Python None data type exercises with solutions

Python None Data Type [ 10 exercises with solution ]

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1. Write a Python function that takes a string as input and returns "None" if the string is empty, otherwise it returns the given string.
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2. Write a Python function that returns the middle character of a string or "None" if the string length is odd.
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3. Write a Python program that iterates through a list of strings and prints each string. If a string is empty, print "Empty string" instead.
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4. Write a Python function that checks if a given list is sorted in descending order. Return None if the list is empty.
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5. Write a Python program that takes a user's input and converts it to uppercase. If the input is empty, return None.
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6. Write a Python program that defines a dictionary and retrieves a value using a key. If the key is not found, return None.
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7. Write a Python function that counts None values in a list recursively. Return 0 if the list is empty.
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8. Write a Python function that takes two arguments and returns their sum if both aren't None, otherwise return None.
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9. Write a Python function that takes a list and returns a new list with None inserted between each element.
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10. Write a Python function that replaces all occurrences of a substring in a string with another substring. Returns None if the original string is empty.
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