Python中基本数据类型的学习
基本数据类型
Python中的基本数据类型分为：数字，字符串，布尔值，列表，元组，字典
关于这些基本数据类型对象常见掉用法介绍
数字： int
（int型所有功能都在 int 里面，在Pychram中建立文件输入int，按住Crtl鼠标点击int 进入查看）
#将字符串转换为数字 a = "123" b = int(a) #会报错转换中的字符串只能有数字 a = "123" b = int(a) #将字符串按base进制转换为10进制 a = "0011" b = int(a,base=2) print(b)#s输出为3 #--bit_length()将当前数字用二进制数所表示的位数 a = 5 print(a.bit_length()) #输出为3
字符串：str
（srt型所有功能都在 str 里面，在Pychram中建立文件输入str，按住Crtl鼠标点击str 进入查看）
1 class str(object): 2 """ 3 str(object='') -> str 4 str(bytes_or_buffer[, encoding[, errors]]) -> str 5 6 Create a new string object from the given object. If encoding or 7 errors is specified, then the object must expose a data buffer 8 that will be decoded using the given encoding and error handler. 9 Otherwise, returns the result of object.__str__() (if defined) 10 or repr(object). 11 encoding defaults to sys.getdefaultencoding(). 12 errors defaults to 'strict'. 13 """ 14 def capitalize(self): # real signature unknown; restored from __doc__ 15 """ 首字母大写其他的全部小写""" 16 """ 17 S.capitalize() -> str 18 19 Return a capitalized version of S, i.e. make the first character 20 have upper case and the rest lower case. 21 """ 22 return "" 23 24 def casefold(self): # real signature unknown; restored from __doc__ 25 """ 所有字符小写（比更加牛能把很多未知的对应变小写）""" 26 """ 27 S.casefold() -> str 28 29 Return a version of S suitable for caseless comparisons. 30 """ 31 return "" 32 33 def center(self, width, fillchar=None): # real signature unknown; restored from __doc__ 34 """字符居中； width：总长度 ； fillchar：空白处填内容 默认无""" 35 """ 36 S.center(width[, fillchar]) -> str 37 38 Return S centered in a string of length width. Padding is 39 done using the specified fill character (default is a space) 40 """ 41 return "" 42 43 def count(self, sub, start=None, end=None): # real signature unknown; restored from __doc__ 44 """计算出字符串sub参数在出现几次, start：起始位置；end：结束位置""" 45 """ 46 S.count(sub[, start[, end]]) -> int 47 48 Return the number of non-overlapping occurrences of substring sub in 49 string S[start:end]. Optional arguments start and end are 50 interpreted as in slice notation. 51 """ 52 return 0 53 54 def endswith(self, suffix, start=None, end=None): # real signature unknown; restored from __doc__ 55 """判断是否以suffix参数结尾 start:起始位置；end结束位置""" 56 """ 57 S.endswith(suffix[, start[, end]]) -> bool 58 59 Return True if S ends with the specified suffix, False otherwise. 60 With optional start, test S beginning at that position. 61 With optional end, stop comparing S at that position. 62 suffix can also be a tuple of strings to try. 63 """ 64 return False 65 66 def expandtabs(self, tabsize=8): # real signature unknown; restored from __doc__ 67 """以tabsize参数分割字符串，遇到'\t'不足的用空格补齐""" 68 """ 69 S.expandtabs(tabsize=8) -> str 70 71 Return a copy of S where all tab characters are expanded using spaces. 72 If tabsize is not given, a tab size of 8 characters is assumed. 73 """ 74 return "" 75 76 def find(self, sub, start=None, end=None): # real signature unknown; restored from __doc__ 77 """寻找子序列，找到第一个返回位置，找不到返回-1""" 78 """ 79 S.find(sub[, start[, end]]) -> int 80 81 Return the lowest index in S where substring sub is found, 82 such that sub is contained within S[start:end]. Optional 83 arguments start and end are interpreted as in slice notation. 84 85 Return -1 on failure. 86 """ 87 return 0 88 89 def format(*args, **kwargs): # known special case of str.format 90 """字符串插入，动态参数，第一个参数列表形式，第二个传入字典""" 91 """ 92 S.format(*args, **kwargs) -> str 93 94 Return a formatted version of S, using substitutions from args and kwargs. 95 The substitutions are identified by braces ('{' and '}'). 96 """ 97 pass 98 99 def format_map(self, mapping): # real signature unknown; restored from __doc__ 100 """传入格式为字典形式的""" 101 """ 102 S.format_map(mapping) -> str 103 104 Return a formatted version of S, using substitutions from mapping. 