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( )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。