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reverse a string in Python

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gostov2

gos

Posts: 12

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Joined: Mar, 2023

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Posted

First have a look at the code:

 

def reverse(x):
    output = ""
    for c in x:
        output = c + output

    return output

print(reverse("Helo"))

 

This function works great in Python to invert a text; I just don't understand why or how it works.

 

If I iterate through a string, for example, it will usually start at "H" and work its way down to "O." How come it's going backwards here?

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Thank you

yvneEnvy

Envy

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Replied

Thanks for the lesson, vouch.

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gostov2 0 Reputation

Commented

You're welcome, compinche

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yvneEnvy 3 Reputation

Commented

Look at me hector, look at me.

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What happens when Ε 

                                       Γ‹

                                       X

boyke

kid with a laptop

vip

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Replied

gostov you are cool for using python πŸ‘

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gostov2 0 Reputation

Commented

Thanks; I'll sleep well tonight.

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https://i.imgur.com/fqGoInR.png

fortnite balls

reversed_coffee

nicholas

moderator

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Replied

It's because you're doing c + output instead of output + c. The character is put first, then the rest, so it's building it in a reverse order. If you're reversing "hello" with this function, your output will look like this per iteration: "", "h", "eh", "leh", "lleh", "olleh".

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gostov2 0 Reputation

Commented

i see Thank you sir for your help

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Akula 33 Reputation

Commented

summarised it nicely, saved me some time from writing it out thanks

πŸ˜‚

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https://github.com/reversed-coffee

Whoman

#3561

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Replied

or you can just do:

def reverse(x):
    return x[::-1]

Comments

gostov2 0 Reputation

Commented

Thank you good person

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TERIHAX 22 Reputation

Commented

yea thats hella unreadable

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Alternate 38 Reputation

Commented

@TERIHAX no it not just need be pro 😎😎😎😎😎😎

 

also this easier

 

reverse = lambda x: x[::-1]

 

easy pro frfr ong πŸ˜ŽπŸ˜ŽπŸ˜ŽπŸ˜ŽπŸ˜ŽπŸ—ΏπŸ˜ŽπŸ˜ŽπŸ˜ŽπŸ˜ŽπŸ˜ŽπŸ‡ΊπŸ‡ΈπŸ˜ŽπŸ˜ŽπŸ˜ŽπŸ˜ŽπŸžπŸ˜ŽπŸ˜ŽπŸ˜ŽπŸ˜Ž

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Whoman 13 Reputation

Commented

@Alternate why you the why the why

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https://i.imgur.com/21V9TOF.png

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