循环
- 长度
- 包含
Help on class tuple in module builtins: class tuple(object) | tuple(iterable=(), /) | | Built-in immutable sequence. | | If no argument is given, the constructor returns an empty tuple. | If iterable is specified the tuple is initialized from iterable's items. | | If the argument is a tuple, the return value is the same object. | | Methods defined here: | | __add__(self, value, /) | Return self+value. | | __contains__(self, key, /) | Return key in self. | | __eq__(self, value, /) | Return self==value. | | __ge__(self, value, /) | Return self>=value. | | __getattribute__(self, name, /) | Return getattr(self, name). | | __getitem__(self, key, /) | Return self[key]. | | __getnewargs__(self, /) | | __gt__(self, value, /) | Return self>value. | | __hash__(self, /) | Return hash(self). | | __iter__(self, /) | Implement iter(self). | | __le__(self, value, /) | Return self<=value. | | __len__(self, /) | Return len(self). | | __lt__(self, value, /) | Return self<value. | | __mul__(self, value, /) | Return self*value. | | __ne__(self, value, /) | Return self!=value. | | __repr__(self, /) | Return repr(self). | | __rmul__(self, value, /) | Return value*self. | | count(self, value, /) | Return number of occurrences of value. | | index(self, value, start=0, stop=9223372036854775807, /) | Return first index of value. | | Raises ValueError if the value is not present. | | ---------------------------------------------------------------------- | Static methods defined here: | | __new__(*args, **kwargs) from builtins.type | Create and return a new object. See help(type) for accurate signature.
6、字典（无序）
创建字典：
person = {"name": "mr.wu", 'age': 18}
或
person = dict({"name": "mr.wu", 'age': 18})
Help on class dict in module builtins: class dict(object) | dict() -> new empty dictionary | dict(mapping) -> new dictionary initialized from a mapping object's | (key, value) pairs | dict(iterable) -> new dictionary initialized as if via: | d = {} | for k, v in iterable: | d[k] = v | dict(**kwargs) -> new dictionary initialized with the name=value pairs | in the keyword argument list. For example: dict(one=1, two=2) | | Methods defined here: | | __contains__(self, key, /) | True if the dictionary has the specified key, else False. | | __delitem__(self, key, /) | Delete self[key]. | | __eq__(self, value, /) | Return self==value. | | __ge__(self, value, /) | Return self>=value. | | __getattribute__(self, name, /) | Return getattr(self, name). | | __getitem__(...) | x.__getitem__(y) <==> x[y] | | __gt__(self, value, /) | Return self>value. | | __init__(self, /, *args, **kwargs) | Initialize self. See help(type(self)) for accurate signature. | | __iter__(self, /) | Implement iter(self). | | __le__(self, value, /) | Return self<=value. | | __len__(self, /) | Return len(self). | | __lt__(self, value, /) | Return self<value. | | __ne__(self, value, /) | Return self!=value. | | __repr__(self, /) | Return repr(self). | | __setitem__(self, key, value, /) | Set self[key] to value. | | __sizeof__(...) | D.__sizeof__() -> size of D in memory, in bytes | | clear(...) | D.clear() -> None. Remove all items from D. | | copy(...) | D.copy() -> a shallow copy of D | | get(self, key, default=None, /) | Return the value for key if key is in the dictionary, else default. | | items(...) | D.items() -> a set-like object providing a view on D's items | | keys(...) | D.keys() -> a set-like object providing a view on D's keys | | pop(...) | D.pop(k[,d]) -> v, remove specified key and return the corresponding value. | If key is not found, d is returned if given, otherwise KeyError is raised | | popitem(...) | D.popitem() -> (k, v), remove and return some (key, value) pair as a | 2-tuple; but raise KeyError if D is empty. | | setdefault(self, key, default=None, /) | Insert key with a value of default if key is not in the dictionary. | | Return the value for key if key is in the dictionary, else default. | | update(...) | D.update([E, ]**F) -> None. Update D from dict/iterable E and F. | If E is present and has a .keys() method, then does: for k in E: D[k] = E[k] | If E is present and lacks a .keys() method, then does: for k, v in E: D[k] = v | In either case, this is followed by: for k in F: