Python: Extract numbers from a given string

Last update on April 19 2025 13:05:00 (UTC/GMT +8 hours)

Extract numbers from string.

Write a Python program to extract numbers from a given string.

Sample Solution:

Python Code:

# Define a function to extract numbers from a given string
def test(str1):
    # Use a list comprehension to extract integers from the string if they are digits
    result = [int(str1) for str1 in str1.split() if str1.isdigit()]
    
    # Return the list of extracted numbers
    return result

# Initialize a string containing a mix of words and numbers
str1 = "red 12 black 45 green"

# Print the original string
print("Original string:", str1)

# Print a message indicating the extraction of numbers from the string
print("Extract numbers from the said string:")
# Call the function to extract numbers and print the result
print(test(str1))

Sample Output:

Original string: red 12 black 45 green
Extract numbers from the said string:
[12, 45]

Flowchart:

For more Practice: Solve these Related Problems:

Write a Python program to extract all numeric substrings from a given string using regular expressions.
Write a Python program to iterate over a string and return a list of all numbers found, converting them to integers.
Write a Python program to use re.findall() to capture sequences of digits and output them as a list of integers.
Write a Python program to implement a function that parses a string and returns all contiguous digit sequences as numbers.

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