[英]'string index out of range' when replacing first and last characaters of string?
I am trying to exchange the first and last characters of a string but 'string index out of range' error is occurring.我正在尝试交换字符串的第一个和最后一个字符,但出现“字符串索引超出范围”错误。 Please help
请帮忙
def front_back(str):
ind=len(str)-1
newstring=str.replace(str[0],str[ind])
newerstring=newstring.replace(newstring[ind],str[0])
return newerstring
String objects are immutable, means it accepts no change in its elements. String 对象是不可变的,这意味着它的元素不接受任何更改。 The .replace() method is just returning a new instance of string.
.replace()方法只是返回一个新的字符串实例。
You can try this way:你可以试试这个方法:
def front_back(s):
return s[-1] + s[1:-1] + s[0] if len(s) >= 2 else s
print(front_back('hi there')) #output: ei therh
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