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Python string | ascii_uppercase

  • Difficulty Level : Basic
  • Last Updated : 16 Oct, 2018

In Python3, ascii_uppercase is a pre-initialized string used as string constant. In Python, string ascii_uppercase will give the uppercase letters ‘ABCDEFGHIJKLMNOPQRSTUVWXYZ’.

Syntax : string.ascii_uppercase

Parameters: Doesn’t take any parameter, since it’s not a function.

Returns: Return all uppercase letters.

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



Code #1 :




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

Output :

ABCDEFGHIJKLMNOPQRSTUVWXYZ

 

Code #2 : Given code checks if the string input has only upper ASCII characters.




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

Output:

GeeksForGeeks -->  False
GEEKS FOR GEEKS -->  False
GEEKSFORGEEKS -->  True

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




# 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_uppercase + string.digits) 
                        for n in range(size)]) 
                            
    return generate_pass 
    
# Driver Code  
password = rand_pass(10
print(password) 
      

Output:

TR2ESZAJOT

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