python 手记9 〖笨方法学python习题30〗

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欢迎一起讨论技术问题！

people = 30
cars = 40
buses = 15

if cars > people:
print "We shoule take the cars."
elif cars < people:
print "We shoule not take the cars."
else:
print "We can't decide."

if buses > cars:
print "That's too many buses."
elif buses < cars:
print "Maybe we could take the buses."
else :
print "We still can't decide."

if people > buses:
print "Alright, let's just take the buses."
else:
print "Fine, let's stay home then."

习题重点

elif——elif相当于是否则如果的意思(后面还需要加上条件,跟if一样的)

else——else相当于是否则的意思

可以说这些命令很像文字游戏里的分支剧情，就是给你几个选项让你点，每个都会出现不同的情况，很像吧？

So，我才没加注释，如果想看注释下来吧！

people = 30 #创建变量
cars = 40 #创建变量
buses = 15 #创建变量

if cars > people: #遇到True就打印下面的内容
print "We shoule take the cars."
elif cars < people: #如果cars小于people就跳过，否则打印下面的内容。
print "We shoule not take the cars."
else: #以上的True条件都不行，否则就打印下面内容
print "We can't decide."

if buses > cars: #如果buses大于cars，就打印下面的内容。
print "That's too many buses."
elif buses < cars: #如果buses小于cars，否则打印下面
4000
的内容
print "Maybe we could take the buses."
else: #上面两个命令被执行了，如果没。就打印下面的内容
print "We still can't decide."

if people > buses:
print "Alright, let's just take the buses."
else:
print "Fine, let's stay home then."

就是这样的，我也有点不懂，还是问别人的。

大胆设想：

我在打代码时想到了一个问题，if语句下面的内容可不可以换成其他的函数，于是我就开始了

联想“写入文件”

# -*- coding: utf-8 -*-
a1 = 1111
b1 = 4000
print "%s, %s" % (a1, b1)

if a1 < b1:
print "The Numbers are really big, but then I'm going to make you crazy!Enter the text!"

from sys import argv
script, filename = argv  #将argv解包，然后将值依次赋于左边的的值不能讲script丢掉，然后后面的参数随你改

print "We're going to erase %r." % filename #打印从argv解包解出的变量filename�?r大家都应该知�?
print "If you don't want that, hit CTRL-C (^C)." #打印，后面的“CTRL-C(^C)”不要管
print "If you do want that, hit RETURN." #打印

raw_input("?") #raw_input指令让用户输入值，（里面是给用户的提示�?

print "Opening the file..." #打印

target = open(filename, 'w')  #打开用户输入的文�?0
print "Truncating the file. Goodbye!" #打印
target.truncate() #清空该文件，反正你创建的也是新文�?
print "Now I'm going to ask you for three lines."  #打印

line1 = raw_input("line 1: ")  #让用户输入值然后赋给变量line1
line2 = raw_input("line 2: ")  #让用户输入值然后赋给变量line2
line3 = raw_input("line 3: ")  #让用户输入值然后赋给变量line3
line4 = raw_input("line 4: ")  #让用户输入值然后赋给变量line4
print "I'm going to write these to the file." #打印 I‘m going to write these to the file."

lines = "%s\n%s\n%s\n%s\n" % (line1, line2, line3, line4)
target.write(lines)

print "And finally, we close it." #打印And finally, we close it
target.close() #将刚刚输入的字符串都保存在text.txt文件�?

其实还有很多，但我实在不行啦！