例如：

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'.

"""

其中一個函數

def capitalize(self): # real signature unknown; restored from __doc__

"""

S.capitalize() -> str

Return a capitalized version of S, i.e. make the first character

have upper case and the rest lower case.

"""

return ""

這個函數到底返回了什么？難道返回了一個空字符嗎？

def endswith(self, suffix, start=None, end=None): # real signature unknown; restored from __doc__

"""

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.

"""

return False

這個函數，返回False ，什么意思？

def find(self, sub, start=None, end=None): # real signature unknown; restored from __doc__

"""

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.

"""

return 0

這個返回一個0 ？

def format(self, *args, **kwargs): # known special case of str.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 '}').

"""

pass

這個是一pass結尾的，那么要這個函數有什么意義

但是我在實際應用他們的時候，返回的并不是這樣的？

我現在的以為是：這個類里面的這些函數，函數體里面什么邏輯都沒有寫？那么函數是怎么運行的？

總結

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