ascii_letters in Python

Last Updated : 23 Oct, 2020

In Python3, ascii_letters is a pre-initialized string used as string constant.
ascii_letters is basically concatenation of ascii_lowercase and ascii_uppercase string constants. Also, the value generated is not locale-dependent, hence, doesn’t change.

Syntax :

string.ascii_letters

Note : Make sure to import string library function inorder to use ascii_letters.

Parameters :

 Doesn't take any parameter, since it's not a function.

Returns :

 Return all ASCII letters (both lower and upper case)

Code #1 :

# import string library function 
import string 
  
# Storing the value in variable result 
result = string.ascii_letters 
  
# Printing the value 
print(result) 

Output :

abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ

Code #2 :
Given code checks if the string input has only ASCII characters or not.

# importing string library function 
import string 
  
# Function checks if input string 
# has only ascii letters or not 
def check(value): 
    for letter in value: 
          
        # If anything other than ascii 
        # letter is present, then return 
        # False, else return True 
        if letter not in string.ascii_letters: 
            return False
    return True
  
# Driver Code 
input1 = "GeeksForGeeks"
print(input1, "--> ",  check(input1)) 
  
input2 = "Geeks for Geeks"
print(input2, "--> ", check(input2)) 
  
input3 = "Geeks_for_geeks"
print(input3, "--> ", check(input3)) 

Output :

GeeksForGeeks -->  True
Geeks for Geeks -->  False
Geeks_for_geeks -->  False

Applications :
The string constant ascii_letters can be used in many practical applications.
Let’s see a code explaining how to use ascii_letters to generate strong random passwords of given size.

Code #1 :

# Importing random to generate 
# random string sequence 
import random 
  
# Importing string library function 
import string 
  
def rand_pass(size): 
      
    # Takes random choices from 
    # ascii_letters and digits 
    generate_pass = ''.join([random.choice( 
                        string.ascii_letters + string.digits) 
                        for n in range(size)]) 
                          
    return generate_pass 
  
# Driver Code  
password = rand_pass(10) 
print(password) 
      
    

Output :

oQjI5MOXQ3

Note : Above given code will print random (different) password everytime, for the size provided.

Code #2 :
Say if you want to generate random password, but from the set of given string. Let’s see how can we do this using ascii_letters :

# Importing random to generate 
# random string sequence 
import random 
  
# Importing string library function 
import string 
  
def rand_pass(size, scope = string.ascii_letters + string.digits): 
      
    # Takes random choices from ascii_letters and digits 
    generate_pass = ''.join([random.choice(scope) 
                             for n in range(size)]) 
                         
    return generate_pass 
  
# Driver Code  
password = rand_pass(10, 'Geeks3F0rgeeKs') 
print(password) 

Output :

kg3g03keG3

abhishek1

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ascii() in Python

ascii_letters in Python

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