Python - Write a for loop to display a given number in reverse [duplicate]

Here's an answer that spits out a number in reverse, instead of reversing a string, by repeatedly dividing it by 10 and getting the remainder each time:

num = int(input("Enter a number: "))

while num > 0:
    num, remainder = divmod(num, 10)
    print remainder,

Oh and I didn't read the requirements carefully either! It has to be a for loop. Tsk.

from math import ceil, log10

num = int(input("Enter a number: "))

for i in range(int(ceil(math.log10(num)))): # => how many digits in the number
    num, remainder = divmod(num, 10)
    print remainder,

You don't need to make it int and again make it str! Make it straight like this:

num = input("insert a number of your choice ")
print (num[::-1])

Or, try this using for loop:

>>> rev = ''
>>> for i in range(len(num), 0, -1):
...     rev += num[i-1]
>>> print(int(rev))

Best way to loop over a python string backwards says the most efficient/recommended way would be:

>>> for c in reversed(num):
...     print(c, end='')

Why make it a number? 'In reverse' implies a string. So don't cast it to int but use it as string instead and just loop over it backwards.

You've got here a variety of different answers, many of which look similar.

for i in str(num)[::-1]: 
    print i

This concise variation does a few things worth saying in english, namely:

1. Cast num to a string
2. reverse it (with [::-1], an example of slicing, a pythonic idiom that I recommend you befriend)
3. finally, loop over the resultant string (since strings are iterable, you can loop over them)
4. and print each character.

Almost all the answers use [::-1] to reverse the list -- as you read more code, you will see it more places. I recommend reading more about it on S.O. here.

I hate to do your problem for you since you didn't really try to actually solve it or say what you're specifically having a problem with, but:

 num = str(input("..."))
 output = [num[-i] for i in range(len(num))]
 print(output)

output = input("Insert number of your choice: ")[::-1]
print("Your output!: %s" % output)

In python 3.x+ input is automatically a string, doing [::-1] reverses the order of the string