Python string | ascii_uppercase
Last Updated :
11 Jul, 2025
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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 :
# 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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