L2 = [x.lower() for x in L1 if isinstance(x, str)]
这其实是一个语法糖,可以等同如下源码:
def generate(L): result = [] for x in L: if isinstance(x, str): result.append(x.lower()) return result
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menfrexu
这其实是一个语法糖,可以等同如下源码: