ret = map(abs,[-1,1,2,3])
print(ret)
for i in ret:
print(i)
l = [1,-2,3,6,8,-7]
l.sort(key=abs)
print(l)
ret = map(abs,[-1,1,2,3])
print(ret)
for i i
阅读背景：
内置函数-map
来源：互联网
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