笨办法学习Python3练习代码1-10

ex1.py

 print("hello world!",end = " ")#不换行
 print("hello again")
 print("I like typing this.")
 print("This is fun.")
 print("Yay!Printing.")
 print("I'd much rather you 'not'.")
 print('I "said" do not touch this.')
 print("")

ex2.py

 # 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 code:
 #print("This won't run.")
 print("This will run.")
 print("hi # there.")

 #  (#)的英文是octothorpe或者 pound character

ex3.py

 #数字和数学运算
 print("I will now count my chickens:")
 print("hens", 25 + 30 / 6)
 print("roosters", 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 eequal ?", 5 >= -2)
 print("Is it less or equal ?", 5 <= -2)

ex4.py

 #变量和命名

 #汽车数量
 cars = 100

 #每辆汽车的运载人数
 space_in_a_car = 4

 #司机人数
 drivers = 30

 #乘客人数
 passengers = 90

 #空车数量
 cars_not_driven = cars - drivers

 #占用的汽车数量
 cars_driven = drivers

 #最大可运输的人数
 carpool_capacity = cars_driven * space_in_a_car  #capacity=容积，carpool=拼车

 #平均每台汽车上的人数
 average_passengers_per_car = passengers / cars_driven

 print("there are ",cars,"cars available.")
 print("There are only",drivers,"drivers availlable.")
 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

 name = 'Zed A.Shaw'
 age = 35     #not a lie
 height = 74  #inches
 weight = 180 #lbs
 eyes = 'Blue'
 teeth = "White"
 hair = "Brown"

 print(f"Let's talk about {name}.")    #f代表格式化的意思format
 print(f"He's {height} inches tall.")
 print(f"He's {weight} pounds heavy.")
 print("Actually that's not too heavy.")
 print(f"He's got {eyes} eyes and {hair} hair.")
 print(f"His teeth are usually {teeth} depending on the coffee.")

 #this line is tricky, try to get it exactly right
 total = age + height + weight
 print(f"If I add {age}, {height}, and {weight}. I get {total}.") 

ex6.py

 tpyes_of_people = 10

 x = f"There are {tpyes_of_people} types of people."
 binary = "binary"
 do_not = "don't"
 y = f"Those who know {binary} and those who {do_not}."

 print(x)
 print(y)
 print(f"I said: {x} .")
 #还是格式化输出字符串，在输出的字符串外面带上''
 print(f"I also said: '{y}'.")

 hilarious = "False"
 joke_evaluation = "Isn't that joke so funny ?!{}"

 #输出Isn't that joke so funny ?!False
 #.format()括号里面的内容都是格式化输出
 print(joke_evaluation.format(hilarious))

 w = "This is the left side of ..."
 e = "a string with a right side."
 print(w + e)

ex7.py

 print("Mary had a little lamb.")

 print("Its fleece was white as {}.".format('snow'))
 print("and everywhere that Mary went.")
 print("." * 10)

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

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

ex8.py

 formatter = "{} {} {} {}"

 print(formatter.format(1,2,3,4))
 print(formatter.format('one','two','three','four'))
 print(formatter.format(True,False,False,True))
 print(formatter.format(formatter,formatter,formatter,formatter))

 print(formatter.format(
       "Try your",
       "Own text here",
       "Maybe a poem",
       "Or a song about fear"))

 #这个习题使用了format函数，让它返回formatter变量到其他字符串中
 #当看到formatter.format（....）,相当于
 #1.取第一行定义的formatter字符串
 #2.调用它的format函数
 #3.给format传递四个参数，这些参数和formatter中的{}匹配
 #4.在formatter上调用format的结果是一个新字符串，其中的{}被四个变量所替换

ex9.py

 # Here's some new strange stuf(材料，原料),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 tpye as much as we like.
 even 4 lines if we want,or 5, or 6.''')

ex10.py

 #\\转义字符\
 #\t转义字符tab键缩进，水平制表符，一个制表符8个位置
 #\'输出'
 #\"输出“

 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)