Change language

Python | Extract numbers from string

|

Method # 1: Using comprehension list + isdigit () + split()
This problem can be solved with the split functions to convert the string to a list, and then a list comprehension which can help us iterate over the list and the isdigit function helps to deduce a digit from a string.

# Python3 code for demos
# getting numbers from a string
# using comprehension list + isdigit () + split ()

 
# initialization string

test_string = "There are 2 apples for 4 persons"

 
# print original line

print ( "The original string: " + test_string)

  
# using comprehension list + isdigit () + split ()
# getting numbers from a string

res = [ int (i) for i in test_string.split () if i.isdigit ()]

 
# print result

print ( "The numbers list i s: " + str (res))

Output:

 The original string: There are 2 apples for 4 persons The numbers list is: [2, 4] 

Method # 2: Using re.findall()
This particular problem can also be solved with Python regex, we can use findall function to check for numeric occurrences using the corresponding regex string.

Output:

 The original string: There are 2 apples for 4 persons The numbers list is: [2, 4] 

Shop

Learn programming in R: courses

$

Best Python online courses for 2022

$

Best laptop for Fortnite

$

Best laptop for Excel

$

Best laptop for Solidworks

$

Best laptop for Roblox

$

Best computer for crypto mining

$

Best laptop for Sims 4

$

Latest questions

NUMPYNUMPY

Common xlabel/ylabel for matplotlib subplots

12 answers

NUMPYNUMPY

How to specify multiple return types using type-hints

12 answers

NUMPYNUMPY

Why do I get "Pickle - EOFError: Ran out of input" reading an empty file?

12 answers

NUMPYNUMPY

Flake8: Ignore specific warning for entire file

12 answers

NUMPYNUMPY

glob exclude pattern

12 answers

NUMPYNUMPY

How to avoid HTTP error 429 (Too Many Requests) python

12 answers

NUMPYNUMPY

Python CSV error: line contains NULL byte

12 answers

NUMPYNUMPY

csv.Error: iterator should return strings, not bytes

12 answers


Wiki

Python | How to copy data from one Excel sheet to another

Common xlabel/ylabel for matplotlib subplots

Check if one list is a subset of another in Python

sin

How to specify multiple return types using type-hints

exp

Printing words vertically in Python

exp

Python Extract words from a given string

Cyclic redundancy check in Python

Finding mean, median, mode in Python without libraries

cos

Python add suffix / add prefix to strings in a list

Why do I get "Pickle - EOFError: Ran out of input" reading an empty file?

Python - Move item to the end of the list

Python - Print list vertically

# Python3 demo code
# getting numbers from a string
# using re.findall ()

import re

  
# initialization string

test_string = "There are 2 apples for 4 persons"

 
# print original string

print ( "The original string: " + test_string)

  
# using re.findall ()
# getting numbers from a string

temp = re.findall (r ’d +’ , test_string)

res = list ( map ( int , temp))

 
# print result

print ( "The numbers list is:" + str (res))