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Python帮助源是指Python解释器内置的文档和函数，用于提供有关Python语言本身和标准库的信息和说明。它可以在Python解释器中通过调用help()函数来访问。

help()函数接受一个参数，该参数可以是任何Python对象，例如模块、类或函数。它将显示与该对象相关的文档字符串和其他相关信息。如果没有传递参数，则会进入交互式帮助会话。

以下是一些使用help()函数的示例：

1. 查看str.split()函数的文档：


>>> help(str.split)
Help on method_descriptor:

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

Splits are done starting at the beginning of the string and working towards the end.


2. 查看list类型的文档：


>>> help(list)
Help on class list in module builtins:

class list(object)
| list(iterable=(), /)
|
| Built-in mutable sequence.
|
| If no argument is given, the constructor creates a new empty list.
| The argument must be an iterable if specified.
|
| Methods defined here:
|
| __add__(self, value, /)
| Return self+value.
...


3. 进入交互式帮助会话：


>>> help()
Welcome to Python 3.9's help utility!

If this is your first time using Python, you should definitely check out
the tutorial on the Internet at https://docs.python.org/3.9/tutorial/.

Enter the name of any module, keyword, or topic to get help on writing
Python programs and using Python modules. To quit this help utility and
return to the interpreter, just type "quit".

To get a list of available modules, keywords, symbols, or topics, type
"modules", "keywords", "symbols", or "topics". Each module also comes
with a one-line summary of what it does; to list the modules whose name
or summary contain a given string such as "spam", type "modules spam".