Python help 函数 - Python零基础入门教程

一.Python help 函数简介
二.Python help 函数使用
- 1.查看内置函数的帮助信息
- 2.查看数据类型的帮助信息
三.猜你喜欢

基础 Python 学习路线推荐 : Python 学习目录 >> Python 基础入门

Python 3.x 版本虽然比 2.x 少了一些内置函数，但是 **Python 内置 **函数没有 60 个，也有 40 个，那么多内置函数你记得过来吗？为了方便使用，Python 提供了help 函数专门用来提供查看函数或模块用途的详细说明；

一.Python help 函数简介

'''
参数：object – 对象/函数名/模块；返回值 – 返回对象的帮助信息；
'''
help([object])

二.Python help 函数使用

1.查看内置函数的帮助信息

# !usr/bin/env python
# !usr/bin/env python
# -*- coding:utf-8 _*-
"""
@Author:猿说编程
@Blog(个人博客地址): www.codersrc.com
@File:Python help 函数.py
@Time:2021/05/11 07:37
@Motto:不积跬步无以至千里，不积小流无以成江海，程序人生的精彩需要坚持不懈地积累！"""print(help(type)) # 内置函数type  - 获取数据变量类型'''
输出结果：Help on class type in module builtins:class type(object)|  type(object_or_name, bases, dict)|  type(object) -> the object's type|  type(name, bases, dict) -> a new type||  Methods defined here:||  __call__(self, /, *args, **kwargs)|      Call self as a function.||  __delattr__(self, name, /)|      Implement delattr(self, name).||  __dir__(...)|      __dir__() -> list|      specialized __dir__ implementation for types||  __getattribute__(self, name, /)|      Return getattr(self, name).||  __init__(self, /, *args, **kwargs)|      Initialize self.  See help(type(self)) for accurate signature.||  __instancecheck__(...)|      __instancecheck__() -> bool|      check if an object is an instance||  __new__(*args, **kwargs)|      Create and return a new object.  See help(type) for accurate signature.||  __prepare__(...)|      __prepare__() -> dict|      used to create the namespace for the class statement||  __repr__(self, /)|      Return repr(self).||  __setattr__(self, name, value, /)|      Implement setattr(self, name, value).||  __sizeof__(...)|      __sizeof__() -> int|      return memory consumption of the type object||  __subclasscheck__(...)|      __subclasscheck__() -> bool|      check if a class is a subclass||  __subclasses__(...)|      __subclasses__() -> list of immediate subclasses||  mro(...)|      mro() -> list|      return a type's method resolution order||  ----------------------------------------------------------------------|  Data descriptors defined here:||  __abstractmethods__||  __dict__||  __text_signature__||  ----------------------------------------------------------------------|  Data and other attributes defined here:||  __base__ = <class 'object'>|      The most base type||  __bases__ = (<class 'object'>,)||  __basicsize__ = 864||  __dictoffset__ = 264||  __flags__ = -2146675712||  __itemsize__ = 40||  __mro__ = (<class 'type'>, <class 'object'>)||  __weakrefoffset__ = 368NoneProcess finished with exit code 0
'''

