可以使用列表推导来完成。这些基本上采取的形式[function-of-item for item in some- list]
。例如,要创建一个新列表,其中所有项目均为小写(或在第二个片段中为大写),则可以使用:
>>> [x.lower() for x in ["A","B","C"]]
['a', 'b', 'c']
>>> [x.upper() for x in ["a","b","c"]]
['A', 'B', 'C']
您还可以使用以下map
功能:
>>> map(lambda x:x.lower(),["A","B","C"])
['a', 'b', 'c']
>>> map(lambda x:x.upper(),["a","b","c"])
['A', 'B', 'C']