105 The substitutions are identified by braces ('{' and '}'). 106 """ 107 return "" 108 109 def index(self, sub, start=None, end=None): # real signature unknown; restored from __doc__ 110 """和find一样寻找子序列位置，但没找到会报错，""" 111 """ 112 S.index(sub[, start[, end]]) -> int 113 114 Like S.find() but raise ValueError when the substring is not found. 115 """ 116 return 0 117 118 def isalnum(self): # real signature unknown; restored from __doc__ 119 """判断是否只有数字和字符 是返回true，否则返回false""" 120 """ 121 S.isalnum() -> bool 122 123 Return True if all characters in S are alphanumeric 124 and there is at least one character in S, False otherwise. 125 """ 126 return False 127 128 def isalpha(self): # real signature unknown; restored from __doc__ 129 """判断是否只有字符 是返回true，否则返回false""" 130 """ 131 S.isalpha() -> bool 132 133 Return True if all characters in S are alphabetic 134 and there is at least one character in S, False otherwise. 135 """ 136 return False 137 138 def isdecimal(self): # real signature unknown; restored from __doc__ 139 """判断是否是数字（实际中用的更多） 是返回true，否则返回false""" 140 """ 141 S.isdecimal() -> bool 142 143 Return True if there are only decimal characters in S, 144 False otherwise. 145 """ 146 return False 147 148 def isdigit(self): # real signature unknown; restored from __doc__ 149 """判断是否是数字（比上面支持的种类多，不支持中文如二） 是返回true，否则返回false""" 150 """ 151 S.isdigit() -> bool 152 153 Return True if all characters in S are digits 154 and there is at least one character in S, False otherwise. 155 """ 156 return False 157 158 def isidentifier(self): # real signature unknown; restored from __doc__ 159 """是否符合变量的书写方式""" 160 """ 161 S.isidentifier() -> bool 162 163 Return True if S is a valid identifier according 164 to the language definition. 165 166 Use keyword.iskeyword() to test for reserved identifiers 167 such as "def" and "class". 168 """ 169 return False 170 171 def islower(self): # real signature unknown; restored from __doc__ 172 """判断字母是否全是小写""" 173 """ 174 S.islower() -> bool 175 176 Return True if all cased characters in S are lowercase and there is 177 at least one cased character in S, False otherwise. 178 """ 179 return False 180 181 def isnumeric(self): # real signature unknown; restored from __doc__ 182 """判断是否是数字（支持更多如中文） 是返回true，否则返回false""" 183 """ 184 S.isnumeric() -> bool 185 186 Return True if there are only numeric characters in S, 187 False otherwise. 188 """ 189 return False 190 191 def isprintable(self): # real signature unknown; restored from __doc__ 192 """是否有不可显示的字符串如'\t','\n'""" 193 """ 194 S.isprintable() -> bool 195 196 Return True if all characters in S are considered 197 printable in repr() or S is empty, False otherwise. 198 """ 199 return False 200 201 def isspace(self): # real signature unknown; restored from __doc__ 202 """是否全是空格""" 203 """ 204 S.isspace() -> bool 205 206 Return True if all characters in S are whitespace 207 and there is at least one character in S, False otherwise. 208 """ 209 return False 210 211 def istitle(self): # real signature unknown; restored from __doc__ 212 """是否是标题形式的如 The Book （首字母大写）""" 213 """ 214 S.istitle() -> bool 215 216 Return True if S is a titlecased string and there is at least one 217 character in S, i.e. upper- and titlecase characters may only 218 follow uncased characters and lowercase characters only cased ones. 219 Return False otherwise. 220 """ 221 return False 222 223 def isupper(self): # real signature unknown; restored from __doc__ 224 """判断字母是否全部是大写""" 225 """ 226 S.isupper() -> bool 227 228 Return True if all cased characters in S are uppercase and there is 229 at least one cased character in S, False otherwise. 