Convert a letter to upper case

Write a function lower_to_upper which receives as a parameter a lowercase letter and returns that same character, uppercase. To do this you must use the functions chr y ord. If the letter does not belong to the lowercase alphabet, it must be returned the same letter.

Remember that:

• chr: returns the character corresponding to an integer within the ASCII table. The ASCII table is based on the international alphabet with all 26 letters. The first letter 'a' esta en la posición 97, por eso chr(97) returns 'a' and 25 characters later (i.e. 97 + 25 = 122) is the chr(122), that returns 'z'.

• ord: returns the integer value of a character in the ASCII table. Capital letters of the international alphabet range from ord("A"), that returns 65, to ord("Z"), that returns 90.

This is the last time we give you the pytests that you can use to test your function. From now on you will have to do it yourself.

@pytest.mark.parametrize("testcase, input, expected_output",[(1, 'a', 'A'), (2, 'z', 'Z'), (3, 'ñ', 'Ñ'), (4, '\*', '\*'), (5, 'Q', 'Q'), (6, ' ] )

def test_lower_to_upper(testcase, input, expected_output): 
    assert lower_to_upper(input) == expected_output, "case 0".format(testcase)

Insist that the students test their programs by giving them example
pytests.