ex4.py

 1 cars = 100 #一百輛車
 2 space_in_a_car = 4.0#每輛車可以坐四個人
 3 drivers = 30#30個司機
 4 passengers = 90#90個乘客
 5 cars_not_driven = cars-drivers#沒開的車=車輛數-司機數量
 6 car_drivern = drivers#已開的車=司機數量
 7 carpool_capacity = car_drivern*space_in_a_car #每輛車可以裝的人=司機*乘客數量
 8 average_passengers_per_car = passengers/car_drivern#
 
平均每輛車的乘客=乘客數/已經開的車數量
 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.我在程式裡用了4.0作為space_in_a_car的值，這樣做有必要嗎？如果只用4會發生什麼？

我覺得沒什麼區別。大概沒學過程式設計的有必要。

2.記住4.0是個浮點數。

3.註釋。

4.=和==的區別：

=：右邊賦值給左邊

==：檢查左右是否相等