python 笔记 更多的变量和字符串(string) ——12.22

习题 5: 更多的变量和打印
 

ex5.py

 

my_name = 'Zed A. Shaw'

my_age = 35
# not a lie

my_height = 74
# inches

my_weight = 180
# lbs

my_eyes = 'Blue'

my_teeth = 'White'

my_hair = 'Brown'

 

print "Let's talk about %s."
%my_name

print "He's %d inches tall."
%my_height

print "He's %d pounds heavy."
%my_weight

print "Actually that's not too heavy."

print "He's got %s eyes and %s hair."
%(my_eyes, my_hair)

print "His teeth are usually %s depending on the coffee."
%my_teeth

 

# this line is tricky, try to get itexactly right
print "If I add %d, %d, and %d I get %d."
%(

my_age, my_height, my_weight, my_age
+ my_height + my_weight)

 


 
 

 

总结:

字符串格式化

格式	描述
%%	百分号标记
%c	字符及其ASCII码
%s	字符串
%d	有符号整数(十进制)
%u	无符号整数(十进制)
%o	无符号整数(八进制)
%x	无符号整数(十六进制)
%X	无符号整数(十六进制大写字符)
%e	浮点数字(科学计数法)
%E	浮点数字(科学计数法，用E代替e)
%f	浮点数字(用小数点符号)
%g	浮点数字(根据值的大小采用%e或%f)
%G	浮点数字(类似于%g)
%p	指针(用十六进制打印值的内存地址)
%n	存储输出字符的数量放进参数列表的下一个变量中
%r	字符串 (采用repr()的显示)

 

 

 

自我测试:

 

ex5.1.py

tt =13.555

my_weight = 170
# lib

pounds = 0.453
*my_weight

 

print "you have %6.2f apples"
%tt

print "you have %3.2f apples"
%tt

print "you have %2.1f apples"
%tt

print "you have %1.1f apples"
%tt

print "you are %d pounds or %3.3f kg heavy."
%(my_weight,pounds)

 
 


 
 
 

习题 6: 字符串(string) 和文本
 

ex6.py

 

x ="There are %d types ofpeople."
% 10

binary = "binary"

do_not = "don't"

y ="Those who know %s andthose who %s."
% (binary, do_not)

 

print x

print y

 

print "I said: %r."
% x

print "I also said: '%s'."
% y

 

hilarious = False

joke_evaluation = "Isn't that joke so funny?! %r"

 

print joke_evaluation
% hilarious

 

w ="This is the left side of..."

e =" a string with a rightside."

 

print w +e

 

运行结果:

 


 

 

Ex6_1.py  (个人注释理解)

#-*- coding:utf-8 -*-
x = "Thereare %d types of people."
% 10
#将右边双引号的赋值给x，将10格式化输出（有符号整数）

binary = "binary"
#将binary赋值给binary

do_not = "don't" 
#将don't
赋值给 do_not

y = "Thosewho know %s and those who %s."
% (binary,do_not)
#将右边双引号的赋值给y,分别将binary,do_not格式化输出（字符串）

 

print x

print y

 

print "Isaid: %r."
%x  #此处前面好理解，但是原x的双引号成了单引号我需要再查查原因。

print "I also said: '%s'."
% y

 

hilarious = False

joke_evaluation = "Isn't that joke so funny?! %r"

 

printjoke_evaluation
% hilarious  #两者对比还是有区别的。

print joke_evaluation,hilarious

 

w = "Thisis the left side of ..." #此处后者存在一个空格

e =" a string with a rightside."

 

print w +e

print w ,e