D[k] = F[k] | | values(...) | D.values() -> an object providing a view on D's values | | ---------------------------------------------------------------------- | Class methods defined here: | | fromkeys(iterable, value=None, /) from builtins.type | Create a new dictionary with keys from iterable and values set to value. | | ---------------------------------------------------------------------- | Static methods defined here: | | __new__(*args, **kwargs) from builtins.type | Create and return a new object. See help(type) for accurate signature. | | ---------------------------------------------------------------------- | Data and other attributes defined here: | | __hash__ = None
7、set
set集合，是一个无序且不重复的元素集合
Help on class set in module builtins: class set(object) | set() -> new empty set object | set(iterable) -> new set object | | Build an unordered collection of unique elements. | | Methods defined here: | | __and__(self, value, /) | Return self&value. | | __contains__(...) | x.__contains__(y) <==> y in x. | | __eq__(self, value, /) | Return self==value. | | __ge__(self, value, /) | Return self>=value. | | __getattribute__(self, name, /) | Return getattr(self, name). | | __gt__(self, value, /) | Return self>value. | | __iand__(self, value, /) | Return self&=value. | | __init__(self, /, *args, **kwargs) | Initialize self. See help(type(self)) for accurate signature. | | __ior__(self, value, /) | Return self|=value. | | __isub__(self, value, /) | Return self-=value. | | __iter__(self, /) | Implement iter(self). | | __ixor__(self, value, /) | Return self^=value. | | __le__(self, value, /) | Return self<=value. | | __len__(self, /) | Return len(self). | | __lt__(self, value, /) | Return self<value. | | __ne__(self, value, /) | Return self!=value. | | __or__(self, value, /) | Return self|value. | | __rand__(self, value, /) | Return value&self. | | __reduce__(...) | Return state information for pickling. | | __repr__(self, /) | Return repr(self). | | __ror__(self, value, /) | Return value|self. | | __rsub__(self, value, /) | Return value-self. | | __rxor__(self, value, /) | Return value^self. | | __sizeof__(...) | S.__sizeof__() -> size of S in memory, in bytes | | __sub__(self, value, /) | Return self-value. | | __xor__(self, value, /) | Return self^value. | | add(...) | Add an element to a set. | | This has no effect if the element is already present. | | clear(...) | Remove all elements from this set. | | copy(...) | Return a shallow copy of a set. | | difference(...) | Return the difference of two or more sets as a new set. | | (i.e. all elements that are in this set but not the others.) | | difference_update(...) | Remove all elements of another set from this set. | | discard(...) | Remove an element from a set if it is a member. | | If the element is not a member, do nothing. | | intersection(...) | Return the intersection of two sets as a new set. | | (i.e. all elements that are in both sets.) | | intersection_update(...) | Update a set with the intersection of itself and another. | | isdisjoint(...) | Return True if two sets have a null intersection. | | issubset(...) | Report whether another set contains this set. | | issuperset(...) | Report whether this set contains another set. | | pop(...) | Remove and return an arbitrary set element. | Raises KeyError if the set is empty. | | remove(...) | Remove an element from a set; it must be a member. | | If the element is not a member, raise a KeyError. | | symmetric_difference(...) | Return the symmetric difference of two sets as a new set. | | (i.e. all elements that are in exactly one of the sets.) | | symmetric_difference_update(...) | Update a set with the symmetric difference of itself and another. | | union(...) | Return the union of sets as a new set. | | (i.e. all elements that are in either set.) | | update(...) | Update a set with the union of itself and others. | | ---------------------------------------------------------------------- | Static methods defined here: | | __new__(*args, **kwargs) from builtins.type | Create and return a new object. See help(type) for accurate signature. | | ---------------------------------------------------------------------- | Data and other attributes defined here: | | __hash__ = None
