变量和命名
变量是用来指代某个东西的名字
是赋值，==是检查左右是否相等
x=100,x = 100，是否加空格都是可以的，但是加上空格会让代码更容易读
import math
cars=100#=的作业是将数值100赋值给cars，也为数值
space_in_a_car=4.0#用了浮点数
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.")
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执行结果
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.