6. 变量和命名

cars = 100
space_in_a_car = 4.0
drivers = 30
passengers = 90
cars_not_driven = cars - drivers
cars_driven = drivers
carpool_capacity = cars_driven * space_in_a_car
average_passengers_per_car = passengers / cars_driven

print "There are", cars, "cars available."
print "There are only", drivers, "drivers available."
print "There will be", cars_not_driven, "empty cars today."
print "we can transport", carpool_capacity, "people tpday."
print "We have", passengers, "to carpool today."
print "We need to put about", average_passengers_per_car, "in each car."

输出
There are 100 cars available.
There are only 30 drivers available.
There will be 70 empty cars today.
we can transport 120.0 people tpday.
We have 90 to carpool today.
We need to put about 3 in each car.