哪位大神总结一下help的用法？解决方案

>>> help(open)
Help on built-in function open in module __builtin__:

open(...)
    open(name[, mode[, buffering]]) -> file object
    
    Open a file using the file() type, returns a file object.  This is the
    preferred way to open a file.  See file.__doc__ for further information.

>>> help(os)
Help on module os:[About 1242 more lines. Double-click to unfold]
>>> a = "a string"
>>> help(a)
no Python documentation found for 'a string'

>>> help(a.endswith)
Help on built-in function endswith:

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.

------解决方案--------------------

安装目录doc目录下。。。。。。