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Python Programs - Functions

Function to count the number of uppercase and lowercase letters - Python Program

Example 1 :

Python 
def count_case(s):
    """Count uppercase and lowercase letters."""
    upper = sum(1 for ch in s if ch.isupper())
    lower = sum(1 for ch in s if ch.islower())
    return upper, lower

print(count_case("Hello World"))

Output

 
OUTPUT  :
(2, 8)

Example 2 : Advanced Program

Python 
def count_case_letters(input_string):
    """
    Counts the number of uppercase and lowercase letters in a string.

    Args:
        input_string: The string to analyze.

    Returns:
        A tuple containing two integers: (uppercase_count, lowercase_count).
    """
    uppercase_count = 0
    lowercase_count = 0

    for char in input_string:
        if char.isupper():
            uppercase_count += 1
        elif char.islower():
            lowercase_count += 1

    return uppercase_count, lowercase_count

# Example Usage:
text = "Hello World! 123"
upper, lower = count_case_letters(text)

print(f"Original string: '{text}'")
print(f"Number of uppercase letters: {upper}")
print(f"Number of lowercase letters: {lower}")

Output

 
OUTPUT  :
Original string: 'Hello World! 123'
Number of uppercase letters: 2
Number of lowercase letters: 8

Explanation:

count_case_letters(input_string) function:

  • This function takes one argument, input_string, which is the string to be processed.
  • It initializes two variables, uppercase_countand lowercase_count, to 0. These variables will store the respective counts.
  • The code then iterates through each charin the input_string.
  • Inside the loop, isupper()checks if the current character is an uppercase letter. If true, uppercase_count is incremented.
  • elif char.islower()checks if the character is a lowercase letter. If true, lowercase_count is incremented. Characters that are neither uppercase nor lowercase (e.g., numbers, spaces, punctuation) are ignored.
  • Finally, the function returns a tuple containing uppercase_countand lowercase_count.

 

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