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a = [1,2,3,4]
b = [1,2]
b in a ·µ»ØÊÇFALSE°¡£¬
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在 07-9-2，张迪(jondy)<jondynet在gmail.com> 写道：
> 比如
> a = [1,2,3,4]
> b = [1,2]
> b in a 返回是FALSE啊，
> 为何，该如何判断，谢谢

b是个list，本来就不in a啊

>>> a = [[1, 2], [3, 4]]
>>> b = [1, 2]
>>> b in a
True

>>> def jondy(a,b):
...     for i in a:
...         if not i in b:
...             return False
...     return True
...
>>> a = [1,2,3,4]
>>> b = [1,2]
>>> jondy(b, a)
True
>>> jondy(a, b)
False


在 07-9-2，张迪(jondy)<jondynet at gmail.com> 写道：
> 比如
> a = [1,2,3,4]
> b = [1,2]
> b in a 返回是FALSE啊，
> 为何，该如何判断，谢谢

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From: python-chinese-bounces在lists.python.cn
[mailto:python-chinese-bounces在lists.python.cn] On Behalf Of ÕŵÏ(jondy)
Sent: Sunday, September 02, 2007 2:56 AM
To: python-chinese
Subject: [python-chinese] ÈçºÎÅжÏÒ»¸öÁбí°üº¬ÁíÒ»¸öÁбí

 

±ÈÈç

a = [1,2,3,4]

b = [1,2]

b in a ·µ»ØÊÇFALSE°¡£¬

ΪºÎ£¬¸ÃÈçºÎÅжϣ¬Ð»Ð»

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> 比如
>
> a = [1,2,3,4]
>
> b = [1,2]
>
> b in a 返回是FALSE啊，
>
> 为何，该如何判断，谢谢
>
只有a=[[1, 2], 3, 4]的时候，b in a 才会返回TRUE吧？