2 Ways to Get int From String In Python

Using regex

Get First Number:

import re # Import re Module

string = "hello my name is Mark i'm 20 years old" # String

# "/d" = Returns a match where the string contains digits (numbers from 0-9)
# "+" = One or more occurrences
search = re.search("\d+", string).group() # Search

print(search) # Print Result

Output:

20

Get all Numbers:

import re # Import re Module


string = "hello my name is Mark i'm 20 years old. i have 300 cats" # String

find_all = re.findall("\d+", string) # Find All int

print(find_all) # Result

Output:

['20', '300']

Using isdigit() built-function

Loop Way:

# Define a string to be tested
string = "Hello my name is Mark i'm 20 years old. i have 300 cats"

# Split the string into a list of words
split_string = string.split()

# Initialize an empty list to store the extracted integers
our_integers = []

# Iterate through each word in the list
for i in split_string:
    # Check if the word is a digit using the isdigit() method
    if i.isdigit():
        # If the word is a digit, append it to the our_integers list
        our_integers.append(i)
    
# Print the list of extracted integers
print(our_integers)

Output:

['20', '300']

List comprehension:

# Define a string to be tested
string = "Hello my name is Mark i'm 20 years old. i have 300 cats"

# Use a list comprehension to extract integers from the string
interegs = [i for i in string.split() if i.isdigit()]

# Print the list of extracted integers
print(interegs)

 Output:

['20', '300']