strip()函数是python3里对字符串操作的内建函数，它可以自动的去除字符串的首尾的指定所有字符(返回值)。默认是去除空格字符。
下面是自己去实现该函数的代码。
#!/usr/bin/env python
def stringstrip(string1):
length = len(string1)
index = 0
if length == 0:
print(“Input string is no char!”)
return
while True:
if (string1[index] == ‘ ‘):
index += 1
string1 = string1[index:]
continue
print(‘there are %d’ % (index), ‘space begin with string1’)
if index == length-1:
print(‘BAD! All string1 are fill with space ‘)
return
break
index = -1
while True:
if (string1[index] == ‘ ‘):
index -= 1
string1 = string1[:index]
continue
print(‘there are %d’ % (index+1), ‘space reverse with string1’)
break
return string1
if __name__ == “__main__”:
while True:
newstring = stringstrip(input(“Enter your string:”))
print(‘Del space, your new string is ‘ + newstring)