详解Python中的变量及其命名和打印

yipeiwu_com5年前Python基础

在程序中,变量就是一个名称,让我们更加方便记忆。

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." 


提示:下划线一般用在变量名中表示假想的空格。让变量名的可读性高一点。

运行结果:

root@he-desktop:~/mystuff# python ex4.py 
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 in each car.
root@he-desktop:~/mystuff# 


更多的变量和打印
现在我们输入更多的变量并打印他们,通常我们用""引住的叫字符串。

字符串是相当方便的,在练习中我们将学习怎么创建包含变量的字符串。有专门的方法将变量插入到字符串中,相当于告诉Python:“嘿,这是一个格式化字符串,把变量放进来吧。”

输入下面的程序:

# -- coding: utf-8 -- 
my_name = 'Zed A. Shaw' 
my_age = 35 # 没撒谎哦 
my_height = 74 # 英寸 
my_weight = 180 # 磅 
my_eyes = 'Blue' 
my_teeth = 'White' 
my_hair = 'Brown' 

  

print "let's talk about %s." % my_name 
print "He's %d inches tall." % my_height 
print "He's %d pounds heavy." % my_weight 
print "Actually that's not too heavy." 
print "He's got %s eyes and %s hair." % (my_eyes, my_hair) 
print "His teeth are usually %s depending on the coffee." % my_teeth 


# 下面这行比较复杂,尝试写对它。 
print "If I add %d, %d, and %d I get %d." % ( 
  my_age, my_height, my_weight, my_age + my_height + my_weight) 


提示:如果有编码问题,记得输入第一句。

运行结果:

root@he-desktop:~/mystuff# python ex5.py
let's talk about Zed A. Shaw.
He's 74 inches tall.
He's 180 pounds heavy.
Actually that's not too heavy.
He's got Blue eyes and Brown hair.
His teeth are usually White depending on the coffee.
If I add 35, 74, and 180 I get 289.
root@he-desktop:~/mystuff# 

相关文章

Python 类,property属性(简化属性的操作),@property,property()用法示例

本文实例讲述了Python 类,property属性(简化属性的操作),@property,property()用法。分享给大家供大家参考,具体如下: property属性的创建方式有两...

Python ftp上传文件

以下代码比较简单,对python实现ftp上传文件相关知识感兴趣的朋友可以参考下 #encoding=utf8 from ftplib import FTP #加载ftp模块 IP...

python多任务之协程的使用详解

1|0使用yield完成多任务 import time def test1(): while True: print("--1--") time.sleep(0.5)...

selenium+python实现自动化登录的方法

Selenium Python 提供了一个简单的API 便于我们使用 Selenium WebDriver编写 功能/验收测试。 通过Selenium Python的API,你可以直观地...

Python 获取命令行参数内容及参数个数的实例

执行python脚本的时候,有时需要获取命令行参数的相关信息。C语言通过argc和argv来获取参数的个数和参数的内容,python中通过sys模块的argv来获取参数的内容,使用len...