Python Programs

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Python Programs - Conditional Statements

Check if a character is uppercase, lowercase, digit, or special character - Python Program

Example 1 :

ch = input("Enter a character: ")

if ch.isupper():
    print("Uppercase")
elif ch.islower():
    print("Lowercase")
elif ch.isdigit():
    print("Digit")
else:
    print("Special character")

 
OUTPUT 1 :
Enter a character: A
Uppercase 

OUTPUT 2 :
Enter a character: a
Lowercase

OUTPUT 3 :
Enter a character: 1
Digit

OUTPUT 4 :
Enter a character: @
Special character

Example 2 :

import string

def classify_character(char):
    """
    Classifies a single character as uppercase, lowercase, digit, or special character.

    Args:
        char (str): The character to classify.

    Returns:
        str: A description of the character type.
    """
    if len(char) != 1:
        return "Input must be a single character."

    if char.isupper():
        return f"'{char}' is an UPPERCASE letter."
    elif char.islower():
        return f"'{char}' is a LOWERCASE letter."
    elif char.isdigit():
        return f"'{char}' is a DIGIT."
    elif char in string.punctuation or char.isspace():
        return f"'{char}' is a SPECIAL character (or whitespace)."
    else:
        return f"'{char}' is an UNKNOWN type of character."

# Get input from the user
user_input = input("Enter a single character: ")

# Classify and print the result
result = classify_character(user_input)
print(result)

 
OUTPUT 1 :
Enter a single character: A
'A' is an UPPERCASE letter.

OUTPUT 2 :
Enter a single character: a
'a' is a LOWERCASE letter.

OUTPUT 3 :
Enter a single character: 1
'1' is a DIGIT.

OUTPUT 4 :
Enter a single character: @
'@' is a SPECIAL character (or whitespace).

Explanation

import string:

This line imports the string module, which provides access to useful string constants, including string.punctuation (a string containing all common special characters).

classify_character(char) function:

• Takes a single argument char, which is the character to be classified.
• Input Validation: if len(char) != 1:checks if the input is indeed a single character. If not, it returns an error message.
• isupper(): This built-in string method returns Trueif the character is an uppercase letter, False otherwise.
• islower(): This built-in string method returns Trueif the character is a lowercase letter, False otherwise.
• isdigit(): This built-in string method returns Trueif the character is a digit (0-9), False otherwise.
• char in string.punctuation or char.isspace(): This checks if the character is present in the punctuationset (e.g., !, @, #) or if it's a whitespace character (e.g., space, tab, newline) using char.isspace().
• else: If none of the above conditions are met, the character is classified as an "UNKNOWN type of character."

User Input and Output:

• user_input = input("Enter a single character: ")prompts the user to enter a character.
• result = classify_character(user_input)calls the function to classify the input.
• print(result)displays the classification result to the user.