L2 = [] for x in L1: if isinstance(x,str) == True: L2.append(x)
L2 = [s.lower() for s in L2]
#法二
#[x.lower() for x in L1 if not isinstance(x,int) if x != None]
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ferb2015
L2 = [] for x in L1: if isinstance(x,str) == True: L2.append(x)
L2 = [s.lower() for s in L2]
#法二
#[x.lower() for x in L1 if not isinstance(x,int) if x != None]