Python help() 内置函数
来自 Python 3 文档
调用内置的帮助系统。（此函数旨在供交互式使用。）如果未给出参数，则在解释器控制台上启动交互式帮助系统。如果参数是一个字符串，则该字符串被查找为模块、函数、类、方法、关键字或文档主题的名称，并在控制台上打印帮助页面。
简介
Python 中的 help() 函数是一个内置工具，可用于访问 Python 丰富的帮助系统。它对于交互式探索和学习特别有用，因为它允许您直接在 Python 解释器中获取有关模块、函数、类和关键字的文档。当不带参数调用时，它会启动一个交互式帮助会话；否则，它会打印给定对象的帮助信息。
示例
help(type)
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__(self, /)
| Specialized __dir__ implementation for types.
|
| __getattribute__(self, name, /)
:
help(str)
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:
:
help(help)
Help on _Helper in module _sitebuiltins object:
class _Helper(builtins.object)
| Define the builtin 'help'.
|
| This is a wrapper around pydoc.help that provides a helpful message
| when 'help' is typed at the Python interactive prompt.
|
| Calling help() at the Python prompt starts an interactive help session.
| Calling help(thing) prints help for the python object 'thing'.
|
| Methods defined here:
|
| __call__(self, *args, **kwds)
| Call self as a function.
: