Question: Exercise 7 Step 1: Create a new editor window and save it. Use lab5ex7.py as the file name. Step 2: Use the function design recipe

Exercise 7 Step 1: Create a new editor window and save it. Use lab5ex7.py as the file name. Step 2: Use the function design recipe to develop a function named blackjack. This function takes two positive integer values, a and b. The function returns whichever value is closest to 21 without being over 21. It returns 0 if both values are over 21. For example, if the values of a and b are 19 and 20, the function returns 20. If the values of a and b are 19 and 21, the function returns 21. If the values of a and b are 17 and 22, the function returns 17. Your function definition must have type annotations and a complete docstring. Use the Python shell to test your function. After you've finished testing, close the editor window for lab5ex7.py
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