完全符合要求的作业

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完全符合要求的作业

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魅影迷惑你

#1 Created at ... [Delete] [Delete and Lock User]

def trip(s):

#使用递归,清除字符串头部空白区域

if len(s) == 0:

return s

if s[0]==' ' or s[0]=='\t': # 考虑到空白有“space”和“tab”两种情况

s=trip(s[1:]) # 先清除头部空白

if s[-1]==' ' or s[-1]=='\t':

s=trip(s[:-2]) # 再去除尾部空白

return s

Ethereal

#2 Created at ... [Delete] [Delete and Lock User]

运行到最后一个测试报错，报错信息如下：

Traceback (most recent call last):

File "e:\PY代码\练习\去字符串首尾空格.py", line 20, in <module>

elif trim(' ') != '':

File "e:\PY代码\练习\去字符串首尾空格.py", line 5, in trim

s=trim(s[1:])

File "e:\PY代码\练习\去字符串首尾空格.py", line 5, in trim

s=trim(s[1:])

File "e:\PY代码\练习\去字符串首尾空格.py", line 5, in trim

s=trim(s[1:])

File "e:\PY代码\练习\去字符串首尾空格.py", line 6, in trim

if s[-1]==' ' or s[-1]=='\t':

IndexError: string index out of range

Ethereal

#3 Created at ... [Delete] [Delete and Lock User]

源代码：

def trim(s):

if len(s)==0:

return s

if s[0]==' ' or s[0]=='\t':

s=trim(s[1:])

if s[-1]==' ' or s[-1]=='\t':

s=trim(s[:-2])

return s

rainux

#4 Created at ... [Delete] [Delete and Lock User]

s=trim(s[:-2]) // 这里错了
应改为
s=trim(s[:-1])

Moria_XD

#5 Created at ... [Delete] [Delete and Lock User]

def trim(s):

while s[:1] == ' ':

s = s[1:]

while s[-1:-2:-1] == ' ':

s = s[:-1]

return s