Change language

Python | Remove all characters except letters and numbers

|

String manipulation — a very important task in day to day programming and web development. Most of the requests and responses in HTTP requests are presented as strings with sometimes useless data that we need to delete. Let’s discuss some Pythonic ways to remove all characters except numbers and alphabets.

Method # 1: Using re.sub

# Python code for demos
# remove all characters
# except numbers and alphabets

 

import re

 
# initialization string

ini_string = " 123abcjw :,. @! eiw "

 
# print the original line  

print ( "initial string:" , ini_string)

 
# function for demonstrations of removing characters
# which are not numbers and alphabets using re

 

result = re.sub ( ’[W _] +’ , ’’, ini_string)

  
# print the final line

print ( "final string" , result)

Exit:

 initial string: 123abcjw :,. @! eiw final string 123abcjweiw 

Method # 2: Using isnumeric ()

# Python code for demonstration
# remove all characters
# except numbers and alphabets

 

import re

 
# initializing string

ini_string = "123abcjw :,. @! eiw "

  
# print the original line

print ( " initial string: " , ini_string)

  
# function to demonstrate removal of characters
# which are not numbers and alphabets using re

getVals = list ( [val for val in ini_string

  if val .isalpha () or val.isnumeric ()])

 

result = " ". join (getVals)

  
# print the final line

print ( "final string" , result)

Exit:

 initial string: 123abcjw :,. @! eiw final string 123abcjweiw 

Method # 3: Using isalnum/ rel=noopener target=_blank> alnum ()

# Python code for demo
# remove all characters
# except numbers and alphabets

 
# initializing string

ini_string = "123abcjw :,. @! eiw"

 
# print the original line

print ( "initial string:" , ini_string)

  
# function to demonstrate removal of characters
# which are not numbers and alphabets using re

getVals = list ([val for val in ini_string if val.isalnum ()])

result = "". join (getVals)

 
# print the final line

print ( "final string" , result )

Exit:

 initial string : 123abc jw :,. @! eiw final string 123abcjweiw 

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

News


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