a = [21, 2.5 , -23.2, 8.4, -4, 3, -1.03]
收起
a = [21, 2.5 , -23.2, 8.4, -4, 3, -1.03] #遍历列表 for i in range(len(a)): if a[i]<0: #发现负数元素就取反 a[i] = -a[i] print(a)
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