wen Python help 函数 – Python零基础入门教程
目录
- 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__ = 368
None
Process 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
-10
Process finished with exit code 0
"""
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