2.查看数据类型的帮助信息

# !usr/bin/env python
# !usr/bin/env python
# -*- coding:utf-8 _*-
"""
@Author:猿说编程
@Blog(个人博客地址): www.codersrc.com
@File:Python help 函数.py
@Time:2021/05/11 07:37
@Motto:不积跬步无以至千里，不积小流无以成江海，程序人生的精彩需要坚持不懈地积累！"""print(help(str))  # 内置数据变量类型 - 字符'''
输出结果：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__(...)|      S.__format__(format_spec) -> str||      Return a formatted version of S 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.n||  __ne__(self, value, /)|      Return self!=value.||  __new__(*args, **kwargs) from builtins.type|      Create and return a new object.  See help(type) for accurate signature.||  __repr__(self, /)|      Return repr(self).||  __rmod__(self, value, /)|      Return value%self.||  __rmul__(self, value, /)|      Return self*value.||  __sizeof__(...)|      S.__sizeof__() -> size of S in memory, in bytes||  __str__(self, /)|      Return str(self).||  capitalize(...)|      S.capitalize() -> str||      Return a capitalized version of S, i.e. make the first character|      have upper case and the rest lower case.||  casefold(...)|      S.casefold() -> str||      Return a version of S suitable for caseless comparisons.||  center(...)|      S.center(width[, fillchar]) -> str||      Return S centered in a 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(...)|      S.encode(encoding='utf-8', errors='strict') -> bytes||      Encode S using the codec registered for encoding. Default encoding|      is 'utf-8'. errors may be given to set a different error|      handling scheme. 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(...)|      S.expandtabs(tabsize=8) -> str||      Return a copy of S 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(...)|      S.isalnum() -> bool||      Return True if all characters in S are alphanumeric|      and there is at least one character in S, False otherwise.||  isalpha(...)|      S.isalpha() -> bool||      Return True if all characters in S are alphabetic|      and there is at least one character in S, False otherwise.||  isdecimal(...)|      S.isdecimal() -> bool||      Return True if there are only decimal characters in S,|      False otherwise.||  isdigit(...)|      S.isdigit() -> bool||      Return True if all characters in S are digits|      and there is at least one character in S, False otherwise.||  isidentifier(...)|      S.isidentifier() -> bool||      Return True if S is a valid identifier according|      to the language definition.||      Use keyword.iskeyword() to test for reserved identifiers|      such as "def" and "class".||  islower(...)|      S.islower() -> bool||      Return True if all cased characters in S are lowercase and there is|      at least one cased character in S, False otherwise.||  isnumeric(...)|      S.isnumeric() -> bool||      Return True if there are only numeric characters in S,|      False otherwise.||  isprintable(...)|      S.isprintable() -> bool||      Return True if all characters in S are considered|      printable in repr() or S is empty, False otherwise.||  isspace(...)|      S.isspace() -> bool||      Return True if all characters in S are whitespace|      and there is at least one character in S, False otherwise.||  istitle(...)|      S.istitle() -> bool||      Return True if S is a titlecased string and there is at least one|      character in S, i.e. upper- and titlecase characters may only|      follow uncased characters and lowercase characters only cased ones.|      Return False otherwise.||  isupper(...)|      S.isupper() -> bool||      Return True if all cased characters in S are uppercase and there is|      at least one cased character in S, False otherwise.||  join(...)|      S.join(iterable) -> str||      Return a string which is the concatenation of the strings in the|      iterable.  The separator between elements is S.||  ljust(...)|      S.ljust(width[, fillchar]) -> str||      Return S left-justified in a Unicode string of length width. Padding is|      done using the specified fill character (default is a space).||  lower(...)|      S.lower() -> str||      Return a copy of the string S converted to lowercase.||  lstrip(...)|      S.lstrip([chars]) -> str||      Return a copy of the string S with leading whitespace removed.|      If chars is given and not None, remove characters in chars instead.||  partition(...)|      S.partition(sep) -> (head, sep, tail)||      Search for the separator sep in S, and return the part before it,|      the separator itself, and the part after it.  If the separator is not|      found, return S and two empty strings.||  replace(...)|      S.replace(old, new[, count]) -> str||      Return a copy of S with all occurrences of substring|      old replaced by new.  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(...)|      S.rjust(width[, fillchar]) -> str||      Return S right-justified in a string of length width. Padding is|      done using the specified fill character (default is a space).||  rpartition(...)|      S.rpartition(sep) -> (head, sep, tail)||      Search for the separator sep in S, starting at the end of S, and return|      the part before it, the separator itself, and the part after it.  If the|      separator is not found, return two empty strings and S.||  rsplit(...)|      S.rsplit(sep=None, maxsplit=-1) -> list of strings||      Return a list of the words in S, using sep as the|      delimiter string, starting at the end of the string and|      working to the front.  If maxsplit is given, at most maxsplit|      splits are done. If sep is not specified, any whitespace string|      is a separator.||  rstrip(...)|      S.rstrip([chars]) -> str||      Return a copy of the string S with trailing whitespace removed.|      If chars is given and not None, remove characters in chars instead.||  split(...)|      S.split(sep=None, maxsplit=-1) -> list of strings||      Return a list of the words in S, using sep as the|      delimiter string.  If maxsplit is given, at most maxsplit|      splits are done. If sep is not specified or is None, any|      whitespace string is a separator and empty strings are|      removed from the result.||  splitlines(...)|      S.splitlines([keepends]) -> list of strings||      Return a list of the lines in S, 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(...)|      S.strip([chars]) -> str||      Return a copy of the string S with leading and trailing|      whitespace removed.|      If chars is given and not None, remove characters in chars instead.||  swapcase(...)|      S.swapcase() -> str||      Return a copy of S with uppercase characters converted to lowercase|      and vice versa.||  title(...)|      S.title() -> str||      Return a titlecased version of S, i.e. words start with title case|      characters, all remaining cased characters have lower case.||  translate(...)|      S.translate(table) -> str||      Return a copy of the string S in which each character has been mapped|      through the given translation table. The table must implement|      lookup/indexing via __getitem__, for instance a dictionary or list,|      mapping Unicode ordinals to Unicode ordinals, strings, or None. If|      this operation raises LookupError, the character is left untouched.|      Characters mapped to None are deleted.||  upper(...)|      S.upper() -> str||      Return a copy of S converted to uppercase.||  zfill(...)|      S.zfill(width) -> str||      Pad a numeric string S with zeros on the left, to fill a field|      of the specified width. The string S is never truncated.||  ----------------------------------------------------------------------|  Static methods defined here:||  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.None
-10Process finished with exit code 0
'''