Python Program to move numbers to the end of the string

Given a string, the task is to write a Python program to move all the numbers in it to its end.

Examples:

Input : test_str = ‘geek2eeks4g1eek5sbest6forall9’ 
Output : geekeeksgeeksbestforall241569 
Explanation : All numbers are moved to end.

Input : test_str = ‘geekeeksg1eek5sbest6forall9’ 
Output : geekeeksgeeksbestforall1569 
Explanation : All numbers are moved to end. 

Method 1 : Using isdigit() and loop

In this, we check elements and digits using isdigit(), keeping track of all the numbers and append at end of string post iteration.

Python3

# initializing string
test_str = 'geek2eeks4g1eek5sbest6forall9'

# printing original string
print("The original string is : " + str(test_str))

# getting all numbers and removing digits
res = ''
dig = ''
for ele in test_str:
    if ele.isdigit():
        dig += ele
    else:
        res += ele

# adding digits at end
res += dig

# printing result
print("Strings after digits at end : " + str(res))

Output:

The original string is : geek2eeks4g1eek5sbest6forall9

Strings after digits at end : geekeeksgeeksbestforall241569

Method 2 : Using join()

In this, we perform the task of extracting digits and ignoring them using separate comprehensions and then joining both. At the end, digit string is joined at end of actual string.

Python3

# initializing string
test_str = 'geek2eeks4g1eek5sbest6forall9'

# printing original string
print("The original string is : " + str(test_str))

# getting all numbers
dig = ''.join(ele for ele in test_str if ele.isdigit())

# getting all elements not digit
res = ''.join(ele for ele in test_str if not ele.isdigit())

# adding digits at end
res += dig

# printing result
print("Strings after digits at end : " + str(res))

Output:

The original string is : geek2eeks4g1eek5sbest6forall9

Strings after digits at end : geekeeksgeeksbestforall241569

Method 3: Without using any built-in method.

Python3

# initializing string
test_str = 'geek2eeks4g1eek5sbest6forall9'

# printing original string
print("The original string is : " + str(test_str))

digits="0123456789"

# getting all numbers and removing digits
res = ''
dig = ''
for ele in test_str:
    if ele in digits:
        dig += ele
    else:
        res += ele

# adding digits at end
res += dig

# printing result
print("Strings after digits at end : " + str(res))

Output

The original string is : geek2eeks4g1eek5sbest6forall9
Strings after digits at end : geekeeksgeeksbestforall241569