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余吟21607

#1 Created at ... [Delete] [Delete and Lock User] 
L2 = [m.lower() for m in L1 if isinstance(m, str)]  # 不输出字符串以外的

L2 = [m.lower() if isinstance(m, str) else m for m in L1]   # 这样不行么，数字以及其他类型不进行转换

落落96897

#2 Created at ... [Delete] [Delete and Lock User]

if 放在前面是表达式，if else一定会有一个结果  ，else m其实已经在进行转换进行输出了，所以会报错

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