230 """ 231 return False 232 233 def join(self, iterable): # real signature unknown; restored from __doc__ 234 """将iterable参数中的每个元素按照指定分隔符（调用join的变量）进行拼接""" 235 """ 236 S.join(iterable) -> str 237 238 Return a string which is the concatenation of the strings in the 239 iterable. The separator between elements is S. 240 """ 241 return "" 242 243 def ljust(self, width, fillchar=None): # real signature unknown; restored from __doc__ 244 """将字符串放在左边，用法和center一样""" 245 """ 246 S.ljust(width[, fillchar]) -> str 247 248 Return S left-justified in a Unicode string of length width. Padding is 249 done using the specified fill character (default is a space). 250 """ 251 return "" 252 253 def lower(self): # real signature unknown; restored from __doc__ 254 """将字符串转换成小写""" 255 """ 256 S.lower() -> str 257 258 Return a copy of the string S converted to lowercase. 259 """ 260 return "" 261 262 def lstrip(self, chars=None): # real signature unknown; restored from __doc__ 263 """去除左边开始chars参数所代表的字符串（包括其子字符串可自由组合）,没有不去除，不填默认去除多余空格还有（'\t','\]n'）；""" 264 """ 265 S.lstrip([chars]) -> str 266 267 Return a copy of the string S with leading whitespace removed. 268 If chars is given and not None, remove characters in chars instead. 269 """ 270 return "" 271 272 def maketrans(self, *args, **kwargs): # real signature unknown 273 """做一个对应关系 如maketrans("abcd','1234') 将'abcvd','1234'一一对应返回， 274 调用translate时用到 用后面的替换前面的""" 275 """ 276 Return a translation table usable for str.translate(). 277 278 If there is only one argument, it must be a dictionary mapping Unicode 279 ordinals (integers) or characters to Unicode ordinals, strings or None. 280 Character keys will be then converted to ordinals. 281 If there are two arguments, they must be strings of equal length, and 282 in the resulting dictionary, each character in x will be mapped to the 283 character at the same position in y. If there is a third argument, it 284 must be a string, whose characters will be mapped to None in the result. 285 """ 286 pass 287 288 def partition(self, sep): # real signature unknown; restored from __doc__ 289 """从左边开始找到sep参数相同的字符串开始分割，（'xx','sep','xx'）""" 290 """ 291 S.partition(sep) -> (head, sep, tail) 292 293 Search for the separator sep in S, and return the part before it, 294 the separator itself, and the part after it. If the separator is not 295 found, return S and two empty strings. 296 """ 297 pass 298 299 def replace(self, old, new, count=None): # real signature unknown; restored from __doc__ 300 """用新的代替老的字符串""" 301 """ 302 S.replace(old, new[, count]) -> str 303 304 Return a copy of S with all occurrences of substring 305 old replaced by new. If the optional argument count is 306 given, only the first count occurrences are replaced. 307 """ 308 return "" 309 310 def rfind(self, sub, start=None, end=None): # real signature unknown; restored from __doc__ 311 """和find一样，但是从右边开始寻找""" 312 """ 313 S.rfind(sub[, start[, end]]) -> int 314 315 Return the highest index in S where substring sub is found, 316 such that sub is contained within S[start:end]. Optional 317 arguments start and end are interpreted as in slice notation. 318 319 Return -1 on failure. 320 """ 321 return 0 322 323 def rindex(self, sub, start=None, end=None): # real signature unknown; restored from __doc__ 324 """和index一样， 但是从右边开始寻找""" 325 """ 326 S.rindex(sub[, start[, end]]) -> int 327 328 Like S.rfind() but raise ValueError when the substring is not found. 329 """ 330 return 0 331 332 def rjust(self, width, fillchar=None): # real signature unknown; restored from __doc__ 333 """将字符串放在右边，用法和center一样""" 334 """ 335 S.rjust(width[, fillchar]) -> str 336 337 Return S right-justified in a string of length width. Padding is 338 done using the specified fill character (default is a space). 