CODEWITHSUNDEEP
python
Rohith Sharma
Rohith Sharma

Reputation: 43

How to replace characters in a string in python

How to replace characters in a string which we know the exact indexes in python?

Ex : name = "ABCDEFGH" I need to change all odd index positions characters into '$' character.

    name = "A$C$E$G$"

(Considered indexes bigin from 0 )

Upvotes: 1

Views: 893

Answers (4)

Thilina Chathuranga
Thilina Chathuranga

Reputation: 113

name = "ABCDEFGH"
nameL = list(name)

for i in range(len(nameL)):
    if i%2==1:
        nameL[i] = '$'

name = ''.join(nameL)
print(name)

Upvotes: 1

csunday95
csunday95

Reputation: 1319

Also '$'.join(s[::2]) Just takes even letters, casts them to a list of chars and then interleaves $ 

 ''.join(['$' if i in idx else s[i] for i in range(len(s))])

works for any index array idx

Upvotes: 12

Andrew
Andrew

Reputation: 513

You can reference string elements by index and form a new string. Something like this should work:

startingstring = 'mylittlestring'
nstr = ''
for i in range(0,len(startingstring)):
    if i % 2 == 0:
            nstr += startingstring[i]
    else:
            nstr += '$'

Then do with nstr as you like.

Upvotes: 1

Kasravnd
Kasravnd

Reputation: 107287

You can use enumerate to loop over the string and get the indices in each iteration then based your logic you can keep the proper elements :

>>> ''.join([j if i%2==0 else '$' for i,j in enumerate(name)])
'A$C$E$G$'

Upvotes: 3

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