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reverse a string in Python

Posts: 14

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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

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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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Posts: 1123

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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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Posts: 1436

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Replied

or you can just do:

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

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gostov2 0 Reputation

Commented

Thank you good person

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TERIHAX 32 Reputation

Commented

yea thats hella unreadable

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Alternate 40 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 20 Reputation

Commented

@Alternate why you the why the why

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TERIHAX 32 Reputation

Commented

@Alternate omg really???

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i use arch btw

zenkai

zenkai

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Replied

In the given code, the reverse function takes a string x as input and returns the reversed version of that string.

The loop iterates through each character c in the input string. In each iteration, the current character c is concatenated with the existing output string using the c + output operation. By using this operation, the current character is added at the beginning of the output string, effectively reversing the order of characters.

So, when you call reverse("Helo"), the iterations will proceed as follows:

  1. output = "" + "H" = "H"
  2. output = "H" + "e" = "eH"
  3. output = "eH" + "l" = "leH"
  4. output = "leH" + "o" = "oleH"

Finally, the reversed string "oleH" is returned and printed as the output. πŸ‘

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