339 """ 340 return "" 341 342 def rpartition(self, sep): # real signature unknown; restored from __doc__ 343 """从右边开始找到sep参数相同的字符串开始分割，（'xx','sep','xx'）""" 344 """ 345 S.rpartition(sep) -> (head, sep, tail) 346 347 Search for the separator sep in S, starting at the end of S, and return 348 the part before it, the separator itself, and the part after it. If the 349 separator is not found, return two empty strings and S. 350 """ 351 pass 352 353 def rsplit(self, sep=None, maxsplit=-1): # real signature unknown; restored from __doc__ 354 """从右边开始找到sep参数相同的字符串开始分割，分割时去掉sep；maxsplit：代表找几次；（'xx','xx'）""" 355 """ 356 S.rsplit(sep=None, maxsplit=-1) -> list of strings 357 358 Return a list of the words in S, using sep as the 359 delimiter string, starting at the end of the string and 360 working to the front. If maxsplit is given, at most maxsplit 361 splits are done. If sep is not specified, any whitespace string 362 is a separator. 363 """ 364 return [] 365 366 def rstrip(self, chars=None): # real signature unknown; restored from __doc__ 367 """去除右边开始chars参数所代表的字符串（包括其子字符串可自由组合）,没有不去除（只有前一个去了后面才能去）， 368 不填默认去除多余空格还有（'\t','\]n'）；""" 369 """ 370 S.rstrip([chars]) -> str 371 372 Return a copy of the string S with trailing whitespace removed. 373 If chars is given and not None, remove characters in chars instead. 374 """ 375 return "" 376 377 def split(self, sep=None, maxsplit=-1): # real signature unknown; restored from __doc__ 378 """从左边开始找到sep参数相同的字符串开始分割，分割时去掉sep；maxsplit：代表找几次；（'xx','xx'）""" 379 """ 380 S.split(sep=None, maxsplit=-1) -> list of strings 381 382 Return a list of the words in S, using sep as the 383 delimiter string. If maxsplit is given, at most maxsplit 384 splits are done. If sep is not specified or is None, any 385 whitespace string is a separator and empty strings are 386 removed from the result. 387 """ 388 return [] 389 390 def splitlines(self, keepends=None): # real signature unknown; restored from __doc__ 391 """分割，按照'\n'分割，keepends：true保留换行符，false不保留换行符""" 392 """ 393 S.splitlines([keepends]) -> list of strings 394 395 Return a list of the lines in S, breaking at line boundaries. 396 Line breaks are not included in the resulting list unless keepends 397 is given and true. 398 """ 399 return [] 400 401 def startswith(self, prefix, start=None, end=None): # real signature unknown; restored from __doc__ 402 """判断是否以prefix参数开头 start:起始位置；end结束位置""" 403 """ 404 S.startswith(prefix[, start[, end]]) -> bool 405 406 Return True if S starts with the specified prefix, False otherwise. 407 With optional start, test S beginning at that position. 408 With optional end, stop comparing S at that position. 409 prefix can also be a tuple of strings to try. 410 """ 411 return False 412 413 def strip(self, chars=None): # real signature unknown; restored from __doc__ 414 """去除两边开始chars参数所代表的字符串（包括其子字符串可自由组合）,没有不去除（只有前一个去了后面才能去）， 415 不填默认去除多余空格还有（'\t','\]n'）；""" 416 """ 417 S.strip([chars]) -> str 418 419 Return a copy of the string S with leading and trailing 420 whitespace removed. 421 If chars is given and not None, remove characters in chars instead. 422 """ 423 return "" 424 425 def swapcase(self): # real signature unknown; restored from __doc__ 426 """大小写转换""" 427 """ 428 S.swapcase() -> str 429 430 Return a copy of S with uppercase characters converted to lowercase 431 and vice versa. 432 """ 433 return "" 434 435 def title(self): # real signature unknown; restored from __doc__ 436 """将字符串转换成标题形式""" 437 """ 438 S.title() -> str 439 440 Return a titlecased version of S, i.e. words start with title case 441 characters, all remaining cased characters have lower case. 442 """ 443 return "" 444 445 def translate(self, table): # real signature unknown; restored from __doc__ 446 """按照table参数表示的一一对应关系替换 变量中的值 ，返回替换后的字符串""" 447 """ 448 S.translate(table) -> str 449 450 Return a copy of the string S in which each character has been mapped 451 through the given translation table. The table must implement 452 lookup/indexing via __getitem__, for instance a dictionary or list, 453 mapping Unicode ordinals to Unicode ordinals, strings, or None. If 454 this operation raises LookupError, the character is left untouched. 