Python在字符串中的字符之间添加空格.最有效的方式

Question

说我有一个字符串s = 'BINGO'; 我想迭代字符串来生成'B I N G O'.

这就是我做的:

result = ''
for ch in s:
   result = result + ch + ' '
print(result[:-1])    # to rid of space after O

有没有更有效的方法来解决这个问题？

Answer 1

s = "BINGO"
print(" ".join(s))

应该这样做.

Answer 2

s = "BINGO"
print(s.replace("", " ")[1: -1])

时间如下

$ python -m timeit -s's = "BINGO"' 's.replace(""," ")[1:-1]'
1000000 loops, best of 3: 0.584 usec per loop
$ python -m timeit -s's = "BINGO"' '" ".join(s)'
100000 loops, best of 3: 1.54 usec per loop