Python中的標識運算子

Python中的標識運算子

 　　這篇文章主要介紹了講解Python中的標識運算子,是Python學習當中的基礎知識,需要的朋友可以參考下

　　下表列出了所有Python語言支援的標識運算子。

　　樣本：

　　試試下面的例子就明白了所有Python程式設計語言提供的標識運算子：

　　?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

#!/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"

　　當執行上面的程式它會產生以下結果：

　　?

1 2 3 4

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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