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python里的三目运算
source link: https://www.linuxzen.com/pythonli-de-san-mu-yun-suan.html
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下面说的和三目运算有点相似,但又不一样,实在不知道该如何拟定标题,先就是这个标题吧,大家都知道python中没有三目运算,但是and/or有点类似三目运算:
and/or
单独使用表示逻辑关系与和或,也可以组和使用,用法如下
and前后如果某一个值为假(False, '', [], {}, None…)则返回第一个假值 如果所有值都为真则返回最后一个真值
如果or任意一个值为真,则立刻返回这个值 如果所有值都为假,则or返回最后一个假值
result = 'test' and True # result = True
result = 'test' and 'ortest' # result = ortest
result = False and 'ortest' # result = False
result = '' and None # result = ''
result = '' or "Hall" # result = Hall
result = False or None # result = None
result = 'test' or 'nottest' # result = test
使用单行if else 模拟三目运算
result if True / False else fresult if为真时候结果为result,为假的时候结果为fresult
result = 'test' if True else 'not test' # result = 'test'
result = 'test' if False else 'not test' # result = 'not test'
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