A function that reverses a string using a loop

Question

def main():
    print(reverseString("Hello"))

def reverseString(string):
    newString=""
    for i in range(len(string)-1,-1):
        newString+=string[i]
    print newString

main()

I tried running this code but nothing is printed and I don't know what the problem is.

I'm assuming this is a school assignment, or other sort of exercise. But if you want to know a quick way to reverse a string: print( string[::-1] ) — Todd
– Todd, Commented Feb 23, 2020 at 1:05

AChampion · Accepted Answer · 2020-02-23 01:09:41Z

2

This is missing the step of -1 in the range():

for i in range(len(string)-1, -1, -1):

Without the step the for loop immediately exits, leaving newstring as ''.

BTW: you are not returning anything from reverseString() so:

print(reverseString("Hello"))

Will print None, which I assume is not wanted. You probably want to:

return newString

in reverseString().

edited Feb 23, 2020 at 1:09

answered Feb 23, 2020 at 1:02

AChampion

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Comments

Christian Garcia · Accepted Answer · 2020-02-23 01:30:46Z

0

Because your reverseString method doesnt have a return value. try removing print in your main method.

answered Feb 23, 2020 at 1:30

Christian Garcia

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Comments

Darkmoon Chief · Accepted Answer · 2020-02-23 01:01:40Z

-1

Try this:

def main():
    print(reverseString("Hello"))


def reverseString(string):
    newString=""
    for i in range(len(string)):
        newString+=string[len(string)-i-1]
    return newString

main()

answered Feb 23, 2020 at 1:01

Darkmoon Chief

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