[Type B] Working with Functions – Chapter 3 Sumita Arora

13. Draw the entire environment, including all user-defined variables at the time line 10 is being executed.

def sum(a, b, c, d):
    result = 0
    result = result + a + b + c + d
    return result

def length():
    return 4

def mean(a, b, c, d):
    return float(sum(a, b, c, d)) / length()

print(sum(a, b, c, d), length(), mean(a, b, c, d))

Solution: Let’s list down the variables and their values at line 10:

• Variables:
  • a, b, c, d: These variables are used as parameters in the function calls. Their values are not explicitly provided in the code snippet, so we cannot determine their values.
  • result: This variable is used in the sum function. Its value is initially set to 0, and then it’s assigned the result of the sum of a, b, c, and d.
  • length(): This is a function call that returns the value 4.
  • mean(): This is a function call that calculates the mean using the values of a, b, c, and d.

Therefore, at line 10, the variables a, b, c, d are still undefined, and the variable result contains the sum of a, b, c, and d calculated in the sum function. The function length() returns 4, and the function mean() is called with the parameters a, b, c, d.