为什么list没有像字典一样安全的"get“方法?
>>> d = {'a':'b'} >>> d['a'] 'b' >>> d['c'] KeyError: 'c' >>> d.get('c', 'fail') 'fail' >>> l = [1] >>> l[10] IndexError: list index out of range
https://stackoverflow.com/questions/5125619
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