Python: Running a program to reverse the order of any given word

Question

I am trying to create a program in Python which takes any entered word and reverses the order, and prints the word in the reverse order. But I am not getting the desired results. Here is the code I am using:

myString = input("Enter any String: ")
length = len(myString)-1
reverse = []
i = 0
while length>=0:
    reverse.append(myString[length])
    length -=1

while length<0:
    break
print(reverse)
reverseString = ''
j = 0
while j<=length:
    reverseString +=reverse[j]
    j+=1
while j> length:
    break
print(reverseString)

In the output, I only see this:

Enter any String: De Costa
['a', 't', 's', 'o', 'C', ' ', 'e', 'D']

and not this as expected: 'atsoC eD'

Where am I going wrong?

Use `string[::-1]` this will give you reverse string directly. — Space Impact, Jul 08 '19 at 10:01
@SandeepKadapa If you don't explain what this line does, since it looks like homework, I don't think this would help him. — IMCoins, Jul 08 '19 at 10:02
@IMCoins That is why marked it as duplicate, which has better explanation. — Space Impact, Jul 08 '19 at 10:03

score 1 · Accepted Answer · answered Jul 08 '19 at 10:03

This is because your length variable becomes 0 since you decrement it in the first loop, hence the loop for reverseString never runs, so reverseString always has the value '', you have to reinitialize the length variable so that the loop runs. To do so add length = len(myString)-1 below reverseString = ''

or simply, this

myString = input("Enter any String: ")
length = len(myString)-1
reverse = []
i = 0

while length>=0:
    reverse.append(myString[length])
    length -=1

while length<0:
    break
print(reverse)

reverseString = ''
length = len(myString)-1

j = 0
while j<=length:
    reverseString +=reverse[j]
    j+=1
while j> length:
    break
print(reverseString)

Thanks .... that did the trick .... – srini Jul 08 '19 at 10:15 — srini, Jul 08 '19 at 10:15

score 0 · Answer 2 · answered Jul 08 '19 at 10:05

# using loop
def reverse(s):
  str = ""
  for i in s:
    str = i + str
  return str

print (reverse("Hello World")) # dlroW olleH

# using recursion
def reverse1(s):
    if len(s) == 0:
        return s
    else:
        return reverse(s[1:]) + s[0]

print (reverse1("Hello World")) # dlroW olleH

# using extended slice syntax
def reverse2(string):
    string = string[::-1]
    return string

print (reverse2("Hello World")) # dlroW olleH


# using reversed()
def reverse3(string):
    string = "".join(reversed(string))
    return string

print (reverse3("Hello World")) # dlroW olleH

score 0 · Answer 3 · answered Jul 08 '19 at 10:16

0

You can use index slicing.. i think below code is useful.

myString = input("Enter any String: ")
reverse = ""
reverse = myString[::-1]

answered Jul 08 '19 at 10:16

shravan kumar

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Python: Running a program to reverse the order of any given word

3 Answers3