Question: phython program Write a Python function called to upper that accepts a string as parameter. Then the function calls the is_lower (from problem 2) to

phython program phython program Write a Python function called to upper that accepts a

Write a Python function called to upper that accepts a string as parameter. Then the function calls the is_lower (from problem 2) to determine if all the characters in the string are in lower case. If the return value from is_lower is False, then the to_upper function returns an empty string. Otherwise, converts all the characters in the string to upper case and returns it. Sample Input: to_upper("abcd") Output: ABCD" Sample input: to_upper(ABcd) Output: un

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