How to sum the digits in a string in Python

How to sum the digits in a string in Python. That’s the topic I want to introduce to you today. I would sum the digits on a string containing digits and non-digits, and the string consists of only digits. If you’re curious about this topic, read it all. 

Sum the digits in a string in Python

String containing digits and non-digits.

Use the str.isdigit() function.

Syntax:

str.isdigit()

The str.isdigit() function returns True if the string contains only digits and False otherwise.

Example:

• Declare a function that sums the digits in a string.
• The for loop loops through that string. In each iteration, look up the digit using the str.isdigit() function. If it’s a digit, use the int() function to convert it back to an integer.
• Finally, sum those integers.

def sumDigitsStr(strObj):
    sumDigit = 0
    for i in strObj:
        if i.isdigit() == True:
            digits = int(i)
            sumDigit = sumDigit + digits
    return sumDigit

print('The sum of the digits in the string is:', sumDigitsStr('12learnshareit34'))

Output:

The sum of the digits in the string is: 10

With the same idea, you can use list comprehension to make everything faster.

Example:

testStr = '12learnshareit34'

# Use the list comprehension to the sum of digits
sumDigits = sum(int(i) for i in testStr if i.isdigit())
print('The sum of the digits in the string is:', sumDigits)

Output:

The sum of the digits in the string is: 10

Use the str.isnumeric() function.

The function str.isnumeric() and the function str.isdigit() are pretty similar in effect, so the idea of ​​using the str.isnumeric() function is similar to using the str.isdigit() function.

Syntax:

str.isnumeric()

Example:

• Declare a function that sums the digits in a string.
• The for loop loops through that string. In each iteration, look up the digit using the str.isnumeric() function. If it’s a digit, use the int() function to convert it back to an integer.
• Finally, sum those integers.

def sumDigitsStr(strObj):
    sumDigit = 0
    for i in strObj:
        if i.isnumeric() == True:
            digits = int(i)
            sumDigit = sumDigit + digits
    return sumDigit

print('The sum of the digits in the string is:', sumDigitsStr('12learnshareit34'))

Output:

The sum of the digits in the string is: 10

You can also use list comprehension to do the sum of digits in this way.

Example:

testStr = '12learnshareit34'

# Use the list comprehension to the sum of digits
sumDigits = sum(int(i) for i in testStr if i.isnumeric())
print('The sum of the digits in the string is:', sumDigits)

Output:

The sum of the digits in the string is: 10

The string consists of only digits.

For strings containing only digits, you won’t have to use the str.isdigit() function and the str.numeric() function to check. 

Example:

testStr = '1234'

# Use the list comprehension to the sum of digits
sumDigits = sum(int(i) for i in testStr)
print('The sum of the digits in the string is:', sumDigits)

Output:

The sum of the digits in the string is: 10

Summary:

In conclude, this article have shown you the causes with several ways to sum the digits in a string in Python. If you have any suggestions or comments about the article, please comment.

Jason Wilson

My name is Jason Wilson, you can call me Jason. My major is information technology, and I am proficient in C++, Python, and Java. I hope my writings are useful to you while you study programming languages.

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Name of the university: HHAU
Major: IT
Programming Languages: C++, Python, Java