455 Characters mapped to None are deleted. 456 """ 457 return "" 458 459 def upper(self): # real signature unknown; restored from __doc__ 460 """将字符串中字母全部变成大写""" 461 """ 462 S.upper() -> str 463 464 Return a copy of S converted to uppercase. 465 """ 466 return "" 467 468 def zfill(self, width): # real signature unknown; restored from __doc__ 469 """将字符串放在右边和 width：代表宽度 ；默认用0填充""" 470 """ 471 S.zfill(width) -> str 472 473 Pad a numeric string S with zeros on the left, to fill a field 474 of the specified width. The string S is never truncated. 475 """ 476 return ""
1. 索引，切片：字符串可以用索引：a = "abc" b = a[0] 切片：a = "abcdef" b = a[0:2] (取第0 1 个，2为-1时就是到最后)
2. len()：a = len("中") 在Python3中输出a=1,字符串长度; Python2中输出a=3 ，字节长度
3. 还支持for循环如 ：for b in a:
4. 字符串一旦创建不可修改，修改和拼接都是产生的新的字符串
列表：list
（list型所有功能都在 int 里面，在Pychram中建立文件输入list，按住Crtl鼠标点击list 进入查看）
1 class list(object): 2 """ 3 list() -> new empty list 4 list(iterable) -> new list initialized from iterable's items 5 """ 6 def append(self, p_object): # real signature unknown; restored from __doc__ 7 """在元素当成整体后面追加字符串""" 8 """ L.append(object) -> None -- append object to end """ 9 pass 10 11 def clear(self): # real signature unknown; restored from __doc__ 12 """清空列表""" 13 """ L.clear() -> None -- remove all items from L """ 14 pass 15 16 def copy(self): # real signature unknown; restored from __doc__ 17 """拷贝 浅拷贝""" 18 """ L.copy() -> list -- a shallow copy of L """ 19 return [] 20 21 def count(self, value): # real signature unknown; restored from __doc__ 22 """计算出元素出现的次数""" 23 """ L.count(value) -> integer -- return number of occurrences of value """ 24 return 0 25 26 def extend(self, iterable): # real signature unknown; restored from __doc__ 27 """将每个元素元素追加到后面 参数要是可迭代对象""" 28 """ L.extend(iterable) -> None -- extend list by appending elements from the iterable """ 29 pass 30 31 def index(self, value, start=None, stop=None): # real signature unknown; restored from __doc__ 32 """找元素的位置 左边优先""" 33 """ 34 L.index(value, [start, [stop]]) -> integer -- return first index of value. 35 Raises ValueError if the value is not present. 36 """ 37 return 0 38 39 def insert(self, index, p_object): # real signature unknown; restored from __doc__ 40 """插入元素；index：要插入值的位置；p_object要插入的值""" 41 """ L.insert(index, object) -- insert object before index """ 42 pass 43 44 def pop(self, index=None): # real signature unknown; restored from __doc__ 45 """删除某个值返回被删除的值；index：要删除的值的索引；默认情况下删除最后一个""" 46 """ 47 L.pop([index]) -> item -- remove and return item at index (default last). 48 Raises IndexError if list is empty or index is out of range. 49 """ 50 pass 51 52 def remove(self, value): # real signature unknown; restored from __doc__ 53 """删除；value：要删除的元素""" 54 """ 55 L.remove(value) -> None -- remove first occurrence of value. 56 Raises ValueError if the value is not present. 57 """ 58 pass 59 60 def reverse(self): # real signature unknown; restored from __doc__ 61 """当前列表进行反转""" 62 """ L.reverse() -- reverse *IN PLACE* """ 63 pass 64 65 def sort(self, key=None, reverse=False): # real signature unknown; restored from __doc__ 66 """帮忙排序；reverse=true 从大到小，reverse=false 从小到大""" 67 """ L.sort(key=None, reverse=False) -> None -- stable sort *IN PLACE* """ 68 pass
1. 中括号括起来，用 , 分割元素
2. 列表中可以是数字，字符串，列表 ， 布尔值 ，元组，字典
3. 支持索引分割for,while, 可迭代
4. 可以被修改 通过索引和切片，
5. 可以通过索引和切片删除如 del(a[i])
6. 列表换成字符转，如果没有数字直接用字符串的join函数，有数字就只能通过for循环
元组：tuple
（tuple型所有功能都在 tuple 里面，在Pychram中建立文件输入list，按住Crtl鼠标点击tuple 进入查看）
