python中有一个zfill方法用来给字符串前面补0,非常有用
n = "123" |
s = n.zfill( 5 ) |
assert s = = "00123" |
zfill()也可以给负数补0
n = "-123" |
s = n.zfill( 5 ) |
assert s = = "-0123" |
对于纯数字,我们也可以通过格式化的方式来补0
n = 123 |
s = "%05d" % n |
assert s = = "00123" |