map 用法很简单，只是 python3 和 python2 有点不同
python2
map(str, range(3)) # ['0', '1', '2']
python3
a = map(str, range(3)) print(a) # <map object at 0x0000000003663288> b = list(a) print(b) # ['0', '1', '2']
map 用法很简单，只是 python3 和 python2 有点不同
python2
map(str, range(3)) # ['0', '1', '2']
python3
a = map(str, range(3)) print(a) # <map object at 0x0000000003663288> b = list(a) print(b) # ['0', '1', '2']