Problem 1: Reviewing Functions

def func1(x):
    for i in range(3):
        x *= 2
    return x + x

def func2(y, z):
    A = func1(y+1) % 8
    z, A = A + z, y
    return z ** A

Problem 2: The Boolean Expression

What would the below expression evaluate to?

True and not False or False and not (False or True or False) or False

My Shame

• I have straight up missed this in the past when teaching, and was gobsmacked last night when I realized
• Boolean operators absolutely have an order of operations:
  • Parentheses
  • not
  • and
  • or
• Only operations at the same “level” act left to right

Problem 3: Gridded Booleans

Problem 3b: Raising the Stakes

Problem 4: Being Smart

• Suppose you are writing a function to “control” a thermostat for an HVAC system
• Your function has two variables as input: current_temp and target_temp
  • If the two values are within 5 degrees, you should print “Off”
  • If the current temperature is less than the target, you should print “Heating”
  • If the current temp is greater than the target, you should print “Cooling”
• If they are separated by more than 25 degrees, you should also print “Warning: High Load!”
  • This is in addition to whichever of the three values you printed above

Multiples

• I want to write a function that takes a given number as input and prints all of its integer factors
  • As a reminder, a factor of a number is a value that evenly divides the number
• I want to return a count of how many factors were printed

A Solution

def print_factors_of(num):
    """Prints off all the integer factors of
    the provided number, and returns the count of
    them.
    
    Algorithm:
        Loop over all numbers less than num
        Check if factor by seeing if remainder is 0
        Print and increment counter if so
    """
    possible_factor = 1
    count = 0
    while possible_factor <= num:
        if num % possible_factor == 0: # Factor found!
            print(possible_factor)
            count += 1
        possible_factor += 1
    return count

print(print_factors_of(45632636))