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Why do list comprehensions write to the loop variable,but generators don’t? 6个
需要帮助解释为什么此代码段不会像我期望的那样返回
需要帮助解释为什么此代码段不会像我期望的那样返回
>>> a = 1 >>> v = ["a","b","c"] >>> {e for e in v if locals().get(e) is None} set(['a','c','b'])
我希望它返回set([‘c’,’b’]),就像我建立一个列表一样
>>> [e for e in v if locals().get(e) is None] ['b','c']