笨办法学python习题4

ex4.py

 1 cars = 100 #一百辆车
 2 space_in_a_car = 4.0#每辆车可以坐四个人
 3 drivers = 30#30个司机
 4 passengers = 90#90个乘客
 5 cars_not_driven = cars-drivers#没开的车=车辆数-司机数量
 6 car_drivern = drivers#已开的车=司机数量
 7 carpool_capacity = car_drivern*space_in_a_car #每辆车可以装的人=司机*乘客数量
 8 average_passengers_per_car = passengers/car_drivern#平均每辆车的乘客=乘客数/已经开的车数量
 9 
10 
11 print("There are",cars,"cars available.")
12 print("There are only",drivers,"drivers available.")
13 print("There will be",cars_not_driven,"empty cars today.")
14 print("We can transport",carpool_capacity,"people today.")
15 print("We have",passengers,"to carpool today.")
16 print("We need to put about",average_passengers_per_car,"in each car.")

1.我在程序里用了4.0作为space_in_a_car的值，这样做有必要吗？如果只用4会发生什么？

我觉得没什么区别。大概没学过编程的有必要。

2.记住4.0是个浮点数。

3.注释。

4.=和==的区别：

=：右边赋值给左边

==：检查左右是否相等