python 笔记 转义序列与简单无限循环——12.24

习题9：打印，打印，打印

话不多说，先熟悉下手感

 

ex9.py

# -*- coding: utf-8-*-

# Here's some new strange stuff,remember type it exactly.

 

days ="Mon Tue Wed Thu Fri SatSun"

months = "Jan\nFeb\nMar\nApr\nMay\nJun\nJul\nAug"

 

print "Here are the days: ", days

print "Here are the months: ", months

 

print """

There's something going on here.

With the three double-quotes.

We'll be able to type as much as welike.

Even 4 lines if we want, or 5, or 6.

"""

 

 

运行结果:

 

 

感悟与自我测试:

学习到了2个知识点：

1：\n表示换行

2：打印一段话，前后均用"""符号包裹住就好。

 

ex9_1.py

#-*- coding: utf-8-*-

name ="Jack Mary Kitty BlackTom"

hobbies = "singingg\nruningg\nclimbing"

 

print "I have some good friends.\nThey are" +name

print "In the weekend, I will do some thing:",hobbies 

print "Inthe weekend, I will do some thing:"+hobbies   #此处对比，+好和逗号看起来区别不大，本质上讲+表连接，逗号表分隔参数

 

运行结果:

 

 

 

 

 

习题 10:  那是什么？

上一个练习就是两种让字符串扩展到多行的方法：使用\n和转义符（转义序列）

 

ex10.py

# -*- coding: utf-8-*-

tabby_cat = "\tI'm tabbledin."

persian_cat = "I'm split\non aline."

backslash_cat = "I'm \\ a \\ cat."

 

fat_cat = """

I'll do a list:

\t* Cat food

\t* Fishies

\t* Catnip\n\t* Grass

"""

 

print tabby_cat

print persian_cat

print backslash_cat

print fat_cat

 

运行结果:

 

 

 

 

ex10_1.py

# -*- coding: utf-8-*-

tabby_cat = "\tI'm tabbled in."   #水平制表符，初始占据第八列

persian_cat = "I'm split\non a line."  #换行符号

backslash_cat = "I'm \\ a \\ cat."     #\\表示一个字符串斜杠

 

fat_cat = """

I'll do a list:  

\t* Cat food

\t* Fishies

\t* Catnip\n\t* Grass

"""

#水平制表符，初始占据第八列

 

 

print tabby_cat

print persian_cat

print backslash_cat

print fat_cat

 

while True:

for i in["/","-","|","\\","|"]:

print "%s \r" % i,

 

#结果很好玩，出现一个| 一直转，貌似是一个简单的无限循环，将I中的定义字符串一直回车，挨个循环输出貌似就形成了一直转的状态，实际是挨个输出形成的视觉错误（个人感觉）

 

运行结果: