python习题教程 全50个 EP4

习题四：变量和命名

程序代码：

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 today")
print("We have", passengers, "to carpool today.")
print("We need to put about", average_passengers_per_car, "in each car.")

应该看到的结果
There are 100 cars available.
There are only 30 drivers available.
There will be 70 empty cars today.
WE can transport 120.0 people today
We have 90 to carpool today.
We need to put about 3.0 in each car.

巩固练习：

1. 记住 4.0 是一个浮点数。 这只是一个带小数点的数。
2. 记住_是下划线字符