任何人都可以解释如何x取整数值.我们直接x在for循环中使用"for x in a"编译器如何识别它x代表列表中的字符串?
>>> # Measure some strings:
... a = ['cat', 'window', 'defenestrate']
>>> for x in a:
... print x, len(x)
...
cat 3
window 6
defenestrate 12
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