🐍 Program 139: Create Dictionary of Lowercase and Uppercase Letters

[iamAntimPal]

🐍 Program 139: Create Dictionary of Lowercase and Uppercase Letters

📌 Description

Write a function that creates a dictionary with each (key, value) pair being the (lowercase, uppercase) versions of a letter, respectively.

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💡 Code Example

def mapping(lst):
    return {letter: letter.upper() for letter in lst}

# Examples
print(mapping(["p", "s"]))  # ➞ { "p": "P", "s": "S" }
print(mapping(["a", "b", "c"]))  # ➞ { "a": "A", "b": "B", "c": "C" }
print(mapping(["a", "v", "y", "z"]))  # ➞ { "a": "A", "v": "V", "y": "Y", "z": "Z" }

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✅ Output

{'p': 'P', 's': 'S'}
{'a': 'A', 'b': 'B', 'c': 'C'}
{'a': 'A', 'v': 'V', 'y': 'Y', 'z': 'Z'}

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🧠 Explanation

• The function uses a dictionary comprehension to iterate over each letter in the input list.
• For each letter, it maps the lowercase letter (key) to its uppercase version (value).