CODEWITHSUNDEEP
python
Intrepid Diamond
Intrepid Diamond

Reputation: 482

Python: Replace certain words in string with another word? Without built in functions?

Anyone know how to do this?

Ex:

Replace sstring with sreplace in string s

s = "111sstring111"

expected output: "111sreplace111"

Upvotes: 0

Views: 1238

Answers (3)

Hayley Guillou
Hayley Guillou

Reputation: 3973

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

Upvotes: 3

TigerhawkT3
TigerhawkT3

Reputation: 49318

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'

Upvotes: 2

Joran Beasley
Joran Beasley

Reputation: 113988

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

Upvotes: 3

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