链接文字
def trim(s):
j = 1
k = 1
while j < len(s) :
print("s的长度是%d" % len(s))
a = s[0:1]
#print('现在a是',a,'个空格')
if a == ' ':
s = s[1:]
j = j + 1
else :
while k < len(s):
b = s[-1:]
if b == ' ':
s = s[:len(s)-1]
k = k + 1
return s
print(trim(' hello '))
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天应兄
def trim(s):
j = 1
k = 1
while j < len(s) :
print("s的长度是%d" % len(s))
a = s[0:1]
#print('现在a是',a,'个空格')
if a == ' ':
s = s[1:]
j = j + 1
else :
j = j + 1
while k < len(s):
b = s[-1:]
if b == ' ':
s = s[:len(s)-1]
k = k + 1
else :
k = k + 1
return s
print(trim(' hello '))