Python string | ascii_uppercase

In Python3, ascii_uppercase is a pre-initialized string used as a string constant. In Python, the 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 the string library function to use ascii_lowercase.

Code #1 :

Python3

# 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.

Python3

# 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.

Python3

# 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