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Python - Convert Number to List of Integers

Last Updated : 11 Jul, 2025

We need to split a number into its individual digits and represent them as a list of integers. For instance, the number 12345 can be converted to the list [1, 2, 3, 4, 5]. Let's discuss several methods to achieve this conversion.

Combination of str() and map() is a straightforward and efficient way to convert a number into a list of integers.

# Define the number
n = 12345

# Convert number to list of integers
res = list(map(int, str(n)))

print(res) 

Explanation:

• str() function converts the number into a string, allowing iteration over each digit.
• map() function applies int to each character of the string, converting it back to an integer.
• Finally, the list() constructor converts the map object into a list.

Let's explore some more ways and see how we can convert numbers to a list of integers.

List comprehension provides a Pythonic way to convert a number into a list of integers.

# Define the number
n = 12345

# Convert number to list of integers using list comprehension
res = [int(digit) for digit in str(n)]

print(res) 

Explanation:

• str() function is used to convert the number into a string.
• list comprehension iterates over each character of the string, converts it to an integer, and adds it to the list.

A while loop can be used to manually extract digits from the number and store them in a list.

# Define the number
n = 12345

# Initialize an empty list
res = []

# Extract digits using a while loop
while n > 0:
    res.append(n % 10)  # Extract the last digit
    n //= 10  # Remove the last digit

# Reverse the list to maintain the original order
res = res[::-1]

print(res) 

Explanation:

• While loop iterates until the number becomes 0.
• Last digit is extracted using the modulo operator % and added to the list.
• The number is reduced by removing the last digit (num //= 10).
• The list is reversed at the end to restore the original order of the digits.

divmod() function can simplify the process of extracting digits manually.

# Define the number
n = 12345

# Initialize an empty list
res = []

# Extract digits using divmod
while n > 0:
    n, digit = divmod(n, 10)  # Extract last digit and update number
    res.append(digit)

# Reverse the list to maintain the original order
res = res[::-1]

print(res) 

Explanation:

• divmod() function divides the number by 10, returning both the quotient and remainder.
• The remainder (last digit) is appended to the list.
• list is reversed at the end to maintain the correct order of digits.

Recursion can also be used to break down the number into its digits and store them in a list.

# Define the function to extract digits recursively
def number_to_list(n):
    if n == 0:
        return []
    return number_to_list(n // 10) + [n % 10]

# Define the number
n = 12345

# Convert number to list of integers
res = number_to_list(n)

print(res)

Explanation:

• The function keeps dividing the number by 10 to extract digits.
• The base case stops the recursion when the number reaches 0.
• The digits are added to the list in the correct order during the recursive return.

Python program to convert number to List of Integers

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