Python有用的工具

1、type：可用来确定对象属于哪种数据类型

type("123456")

 结果：<class 'str'>

type([123456,22])

结果：<class 'list'>

 

2、dir：可列出指定类型内置的方法与属性列表

# 查看字符串内置的方法与属性列表
type("123456")

结果：

['__add__', '__class__', '__contains__', '__delattr__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__getnewargs__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__iter__', '__le__', '__len__', '__lt__', '__mod__', '__mul__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__rmod__', '__rmul__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', 'capitalize', 'casefold', 'center', 'count', 'encode', 'endswith', 'expandtabs', 'find', 'format', 'format_map', 'index', 'isalnum', 'isalpha', 'isascii', 'isdecimal', 'isdigit', 'isidentifier', 'islower', 'isnumeric', 'isprintable', 'isspace', 'istitle', 'isupper', 'join', 'ljust', 'lower', 'lstrip', 'maketrans', 'partition', 'replace', 'rfind', 'rindex', 'rjust', 'rpartition', 'rsplit', 'rstrip', 'split', 'splitlines', 'startswith', 'strip', 'swapcase', 'title', 'translate', 'upper', 'zfill']

 

# 查看列表内置的方法与属性列表
dir(["abc"]

结果：

['__add__', '__class__', '__contains__', '__delattr__', '__delitem__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__gt__', '__hash__', '__iadd__', '__imul__', '__init__', '__init_subclass__', '__iter__', '__le__', '__len__', '__lt__', '__mul__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__reversed__', '__rmul__', '__setattr__', '__setitem__', '__sizeof__', '__str__', '__subclasshook__', 'append', 'clear', 'copy', 'count', 'extend', 'index', 'insert', 'pop', 'remove', 'reverse', 'sort']

 

3、help：获取指定对象、方法、或模块的帮助文档信息

# 查看split方法的帮助文档，方法名不需要加括号
help(" ".split)

结果：

Help on built-in function split:

split(sep=None, maxsplit=-1) method of builtins.str instance
　　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.