第一次发作业不知道对不对
Topic sourceif len(s) == 0:
return s
while s[0] ==' ':
s = s[1:]
if len(s) == 0:
return s
while s[-1] ==' ':
s = s[:-1]
return s
- 1
if len(s) == 0:
return s
while s[0] ==' ':
s = s[1:]
if len(s) == 0:
return s
while s[-1] ==' ':
s = s[:-1]
return s
树边上的海
def trim(s): if s[0] == 0: return(s[1:]) elif s[-1] == 0: return(s[:-2]) elif s[0] == 0 and s[-1] == 0 : return(s[1:-2]) else : return s