ex24更多练

 1 #-*- coding: UTF-8 -*- 
 2 print "Let‘s practice everything."
 3 print ‘You\‘d need to know \‘bout escape with \\ that do \n newlines and \t tabs.‘
 4 
 5 poem = """
 6 \tThe lovely world
 7 with logic so firmly planted
 8 can not discern \n the needs of lovely
 9 nor comprehend passion from intuition
10 and requires an explaniation
11 \n\t\t where there is none.
12 """
13 
14 print "--------------------"
15 print poem
16 print "--------------------"
17 
18 five = 10 - 2 + 3 - 6
19 print "This should be five:%s" %five
20 
21 def secret_formula (started):#函数后面永远不记得加":"!!!!
22      jelly_beans = started * 500#这里出现了一个IndentationError:unexpected indent，这是由于下面那几个命令行没有对齐（要求几个tab和几个空格完全相同。解决方法：视图-显示符号-显示空格与制表符
23      jars = jelly_beans / 1000
24      crates = jars / 100
25      return jelly_beans,jars,crates#创建函数后，返回三个变量值
26      
27 start_point = 10000
28 beans,jars, crates = secret_formula(start_point)#这个有点类似argv的那个操作，把函数的最后三个变量给解压出来放到这三个新的变量里边。
29 #函数内部的变量都是临时的，当函数返回之后，返回值可以被赋予另一个变量。
30 print "With a starting point of:%d" % start_point
31 print "We‘d have %d beans, %d jars, and %d crates." %(beans, jars, crates)
32 
33 start_point = start_point / 10
34 
35 print "We can also do that this way:"
36 print "We‘d have %d beans, %d jars, and %d crates." % secret_formula(start_point)