    # Write a python program to compute sum of digit of a given string

Generator expressions are used to perform some operation for every element, or select a subset of elements that meet a condition.

On each iteration, we check if the character is a digit.

The method returns `True` if all characters in the string are digits and there is at least 1 character, otherwise `False` is returned.

We convert all digits to integers and use the `sum()` function to get the total.

The last step is to use the `sum()` function to sum the numbers in the generator object.

The function takes an iterable, sums its items from left to right and returns the total.

The `sum` function takes the following 2 arguments:

NameDescriptioniterablethe iterable whose items to sumstartsums the `start` value and the items of the iterable. `sum` defaults to `0` (optional)

If your string is guaranteed to only contain digits, you don't have to use the `str.isdigit()` method.

## Sum the digits of a number in Python

To sum the digits of a number:

1. Use the `True`0 class to convert the number to a string.
2. Use a generator expression to iterate over the string.
3. On each iteration, convert the digit to a number with the `True`1 class.
4. Pass the generator object to the `sum()` function.

The first example uses the `True`0 class and a generator expression to sum the digits in a number.

Strings are iterable and integers are not, so we have to convert the integer to a string.

Generator expressions are used to perform some operation for every element, or select a subset of elements that meet a condition.

On each iteration, we convert the digit that is wrapped in a string to an integer and return the result.

The last step is to pass the generator object to the `sum()` function.

The function takes an iterable, sums its items from left to right and returns the total.

The second example uses the `True`5 function instead of a generator expression for the conversion.

The function takes a function and an iterable as arguments and calls the function with each item of the iterable.

The `True`6 function calls the `True`1 class with each digit in the string and returns a `True`6 object that we can directly pass to the `sum()` function.

Alternatively, you can use a `False`0 loop.

## Sum the digits of a number using a False0 loop

To sum the digits of a number:

1. Initialize a variable for the sum and set it to `0`.
2. Use a `False`0 loop to iterate while the number variable is truthy.
3. Get the rightmost digit of the number with `False`4 and add it to the sum variable.
4. Remove the rightmost digit by floor-dividing by `False`5.

We used a `False`0 loop to iterate while the `False`7 variable stores a truthy value.

`0` is a falsy value, so as soon as the `False`7 variable gets set to `0`, the condition is no longer met.

We used the modulo `sum()`1 operator to get the rightmost digit of the number.

The operator returns the remainder from the division of the first value by the second.

Once we reassign the `sum()`2 variable to its current value plus the rightmost digit of the number, we have to remove the rightmost digit.

We can remove the rightmost digit of a number by using floor division `sum()`3 with `False`5.

Division `sum()`5 of integers yields a float, while floor division `sum()`3 of integers results in an integer.

The result of using the floor division operator is that of a mathematical division with the `sum()`7 function applied to the result.

Eventually `sum()`8 gets floor-divided by `False`5, which returns `0`, and the `False`0 loop stops iterating.

The code snippet above reassigns the value of the `False`7 variable on each iteration and eventually sets it to `0`.

Given a number as an input the objective is to calculate the sum of the digits of the number. We first break down the number into digits and then add all the digits to the sum variable. We use the following operators to break down the string,

• Modulo operator %: We use this operator to extract the digits from the number.
• Divide operator /: We use this operator to shorten the number after the digit has been extracted.

We use the above-mentioned operators to find the sum of the digits of the number. Here are some of the methods to solve the above-mentioned problem.

### How do you sum a digit in a string in Python?

Python: Compute sum of digits of a given string.
Sample Solution:-.
Python Code: def sum_digits_string(str1): sum_digit = 0 for x in str1: if x.isdigit() == True: z = int(x) sum_digit = sum_digit + z return sum_digit print(sum_digits_string("123abcd45")) print(sum_digits_string("abcd1234")) ... .
Pictorial Presentation:.

### How do you find the sum of digits in a string?

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