笨办法学Python（learn python the hard way）--练习程序1-10

下面是当初看这本书时按照书中的代码做的练习，一行一行敲下来的，都已经试运行过，没有错误（基于python3），练习1-练习10

#ex1.py
1 #print("Hello world!")
2 print("Hello again")
3 print("I like typing this.")
4 print("This is fun.")
5 print('Yay!Printing.')
6 print("I'd much rather you 'not'.")
7 print('I "said" do not touch this.')
8 print('')

#ex2.py
1 # A comment, this is so you can read your program later.
 # Anything after the # is ignored by python.

 print("I could have code like this.") # and the comment after is ignored)

 # You can also use a comment to "disable"or comment out a piece of code:
 # print("This won't run.")

 print("This will run.")

 #ex3.py
 1 print("I will now count my chickens:")

 print("Hens",25+30/6)
 print("Poosters",100-25*3%4)

 print("Now I will count the eggs:")

 print(3+2+1-5+4%2-1//4+6)

 print("Is it true that 3+2<5-7?")

 print(3+2<5-7)

 print("What is 3+2?",3+2)
 print("What is 5-7?",5-7)

 print("Oh,that's why it's False.")

 print("How about some more.")

 print("Is it greater?",5 > -2)
 print("Is it greater or equal?",5 >= -2)
 print("Is it less or equal?",5 <= -2)

 #ex4.py
 1 #给变量cars赋值为100
 cars = 100
 #给变量space_in_a_car赋值为4.0
 space_in_a_car = 4
 #给变量drivers赋值为30
 drivers = 30
 #给变量passengers赋值为90
 passengers = 90
 cars_not_driven = cars - drivers
 cars_driven = drivers
 carpool_capacity = cars_driven * space_in_a_car
 average_passengers_per_car = passengers // cars_driven

 print("There are",cars,"cars available.")
 print("There are only",drivers,"drivers available.")
 print("There will be",cars_not_driven,"empty cars today.")
 print("We can transport",carpool_capacity,"people today.")
 print("We have",passengers,"to carpool today.")
 print("We need to put about",average_passengers_per_car,"in each car.")

 #ex5.py
 1 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("His teeth are usually %s depending on the coffee."% my_teeth)

 # this line is tricky,try to get it exactly right
 print("If I add %d,%d,and %d I get %d."%(my_age,my_height,my_weight,my_age+my_height+my_weight))

 #ex6.py
 1 x = "There are %d types of people."%10
 binary = "binary"
 do_not = "don't"
 y = "Those who know %s and those 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 right side."

 print(w+e)

 #ex7.py
 1 print("Mary had a little lamb.")
 print("Its fleece was white as %s."%'snow')
 print("And everywhere that Mary went.")
 print("."*10) # what'd that do?

 end1 = "C"
 end2 = "h"
 end3 = "e"
 end4 = "e"
 end5 = "s"
 end6 = "e"
 end7 = "B"
 end8 = "u"
 end9 = "r"
 end10 = "g"
 end11 = "e"
 end12 = "r"

 # watch that comma at the end. try removing it to see what happens

 print(end1+end2+end3+end4+end5+end6,end=" ")
 print(end7+end8+end9+end10+end11+end12)

 #ex8.py
 1 formatter = "%r %r %r %r"

 print(formatter %(1,2,3,4))
 print(formatter %("one","two","three","four"))
 print(formatter %(True,False,False,True))
 print(formatter %(formatter,formatter,formatter,formatter))
 print(formatter %(
 "I had this thing.",
 "That you could type up right.",
 "But it didn't sing.",
 "So I said goodnight."
 ))

 #ex9.py
 1 # Here's some new strange stuff,remember type it exactly.

 days = "Mon Tue Wed Thu Fri Sat Sun"
 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 we like.
 Even 4 lines if we want,or 5,or 6.
 """)

 #ex10.py
 1 tabby_cat = "\tI'm tabbed in."
 persian_cat = "I'm split\non a line."
 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)