python 學習筆記3------概述3
阿新 • • 發佈:2019-01-24
1、python物件3個屬性:身份(id()獲取),型別(type()獲取),值
2、物件值的比較和物件身份的比較:前者就不說了,後者用is或is not,表示兩個變數是否實質為同一個物件的引用。
3、檢查型別
#!/usr/bin/env python def displayNumType(num): print num, 'is', if isinstance(num, (int, long, float, complex)): print 'a number of type:', type(num).__name__ else: print 'not a number at all!!' import types def displayNumType2(num): print num, 'is a number of type: ', if type(num) == types.IntType: print types.IntType elif type(num) == types.StringType: print types.StringType elif type(num) == types.FloatType: print types.FloatType elif type(num) == types.ComplexType: print types.ComplexType elif type(num) == types.LongType: print types.LongType else: print 'not a number at all!!' displayNumType(-69) displayNumType(9999999999999999999999L) displayNumType(98.6) displayNumType(-5.2+1.9j) displayNumType('xxx') print '===========================================' displayNumType2(-69) displayNumType2(9999999999999999999999L) displayNumType2(98.6) displayNumType2(-5.2+1.9j) displayNumType2('xxx')
4、內建函式總結