def trim(s):
i = 0
while i < len(s):
if s[i] == '':
i = i + 1
else:
a = i
break
t = 0
while t < len(s):
if s[-t-1] == '':
t = t + 1
b = len(s) - t - 1
s = s[a:b]
return s
s = input("请输入一串字符: ")
trim(s)
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用户6121519516
def trim(s):
i = 0
while i < len(s):
if s[i] == '':
i = i + 1
else:
a = i
break
t = 0
while t < len(s):
if s[-t-1] == '':
t = t + 1
else:
b = len(s) - t - 1
break
s = s[a:b]
return s
s = input("请输入一串字符: ")
trim(s)