Python: Sum of all numerical values embedded in a sentence

Last update on May 24 2025 10:48:54 (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:

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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