练习
Topic source# -*- coding:utf-8 -*-def trim(s): if s=='': return s while s[0]==' ': s=s[1:] if s=='': return s while s[-1]==' ': s=s[:-1] return s
# -*- coding:utf-8 -*-def trim(s): if s=='': return s while s[0]==' ': s=s[1:] if s=='': return s while s[-1]==' ': s=s[:-1] return s
- 1
😶
def trim(s):
x = 0
c = -1
for i in s:
if s[x] == " ":
x += 1
else:
break
for i in s:
if s[c] == " ":
c += -1
else:
break
if c == -1:
n = s[x:]
elif c != -1:
n = s[x:c + 1]
print(x,c,n)
return n