Reversing Characters within a List using a loop

Question

This is my code I have come up with trying to reverse these strings

presidents = [ "George Washington " , " John Adams " , " Thomas Jefferson " , " James Madison " , " James Monroe " ," John Quincy Adams " ]

reversedPresidents=""
for ch in presidents:
    reversedPresidents=ch+reversedPresidents

print(reversedPresidents)

As of now, it only prints the list backwards like this:

John Quincy Adams  James Monroe  James Madison  Thomas Jefferson  John Adams George Washington

I need it to output the list like:

notgnihsaW egroeG
smadA nhoJ

and so on

Change `ch` to `ch[::-1]` and then `+reversedPresidents` in the loop. — yesemsanthoshkumar, Dec 06 '17 at 05:21
The reason it prints the list backwards is because you are reversing the list and not the characters. — Mateen Ulhaq, Dec 06 '17 at 05:21
Possible duplicate of [Reverse a string in Python](https://stackoverflow.com/questions/931092/reverse-a-string-in-python) — Mateen Ulhaq, Dec 06 '17 at 05:22
What's with the torrential flood of downvotes? Please explain them in the comments. — Sebastian Mendez, Dec 06 '17 at 05:24
@Sebastian it's a blatant duplicate with no attempt at solving the problem. — jhpratt, Dec 06 '17 at 17:44
That's fair, but there were 6 downvotes with only one comment about possible issues. — Sebastian Mendez, Dec 06 '17 at 19:43

score 0 · Answer 1 · answered Dec 06 '17 at 05:21

0

Try this:

>>> reversedPresidents = [p[::-1] for p in presidents]
>>> print(reversedPresidents)
[' notgnihsaW egroeG', ' smadA nhoJ ', ' nosreffeJ samohT ', ' nosidaM semaJ ', ' eornoM semaJ ', ' smadA ycniuQ nhoJ ']
>>>

answered Dec 06 '17 at 05:21

Tom Karzes

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score 0 · Answer 2 · answered Dec 06 '17 at 05:47

Beauty of Recursion :

presidents = [ "George Washington " , " John Adams " , " Thomas Jefferson " , " James Madison " , " James Monroe " ," John Quincy Adams " ]

def reverse_list(list_1):
    for item in list_1:
        def reverse(word):
            if len(word)==0:
                return word
            else:
                return reverse(word[1:]) + word[0]
        print(reverse(item))
print(reverse_list(presidents))

output:

 notgnihsaW egroeG
 smadA nhoJ 
 nosreffeJ samohT 
 nosidaM semaJ 
 eornoM semaJ 
 smadA ycniuQ nhoJ

RoadRunner · Answer 3 · 2017-12-06T05:59:07.703

0

You can try this also:

>>> presidents = [ "George Washington " , " John Adams " , " Thomas Jefferson " , " James Madison " , " James Monroe " ," John Quincy Adams " ]

>>>> print(["".join(reversed(x)) for x in presidents])
[' notgnihsaW egroeG', ' smadA nhoJ ', ' nosreffeJ samohT ', ' nosidaM semaJ ', ' eornoM semaJ ', ' smadA ycniuQ nhoJ ']

edited Dec 06 '17 at 05:59

answered Dec 06 '17 at 05:53

RoadRunner

25,803
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score 0 · Answer 4 · answered Dec 06 '17 at 06:40

Try this:

presidents = [ "George Washington " , " John Adams " , " Thomas Jefferson " , 
" James Madison " , " James Monroe " ," John Quincy Adams " ]

reversedPresidents=[]
for ch in presidents: 
     reversedPresidents.append(ch[::-1])

print(reversedPresidents)

 [' notgnihsaW egroeG', ' smadA nhoJ ', ' nosreffeJ samohT ', ' nosidaM 
  semaJ ', ' eornoM semaJ ', ' smadA ycniuQ nhoJ ']

Reversing Characters within a List using a loop

4 Answers4