笨方法学python - 04

四、变量（variable）和命名

　变量作用：用来指代某个东西的名字，更易于记住程序的名字

　输入：

cars = 100
space_in_a_car = 4
drivers = 30
passengers = 90
cars_not_driven = cars - drivers
cars_driven = drivers
carpool_capacity = cars_driven * space_in_a_car
average_passengers_per_car = round(passengers / cars_driven)

print('There are',cars,'cars avaliable.')
print('There are only',drivers,'drivers avaliable.')
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.')

　　

　结果：

There are 100 cars avaliable.
There are only 30 drivers avaliable.
There will be 70 empty cars today.
We can transport 120 people today.
We have 90 to carpool today.
We need to put about 3 in each car.

　

　_ 是下划线字符（underscore），此符号在变量中通常被用作假想空格，用来隔开单词

　= single-equal，用于将右边的值赋予左边的变量名
　== double-equal，相当于等于号