s = 'hello '
def trim(s):
return s
if trim(s[0]) == ' ':
print(s[1:])
elif trim(s[-1]) == ' ':
print(s[:-1])
else:
print('格式正确')
s = 'hello '
def trim(s):
return s
if trim(s[0]) == ' ':
print(s[1:])
elif trim(s[-1]) == ' ':
print(s[:-1])
else:
print('格式正确')