Environment Diagrams: basic-level questions

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Environment Diagrams

Question 1

def square1(x):
    return x * x

def square2(x):
    print(x * x)

a = square1(3)
b = square2(3)

# How does return behave differently than print?

Question 2

def square(x):
    return x * x

def sum_of_squares(x, y):
    return square(x) + square(y)

result = sum_of_squares(3, 4)

# How many times do we call mul?
# How many frames do we draw for mul?

Question 3

from operator import add
first = add(3, 4)

def add(a, b):
    return a + b

second = add(3, 4)

# What changes between the first time we call add and the
# second time? How does this affect our diagram?

Question 4

score, opp_score = 0, 0

def assign(arg0, arg1):
    score = arg0
    opp_score = arg1
    return True

success = assign(3, 9001)

# But did we really succeed?
# Did the global values of score and opp_score change?

Question 5

goal = 100

def foo(x):
    y = x + goal
    return b

result = foo(4)

# What's the lookup procedure for goal?
# Does result ever show up in the diagram?

Question 6

from operator import add, sub
def a_plus_abs_b(a, b):
    if b < 0:
        op = sub
        op = add
    return op(a, b)

result = a_plus_abs_b(4, -4)