学习过程中写的代码

参考书目为本办法学python

ex1.py

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+print("Hello world!")
+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.')

ex13.py

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+from sys import argv
+script, first, second, third = argv
+
+print("The script is called:", script)
+print("Your first variable is:", first)
+print("Your second variable is:", second)
+print("Your third variable is:", third)

ex14.py

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+from sys import argv
+
+script, user_name = argv
+prompt = "-->>"
+
+print(f"Hi {user_name}, i'm the {script} script.")
+print(f"I'd like to ask you a few questions.")
+print(f"Do you like me {user_name}")
+likes = input(prompt)
+
+print(f"Where do you live {user_name}?")
+lives = input(prompt)
+
+print("What kind of computer do you have?")
+computer = input(prompt)
+
+print(f"""
+Alright, so you said {likes} about liking me.
+You live in {lives}. Not sure where that is.
+And you have a {computer} computer. Nice.
+""")

ex15.py

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+from sys import argv
+script, filename = argv
+
+txt = open( filename )
+print(f"Here's your file {filename}:")
+print(txt.read())
+
+print("Type the filename again:")
+file_again = input("> ")
+
+txt_again = open(file_again)
+
+print(txt_again.read())

ex15_sample.txt

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+This is stuff I typed into a file.
+It is really cool stuff.
+Lots and Lots of fun to have in here.

ex16.py

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+from sys import argv
+
+script, filename = argv
+
+print(f"We're going to erase {filename}.")
+print(f"If you don't want that, hit CTRL-C (^C).")
+print("If you do want that,hit RETURN.")
+
+input("?")
+
+print("Opening the file...")
+target = open(filename,"w")
+
+print("Truncating the file.	Goodbye!")
+target.truncate()
+
+print("Now I'm going to ask you for three lines.")
+
+line1 = input("line1: ")
+line2 = input("line2: ")
+line3 = input("line3: ")
+
+print("I am going to write these to the file.")
+target.write(line1)
+target.write("\n")
+target.write(line2)
+target.write("\n")
+target.write(line3)
+target.write("\n")
+
+print("And finally, we close it.")
+target.close()

ex17.py

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+from sys import argv
+from os.path import exists
+script, from_file, to_file = argv
+
+print(f"Coping from {from_file} to {to_file}")
+
+in_file = open( from_file )
+indata = in_file.read()
+
+print(f"The input file is {len(indata)} bytes long.")
+
+print(f"Does the output file exist? {exists(to_file)}")
+
+print("Ready, hit RETURN to continue,CTRL-C to abort.")
+
+input()
+
+out_file = open(to_file, 'w')
+out_file.write(indata)
+
+print("Alright, all done.")
+
+out_file.close()
+in_file.close()

ex18.py

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+#这里定义几个函数和解包
+def print_two( *args ):
+	arg1, arg2 = args		#解包操作
+	print( f"arg1: {arg1}, arg2: {arg2}")
+
+def print_two_again(arg1, arg2):
+	print(f"arg1: {arg1}, arg2: {arg2}")
+
+def print_one(arg1):
+	print(f"arg1: {arg1}")
+
+def print_none():
+	print("I got nothin'.")
+
+print_two("Kuze","Du")
+print_two_again("Kuze","Du")
+print_one("First")
+print_none()

ex2.py

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+#这是一个注释
+print("I could code like this.")#这也是一个注释
+#我可以用注释来使得语句无效
+#print("This won't run.")
+print("This will run.")

ex20.py

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+from sys import argv
+script, input_file = argv
+
+def print_all(f):
+	print( f.read())
+
+def rewind(f):
+	f.seek(0)
+
+def print_a_line(line_count, f):
+	print( line_count, f.readline())
+
+current_file = open( input_file )
+
+print("让我们先来全部打印一下。")
+
+print_all(current_file)
+
+print("像磁带那样回溯到一个位置。")
+
+rewind(current_file)
+
+print("打印3行")
+
+current_line = 1
+print_a_line(current_line,current_file)
+
+current_line += 1
+print_a_line(current_line,current_file)
+
+current_line += 1
+print_a_line(current_line,current_file)
+

ex3.py

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+print("I will now count my chickens:")
+
+print("Hens",25+30/6)
+print("Roosters",100 - 25 * 3 % 4)
+
+print("Now I will count the aggs:")
+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("Is is greater?",5 > -2)
+print("Is is greater or equal?", 5 >= -2)
+print("Is it less or equal?", 5 <= -2)

ex3_study_drills_4.py

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+print("现在我要用浮点数来数鸡有多少只。")
+print("母鸡有：",25 + 30 / 6 )
+print("公鸡有：",100 - 25 * 3 % 4 + 0.0)
+
+print("现在我要数数蛋有多少。")
+print(3 + 2 + 1 - 5 + 4 % 2 -1 / 4 + 6)
+
+print("3 + 2 < 5 - 7 对吗？")
+print(3 + 2 < 5 - 7)
+print("3 + 2 等于多少？",3 + 2)
+print("5 - 7 等于多少？",5 - 7)
+print("怪不得结果是False。")
+
+print("大于成立？",5 > -2)
+print("大于等于成立吗？",5 >= -2)
+print("小于等于成立吗？",5 <= -2)
+

ex4.py

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+cars = 100#一共100辆车
+space_in_a_car = 4#车上的空位
+drivers = 30#司机的数量
+passengers = 90#乘客的数量
+cars_not_driven = cars - drivers #空车的数量
+cars_driven = drivers#有司机的车的数量
+carpool_capacity = cars_driven * space_in_a_car#车的总容量
+average_passengers_per_car = passengers / cars_driven#平均每辆车的乘客数，似乎/这种除法的结果怎么都是浮点数
+
+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.")

ex4_study_drills.py

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+print(round(1.7333))#没有第二个参数是返回整数
+#若第二个ndigits参数是0是返回浮点数！！！！

ex5.py

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+name = 'Kuze'
+age = 20
+height = 183*0.3937
+weight = 61*2.2
+eyes = 'Black'
+teeth = 'White'
+hair = 'Black'
+
+print(f"Let's talk about {name}.")
+print(f"He's {height} cm.")
+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")
+
+total = age + height + weight
+print(f"If I add {age}, {height}, and {weight} I get {total}")

ex6.py

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+types_of_people = 10
+x = f"There are {types_of_people} types_of_people." #把types_of_people替换进字符串
+binary = "binary"
+do_not = "don't"
+y = f"Those who know {binary} and those who {do_not}."#把binary和do_not变量替换进去
+
+print(x)
+print(y)
+
+print(f"I said: {x}")				#把x变量替换进字符串然后输出
+print(f"I also said: '{y}'")		#把y变量替换进字符串然后输出
+
+hilarious = False
+joke_evaluation = "Isn't that joke so funny?!{}"
+
+print(joke_evaluation.format(hilarious))  #用format函数把hilarious替换到字符串的{}中
+
+w = "This is the left side of..."
+e = "a string with a right side."
+
+print( w + e )

ex7.py

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+print("Mary had a little lamb.")
+print("Its fleece was white as {}.".format('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"
+
+print(end1 + end2 + end3 + end4 + end5 + end6, end=" ")
+print(end7 + end8 + end9 + end10 + end11 + end12)

ex8.py

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+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"
+	))

ex9.py

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+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 somthing 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.""")

new_file.txt

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+laozi\nchihuoguo
+ni\tok  dj
+devil may cry

test.txt

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+laozi\nchihuoguo
+ni\tok  dj
+devil may cry