Trouble Iterating Over String Indexes in Python

Question

I want Python to take a string and iterate through it, printing several variations with an individual letter capitalized. Like this:

Input:

"hello world"

Output:

"Hello world", "hEllo world", "heLlo world", etc.

Here's what I have so far:

string = "hello world".lower()
for x in range(0, len(string)):
    new_string = string[:(x-1)].lower() + string[x].capitalize() + string[(x-1):].lower()
    print(new_string)

However, this code spits out some pretty funky looking strings:

hello worlHd
Ehello world
hLello world
etc.

I suspect my issue has something to do with the way I'm indexing the string, but I'm not sure what to change. Any ideas?

You've got the indexing wrong: new_string = string[:x].lower() + string[x].upper() + string[x+1:].lower() — Yevhen Kuzmovych
– Yevhen Kuzmovych, Commented Jul 24, 2021 at 16:04
something like this could work: [print(string[:(x-1)].lower() + string[x-1].capitalize() + string[(x):].lower()) for x in range(1, len(string)+1)] — Liam
– Liam, Commented Jul 24, 2021 at 16:08
What happened when you tried checking the values of the individual slices? (try using repr so that you can see quotes around the strings, to highlight empty strings,whitespace etc.) — Karl Knechtel
– Karl Knechtel, Commented Jul 24, 2021 at 16:08
I think the wrong code is that in your first loop ,the expression : string[:(x-1)] means from the zero index ( inclusuve) to the LAST index( exclusive) = string[ 0 : -1)] — Tou You
– Tou You, Commented Jul 24, 2021 at 16:11

A.M. Ducu · Accepted Answer · 2021-07-24 16:05:03Z

2

Here's a simple change that should make it work with your syntax.

for i in range(len(string)):
    print(string[:i] + string[i].upper() + string[i+1:])

Output:

Hello world
hEllo world
heLlo world
helLo world
hellO world
hello world
hello World
hello wOrld
hello woRld
hello worLd
hello worlD

There are other methods to do this too, but this one is simple to understand.

PS: You can also add .lower() to the left and right sides. It all depends on the inputs you use.

answered Jul 24, 2021 at 16:05

A.M. Ducu

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Comments

Onurgule · Accepted Answer · 2021-07-24 16:07:28Z

1

string = "hello world".lower()
for x in range(0, len(string)):
    new_string = string[:(x)].lower() + string[x].capitalize()  + string[(x+1):].lower()
    print(new_string)

You need to think like index. So if you use string[(:x-1)] it will add the capitalized character twice.

answered Jul 24, 2021 at 16:07

Onurgule

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