a = 'hello'
b = None
c = None
for x in [a, b, c]:
if isinstance(x, (basestring, dict, int, float)) or x is None:
x = [x]
a
a = 'hello'
b = None
c = None
for x in [a, b, c
阅读背景：
Python：为什么这段代码失败了？将变量分配给for循环中的自身列表
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