upper some specific letters-CodePudding

Upper only letters that I have indexes on the list (PYTHON)

s = "string"
l = [1,3]
# output is: sTrIng

Tried this but it wont work

for i in l:
    s[i] = s[i].upper()

CodePudding user response：

Strings are immutable. If you want to check by index, you can for example use a list and update the value by index (and check if that index exists first).

Then at the end, join the characters to a string.

s = "string"
result = list(s)
lst = [1, 3]
length = len(result)

for i in lst:
    if i < length:
        result[i] = result[i].upper()

print("".join(result))

Output

sTrIng

CodePudding user response：

This solution works

s = "string"
l = [1,3]

for i in l:
   newStr = s[i]
   print(newStr.upper())