请问python身份运算符如何使用

Question

请问python身份运算符如何使用

Answer 1

Python身份运算符身份运算符用于比较两个对象的存储单元以下实例演示了Python所有身份运算符的操作：#!/usr/bin/pythona = 20b = 20if ( a is b ):print "Line 1 - a and b have same identity"else:print "Line 1 - a and b do not have same identity"if ( id(a) == id(b) ):print "Line 2 - a and b have same identity"else:print "Line 2 - a and b do not have same identity"b = 30if ( a is b ):print "Line 3 - a and b have same identity"else:print "Line 3 - a and b do not have same identity"if ( a is not b ):print "Line 4 - a and b do not have same identity"else:print "Line 4 - a and b have same identity"以上实例输出结果：Line 1 - a and b have same identityLine 2 - a and b have same identityLine 3 - a and b do not have same identityLine 4 - a and b do not have same identity

Answer 2

12345>>>&nbsp;10&nbsp;<<&nbsp;120>>>&nbsp;10&nbsp;>>&nbsp;15>>>&nbsp;<<是按位左移，>>是按位右移。移一位的时候，等同于*2, /2.&nbsp;

Answer 3

左移运算是将一个二进制位的操作数按指定移动的位数向左移位，移出位被丢弃，右边的空位一律补0。右移运算是将一个二进制位的操作数按指定移动的位数向右移动，移出位被丢弃，左边移出的空位或者一律补0，或者补符号位，这由不同的机器而定。用起来是这样的123456789101112>>>&nbsp;3<<16>>>&nbsp;1<<12>>>&nbsp;2<<14>>>&nbsp;2<<14>>>&nbsp;4<<18>>>&nbsp;5<<110&nbsp;