1 class tuple(object): 2 """ 3 tuple() -> empty tuple 4 tuple(iterable) -> tuple initialized from iterable's items 5 6 If the argument is a tuple, the return value is the same object. 7 """ 8 def count(self, value): # real signature unknown; restored from __doc__ 9 """计算出元素的个数""" 10 """ T.count(value) -> integer -- return number of occurrences of value """ 11 return 0 12 13 def index(self, value, start=None, stop=None): # real signature unknown; restored from __doc__ 14 """索引出元素所在位置； value：索引的值；start：起始位置；stop：结束位置""" 15 """ 16 T.index(value, [start, [stop]]) -> integer -- return first index of value. 17 Raises ValueError if the value is not present. 18 """ 19 return 0
1. 元组用()括起来 ，一般写元组的时候在后面加个 ,
2. 元组的元素（一级元素）不可修改，不能被增加或者删除，但是如果元组里面的元素的元素如果是可修改类型就可以修改
3. 一般写元素的时候推荐在最好加入
4. 可以被索引，切片，for循环，是可迭代对象
字典：dict
（dict型所有功能都在 dict 里面，在Pychram中建立文件输入dict，按住Crtl鼠标点击dict 进入查看）
1 class dict(object): 2 """ 3 dict() -> new empty dictionary 4 dict(mapping) -> new dictionary initialized from a mapping object's 5 (key, value) pairs 6 dict(iterable) -> new dictionary initialized as if via: 7 d = {} 8 for k, v in iterable: 9 d[k] = v 10 dict(**kwargs) -> new dictionary initialized with the name=value pairs 11 in the keyword argument list. For example: dict(one=1, two=2) 12 """ 13 def clear(self): # real signature unknown; restored from __doc__ 14 """清空字典中的元素""" 15 """ D.clear() -> None. Remove all items from D. """ 16 pass 17 18 def copy(self): # real signature unknown; restored from __doc__ 19 """浅拷贝""" 20 """ D.copy() -> a shallow copy of D """ 21 pass 22 23 @staticmethod # known case 支持类名加方法 如 dict.fromkeys 24 def fromkeys(*args, **kwargs): # real signature unknown 25 """根据序列创建一个字典 args：中间的元素当成key ； kwargs：中的元素当成value""" 26 """ Returns a new dict with keys from iterable and values equal to value. """ 27 pass 28 29 def get(self, k, d=None): # real signature unknown; restored from __doc__ 30 """根据key取字典中的值；不存在时可以指定默认值（NOLL）""" 31 """ D.get(k[,d]) -> D[k] if k in D, else d. d defaults to None. """ 32 pass 33 34 def items(self): # real signature unknown; restored from __doc__ 35 """获取键值对""" 36 """ D.items() -> a set-like object providing a view on D's items """ 37 pass 38 39 def keys(self): # real signature unknown; restored from __doc__ 40 """获取key值""" 41 """ D.keys() -> a set-like object providing a view on D's keys """ 42 pass 43 44 def pop(self, k, d=None): # real signature unknown; restored from __doc__ 45 """删除键值对；k：想要删除的键值对；返回为删除的值；d:如果不存在时返回值""" 46 """ 47 D.pop(k[,d]) -> v, remove specified key and return the corresponding value. 48 If key is not found, d is returned if given, otherwise KeyError is raised 49 """ 50 pass 51 52 def popitem(self): # real signature unknown; restored from __doc__ 53 """随机删除键值对；返回删除的键值对""" 54 """ 55 D.popitem() -> (k, v), remove and return some (key, value) pair as a 56 2-tuple; but raise KeyError if D is empty. 57 """ 58 pass 59 60 def setdefault(self, k, d=None): # real signature unknown; restored from __doc__ 61 """设置值；如果存在不设置获取当前key对应的值，如果不存在添加，获取当前设置的值""" 62 """ D.setdefault(k[,d]) -> D.get(k,d), also set D[k]=d if k not in D """ 63 pass 64 65 def update(self, E=None, **F): # known special case of dict.update 66 """更新字典里面上值""" 67 """ 68 D.update([E, ]**F) -> None. Update D from dict/iterable E and F. 69 If E is present and has a .keys() method, then does: for k in E: D[k] = E[k] 70 If E is present and lacks a .keys() method, then does: for k, v in E: D[k] = v 71 In either case, this is followed by: for k in F: D[k] = F[k] 72 """ 73 pass 74 75 def values(self): # real signature unknown; restored from __doc__ 76 """获取字典中的元素""" 77 """ D.values() -> an object providing a view on D's values """ 78 pass
1. 字典的格式 key值不能是可变值 bool值不能和（0，1）一起出现
dic = { 2 : 1, "key" : "abc", True : (1,2,3), (1,2) : { 1 : 1, "key" : "abc", True : (1,2,3), } }
2. 字典是无序的，不能进行切片
3. 字典里面可以嵌套任意元素类型
4. 可以通过索引的方式找到里面的元素
5. 支持删除和for循环
布尔值：bool
1. 只有0 ，1
2. None，''，()，[]，{}，0 =====>代表False
