笨办法学Python – 习题11-12
- 2020 年 2 月 10 日
- 筆記
目录
1、习题 11: 提问
学习目标:了解人机交互场景,熟悉raw_input 的用法。
1、在 Python2.x 中 raw_input( ) 和 input( ),两个函数都存在,具体区别详情请参考习题5,其中区别为:
- raw_input( ) 将所有输入作为字符串看待,返回字符串类型。
- input( ) 只能接收“数字”的输入,在对待纯数字输入时具有自己的特性,它返回所输入的数字的类型( int, float )。
2、在 Python3.x 中 raw_input( )和 input( ) 进行了整合,去除了 raw_input( ),仅保留了 input( ) 函数,其接收任意任性输入,将所有输入默认为字符串处理,并返回字符串类型。
习题十一中的练习代码是:
#! -*-coding=utf-8-*- print("How old are you?"), age = raw_input() print "How tall are you?", height = raw_input() print "How much do you weigh?", weight = raw_input() print "So, you're %r old, %r tall and %r heavy." % ( age, height, weight)
C:Python27python.exe D:/pythoncode/stupid_way_study/demo11/Exer11-1.py How old are you? 14 How tall are you? 34 How much do you weigh? 123 So, you're '14' old, '34' tall and '123' heavy. Process finished with exit code 0
上述代码有一个问题,就是每一个print 一句后面都有一个逗号,这是因为这样的话print 就不会输出新行符而结束这一行跑到下一行去了,具体详情用法请参考习题7。
2、习题 12: 提示别人
学习目标:继续学习raw_input 的用法,了解怎么添加提示信息。
习题十二中的练习代码是:
age = raw_input("How old are you? ") height = raw_input("How tall are you? ") weight = raw_input("How much do you weigh? ") print "So, you're %r old, %r tall and %r heavy." % (age, height, weight)
上述代码的运行结果为:
C:Python27python.exe D:/pythoncode/stupid_way_study/demo11/Exer11-1.py How old are you? 23 How tall are you? 45 How much do you weigh? 123 So, you're '23' old, '45' tall and '123' heavy. Process finished with exit code 0
了解一下pydoc的用法:
D:pythoncodestupid_way_studydemo11>python -m pydoc Exer11-1 How old are you? 12 How tall are you? 23 How much do you weigh? 123 So, you're '12' old, '23' tall and '123' heavy. Help on module Exer11-1: # 展示该文件具体内容 NAME Exer11-1 FILE d:pythoncodestupid_way_studydemo11exer11-1.py DESCRIPTION # print("How old are you?"), # age = raw_input() # # print "How tall are you?", # height = raw_input() # # print "How much do you weigh?", # weight = raw_input() # # print "So, you're %r old, %r tall and %r heavy." % ( # age, height, weight) DATA age = '12' height = '23' weight = '123'
pydoc是python自带的一个文档生成工具,使用pydoc可以很方便的查看类和方法结构
同时我们可以在本地开启端口,然后在浏览器端看源代码解释:
本地窗口使用命令python3 -m pydoc -p 1234 开启:

浏览器端可直接访问开放的端口:http://localhost:1234/

当然还可以在命令行下直接查看某一模块的源代码:
使用命令:python3 -m pydoc os

3、总结
这两题主要是学习了和计算机交互的函数raw_input() ,注意由于Python2中input() 自身的原因会导致一些问题,所以一般在Python2中只使用input(),然后学习了解pydoc的用法。
