習題 5: 更多的變量和打印
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)
總結:
字符串格式化
|
格式 |
描述 |
|
%% |
百分號標記 |
|
%c |
字符及其ASCII碼 |
|
%s |
字符串 |
|
%d |
有符號整數(十進制) |
|
%u |
無符號整數(十進制) |
|
%o |
無符號整數(八進制) |
|
%x |
無符號整數(十六進制) |
|
%X |
無符號整數(十六進制大寫字符) |
|
%e |
浮點數字(科學計數法) |
|
%E |
浮點數字(科學計數法，用E代替e) |
|
%f |
浮點數字(用小數點符號) |
|
%g |
浮點數字(根據值的大小採用%e或%f) |
|
%G |
浮點數字(類似於%g) |
|
%p |
指針(用十六進制打印值的內存地址) |
|
%n |
存儲輸出字符的數量放進參數列表的下一個變量中 |
|
%r |
字符串 (採用repr()的顯示) |
自我測試:
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)
習題 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
運行結果:
Ex6_1.py (個人註釋理解)
#-*- coding:utf-8 -*-
x = "Thereare %d types of people." % 10 #將右邊雙引號的賦值給x，將10格式化輸出（有符號整數）
binary = "binary" #將binary賦值給binary
do_not = "don't" #將don't 賦值給 do_not
y = "Thosewho know %s and those who %s." % (binary,do_not) #將右邊雙引號的賦值給y,分別將binary,do_not格式化輸出（字符串）
print x
print y
print "Isaid: %r." %x #此處前面好理解，但是原x的雙引號成了單引號我需要再查查原因。
print "I also said: '%s'." % y
hilarious = False
joke_evaluation = "Isn't that joke so funny?! %r"
printjoke_evaluation % hilarious #兩者對比還是有區別的。
print joke_evaluation,hilarious
w = "Thisis the left side of ..." #此處後者存在一個空格
e =" a string with a rightside."
print w +e
print w ,e
