Python：用另一个单词替换字符串中的某些单词？ 没有内置功能？

Question

Anyone know how to do this?

Ex:

Replace sstring with sreplace in string s

s = "111sstring111"

expected output: "111sreplace111"

Answer 1

replacement.join(s.split(target))

i guess ... but its probably not going to help the interviewr with your grasp of algorithms ... it would only reveal your grasp of python

re.sub(target,replacement,s) #would also work 

if you are looking for an algorithm that uses no builtins you should probably say that in the question

Answer 2

Here's another option, but again it mostly just tests your python knowledge.

index = theString.find(sstring)
if index != -1:
    theString = theString[:index] + sreplace + theString[index + len(sstring):]

Same idea, generalized for more than one occurrence:

newString = ""
index = theString.find(search)
while index != -1:
    newString = newString + theString[:index] + rep 
    theString = theString[index + len(sstring):]
    index = theString.find(search)
newString += theString

Answer 3

Here's another option using re.sub , which is basically a more flexible str.replace :

>>> import re
>>> s = "111sstring111"
>>> re.sub('sstring', 'sreplace', s)
'111sreplace111'