python函数中文手册.docx

This abstract type is the superclass for str and unicode. It cannot be called or instantiated,

but it can be used to test whether an object is an instance of str or unicode. isinstance(obj,

Convert an integer number to a binary string. The result is a valid Python expression. If is

not a Python int object, it has to define an __index__() method that returns an integer.

are callable (calling a class returns a new instance); class instances are callable if they have a

Return a string of one character whose ASCII code is the integer . For example, chr(97)

returns the string 'a'. This is the inverse oford(). The argument must be in the range [0..255],

receives the instance. To declare a class method, use this idiom:

The return value is negative if x < y, zero if x == y and strictly positive if x > y.

X 小于 X 输出负（-1），X 等于 Y 输出零（0），X 大于 Y 输出正（1）

用法：