Python: Sum of all numerical values embedded in a sentence

Last update on April 17 2025 13:05:42 (UTC/GMT +8 hours)

Sum of Numbers in Text

Write a Python program to sum all numerical values (positive integers) embedded in a sentence.

Input:
Sentences with positive integers are given over multiple lines. Each line is a character string containing one-byte alphanumeric characters, symbols, spaces, or an empty line. However the input is 80 characters or less per line and the sum is 10,000 or less.

Sample Solution:

Python Code:

# Import sys and re modules
import sys
import re

# Define a function named 'test' that takes a string 'stri' as a parameter
def test(stri):
    # Print statement to instruct the user to input text and numeric values (terminate with )
    print("Input some text and numeric values ( to exit):")
    
    # Use regex to find all numeric values in the input string and sum them
    numeric_sum = sum(map(int, re.findall(r"[0-9]{1,5}", stri)))
    
    # Print the sum of the numeric values
    print("Sum of the numeric values: ", numeric_sum)

# Test the 'test' function with different input strings
print(test("sd1fdsfs23 dssd56"))
print(test("15apple2banana"))
print(test("flowers5fruit5"))

Sample Output:

Input some text and numeric values ( to exit):
Sum of the numeric values:  80
None
Input some text and numeric values ( to exit):
Sum of the numeric values:  17
None
Input some text and numeric values ( to exit):
Sum of the numeric values:  10
None

Explanation:

Here is a breakdown of the above Python code:

Import the "sys" and "re" modules.
Define a function named "test()" that takes a string parameter 'stri'.
Print a statement instructing the user to input text and numeric values, indicating termination with <ctrl-d>.
Use the re.findall function with a regex pattern to find all numeric values (1 to 5 digits) in the input string.
Map the found numeric values to integers and calculate their sum using "sum()".
Print the sum of the numeric values.
Test the "test()" function with three different input strings. Note: The function should not return anything (hence, print(test(...)) may print None).

Visual Presentation:

Python: Sum of all numerical values embedded in a sentence.

Flowchart:

For more Practice: Solve these Related Problems:

Write a Python program to extract all integer numbers from a multi-line text and output their total sum.
Write a Python program to find and sum only the standalone numeric values in a sentence, ignoring numbers embedded in words.
Write a Python program to sum all positive integers found in a given text block using regular expressions.
Write a Python program to parse a text with varied delimiters and compute the sum of all numbers present.

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Python Code Editor:

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