Week 1 - Data Types and Operators

# code style print("Hello") print(7 + 8) print(7 + 8*2) print(7/2 - 1) print(1 + 2 - 3*4/5)

0.1 + 0.1 + 0.1 # 0.1 is an approximation to 1/10

# Quiz 1: variable names medan_population = 2098000 # distinguish between # 1. variable # 2. assignment operator # 3. value z = 1 y = medan_population print(y) # what is printed?

# We can assign variables such as x = 1 y = 2 z = 3 # we can also assign variables in a compact way x, y, z = 1, 2, 3 print(z) # when assigning variables, use descriptive variable names a, b = 2068000, 261 c = a/b print(c)

medan_population, medan_area = 2068000, 261 medan_density = medan_population/medan_area print(medan_density)

# Pythonic my_height = 178 my_weight = 75 # Not Pythonic, but still works myHeight = 178 myWeight = 75

medan_population = 2068000 # in the year 2015 #medan_population = medan_population + 1000 # verbose way of doing way medan_population += 1000 print(medan_population)

# My electricity bills for the last three months have been $23, $32 and $64. # What is the average monthly electricity bill over the three month period? # Write an expression to calculate the mean, and use print() to view the result. # Write an expression that calculates the average of 23, 32 and 64 # Step 1: calculate the mean m1, m2, m3 = 23, 32, 64 avg = (m1+m2+m3)/3 # Step 2: use the print() function to display the result print(avg)

carrots = 24 rabbits = 8 crs_per_rabbit = carrots/rabbits rabbits = 12 crs_per_rabbit = carrots/rabbits print(crs_per_rabbit)

rio_population, rio_area = 6453682, 486.5 # Write code to compare the densities of these two cities # Find out if the population of San Fransisco is denser than that of Rio de Janeiro # (print either True or False) # TODO: compute the densities of the two cities san_francisco_population, sf_area = 864816, 231.89 san_francisco_pop_density = san_francisco_population / sf_area print(san_francisco_pop_density) rio_population, rio_area = 6453682, 486.5 rio_de_janairo_pop_density = rio_population / rio_area print(rio_de_janairo_pop_density) # TODO: write code that prints True if San Fransisco is denser than Rio de Janeiro, and False otherwise if san_francisco_pop_density > rio_de_janairo_pop_density: print("True") else: print("False")

print(True) # printing a Boolean print("True") # printing a String