def my_trim(s):
l = len(s)
count=0
t=-1
if l <= 0:
return ' '
else:
while 1:
if s[count]!=' ':
s=s[count:l]
break
else:
count=count+1
while 1:
l2=len(s)
if s[t]!=' ':
s = s[:l2+t+1]
break
else:
t=t-1
return s
print('result=',my_trim(' hello world '))
暗影之_刃
def my_trim(s): l = len(s) count=0 t=-1 if l <= 0: return ' ' else: while 1: if s[count]!=' ': s=s[count:l] break else: count=count+1 while 1: l2=len(s) if s[t]!=' ': s = s[:l2+t+1] break else: t=t-1 return s print('result=',my_trim(' hello world '))