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LAST UPDATED: JUNE 10, 2023

# Python | Find Sum of all Numbers & Digits in an Alpha-Numeric String

Technology #python

In the vast realm of data manipulation and analysis, extracting and computing values from complex strings can be a common requirement. Python, renowned for its versatility, offers powerful tools to tackle such challenges. If you find yourself working with alpha-numeric strings and need to extract and calculate the sum of all numbers and digits within them, you're in the right place.

In this article, we will explore efficient techniques in Python to extract numerical values from an alpha-numeric string and compute their sum. Get ready to unlock the hidden numeric treasures within strings and elevate your data processing capabilities.

Recently, I attend an interview on our campus. In the interview, the interviewer asked me to solve this problem.

This is a very simple problem, just the basics of a language are enough for one to solve this problem.

## Algorithm to solve the problem:

1. Take the string input from the user and store it in variable `n`.

2. Initialize `sum = 0, temp_num = 0`

3. Now loop through all characters in that string.

4. If it is an alphabet, ignore it

5. If it is a numeric value, append it to the variable `temp_num` until the next character is an alphabet and add `temp_num` to the sum.

6. Finally, print the sum at the end of the program. Thus gives the sum of all numbers in an alpha-numeric string.

## Code for Sum of all Numbers in Alpha-Numeric String

Let's see how we can find the sum of numbers in an alpha-numeric string. So for example the string is s1s22s33, then numbers are 1, 22, and 33.

### 1. Without Recursion

``````n = input("Enter an Alpha-Numeric String: ")
n_sum = 0
temp_num = ""
for i in n:
if( i.isalpha() ):
if( temp_num != "" ):
n_sum = n_sum + int(temp_num)
temp_num = 0
else:
temp_num = str(temp_num) + str(i)

if( temp_num != "" ):
n_sum = n_sum + int(temp_num)
temp_num = 0

print(n_sum)``````

Enter an Alpha-Numeric String: s1s22s33
56

### 2. With Recursion

Now we will see another way of implementing this, using recursion.

``````def sumOfNumbers(string, n, temp, sums):

curr_val = string[n]

if( curr_val.isalpha() ):
sums = sums + int(temp)
temp = 0
else:
temp = str(temp) + str(curr_val)

if n == 0:
return sums
else:
return sumOfNumbers(string, n-1, temp, sums)

string = input("Enter a Alpha Numeric String: ")
n = len(string) - 1
print( sumOfNumbers(string, n, temp=0, sums=0) )``````

Enter an Alpha-Numeric String: study24tonight77
101

## Code for Sum of all Digits In Alpha-Numeric String

Here the algorithm is very simple, just add the value to the sum only if it is a numeric value and finally print the sum. In this case, for string s1s22s33, the digits are 1, 2, 2, 3, and 3.

### 1. Without Recursion

``````string = input("Enter a Alpha-Numeric String: ")
sums = 0
for i in string:
if( i.isnumeric() ):
sums = sums+int(i)
print(sums)``````

Enter an Alpha-Numeric String: a11s22s55
16

### 2. Using Recursion

``````def sumOfNumbers(string, n, sums):

curr_val = string[n]
if( curr_val.isnumeric() ):
sums = sums + int(curr_val)

if n == 0:
return sums
else:
return sumOfNumbers(string, n-1, sums)

string = input("Enter a Alpha Numeric String: ")
n = len(string) - 1
print( sumOfNumbers(string, n, sums=0) )
``````

Enter an Alpha-Numeric String: study24tonight77
20

## Conclusion

Python empowers us to conquer the intricate world of alpha-numeric strings and effortlessly compute the sum of all numbers and digits contained within them.

By leveraging the capabilities of string manipulation and list comprehension, we can extract numerical values and perform arithmetic operations to derive meaningful insights from complex data. Whether you're dealing with financial data, textual analysis, or any field involving string-based numerical information, mastering the art of finding the sum of numbers and digits in an alpha-numeric string will undoubtedly enhance your data processing prowess.

This is a brief explanation of how to find the sum of all numbers and digits in an alpha-numeric string in Python. I hope that you enjoyed the post. If you feel that this post is useful, please share it with your friends and colleagues.

Thanks for reading it till the end.

### 1. What is an alpha-numeric string?

An alpha-numeric string is a sequence of characters that can contain both letters (alphabets) and numbers. It combines alphanumeric characters, such as "A12B3C" or "abc123xyz."

### 2. How can I find the sum of numbers and digits in an alpha-numeric string using Python?

To find the sum of numbers and digits in an alpha-numeric string, you can use Python's built-in string manipulation functions, such as isdigit(), and list comprehension to extract numerical values. By converting the extracted values to integers, you can then compute their sum.

### 3. Can the alpha-numeric string contain floating-point numbers?

Yes, the alpha-numeric string can contain floating-point numbers. However, when extracting and computing the sum, you need to decide whether to treat the decimal part as a separate value or include it as part of the whole number.

### 4. How do I handle negative numbers in the alpha-numeric string?

To handle negative numbers in the alpha-numeric string, you can look for the "-" symbol preceding a number and treat it as a negative value. You can then convert the extracted negative numbers to integers and include them in the sum calculation.

### 5. What if the alpha-numeric string contains non-digit characters?

If the alpha-numeric string contains non-digit characters, they will be ignored during the extraction process. Only numerical values, represented by digits, will be considered for the sum calculation. Any non-digit characters will not contribute to the final result.

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