武汉理工大学研究生复试分数线,皮毛市场,高等数学竞赛
下表列出了所有python语言支持的标识运算符。
示例:
试试下面的例子就明白了所有python编程语言提供的标识运算符:
#!/usr/bin/python a = 20 b = 20 if ( 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 = 30 if ( 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"
当执行上面的程序它会产生以下结果:
line 1 - a and b have same identity line 2 - a and b have same identity line 3 - a and b do not have same identity line 4 - a and b do not have same identity
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