learn python hard way 4th edition

sentence in such a format: "The 1st animal is at 0 and was a bear." And then read upside down: "The animal at 0 are the 1st animal and is a bear."Use Python to check your answers.Bonus points Exercise Search the Internet for knowledge of the ordinal number (ordinal number) and cardinality (cardinal number) and read it. With your understanding of these different types of numbers, explain why "January 1, 2010" is 2010 instead of 2009? (Hin

find a problem with the map, adjust the map so that the code and the map match each other.One last suggestion: Every programmer will be influenced by irrational fears when they start a big new project. In order to avoid this fear, they will stall time and end up doing nothing. I sometimes do that, everyone has this experience, the best way to avoid this situation is to make a list of what you want to do, one time to complete the same.Start doing it.

explain the meaning of the code to yourself through annotations. Explain how each function is used, the purpose of each variable, and any other aspect of the content, as long as it helps you to understand the code.Finally, each part of the code that is difficult to track, line-by-row or function-by-bit tracking variable values. You can print one more copy and write the value of each variable you want to "track" in the blanks.Once you have a basic understanding of the function of the code, go ba

Exercise: Your first website Exercise: getting input from the browser Exercise: Create your Web game Select a project, read through its documentation and easy tutorials. During the reading process, write the code in the document yourself and let them operateYes. I learned this way, in fact, every programmer is doing so. After reading the tutorials and documentation, try writing something.Come out. Write anything, even if it is written by others can b

done."Out_file.close ()In_file.close ()#另一种写法 (only one line):From sys import ARGVScript,from_file,to_file = argvOpen (To_file, ' W '). Write (open (from_file). Read ())Exercise: naming, variables, code, functionsWhat are the rules for function names?As with the variable name, it can be as long as it consists of alphanumeric and underscore, and not the number beginning.What does it mean to be *args *?Its function is to tell Python to accept all the p

It seems that the following is the most elegant implementation.Other, either node redundancy, or initialize ugly ...#!/usr/bin/env python#-*-coding:utf-8-*-classNode:def __init__(self, initdata): Self.__data=InitData self.__next=NonedefGetData (self):returnSelf.__data defGetNext (self):returnSelf.__next defSetData (Self, newdata): Self.__data=NewDatadefSetnext (Self, newnext): Self.__next=Newnextclasssincyclinkedlist:def __init__(self): Self.head=No

The 32-33 chapters will be for-loop and while-loop loops.The two kinds of syntax will not be said. Simply say the individual's understanding for and while.I think he learn python.First say the same point:1, can not do a single operation, For-loop if the collection is empty, the condition behind the while is false he can also do a loop operation is not done, the test method is as follows:　　 for inch []: Print " 1 " , I, 　　　 While I : Print 1

line, and clarify your ideas for yourself. Even if you can't clear your mind, you can also know exactly where you really didn't understand. Write a script similar to the one in the previous exercise and read the file you just created, using Read and argv . There are too many places to repeat in the file. Try to print line1, line2, line3 with a target.write () , you can use strings, format characters, and escape characters. Find out why we need to give open multiple a ' W ' paramete

!" - Else: - Print "Well , doing%s is probably better. Bear runs away."% Bear - + elifDoor = ="2": - Print "You stare to the endless Abyss at Cthulhu ' s retina." + Print "1. Blueberries." A Print "2. Yellow jacket clothespins." at Print "3. Understanding revolvers yelling melodies." - -Insanity = Raw_input (">") - - ifInsanity = ="1" orInsanity = ="2": - Print "Your body survives powered by a mind of Jello. Good job!" in Else: - Print "The

Today read the 40th chapter of LPTHW after the enlightened, the original has been dull, do not understand the definition and use of the class, there is not quite understand the definition of self.class MyStuff (object): def __init__ "and nowa thousand years between"def Apple: print "I AM classy apples! "　　Say the class and the Mini module is similar, then for the class, there must be an import-like concept. The concept name is "instance (instance)". This is just a acting knowledgeable, it

this script with Raw_input, think of the way to get the file name better, and why.6. Run Pydoc file to scroll down until you see the read () command (function/method). See a lot of other orders, you can find a few to try. No need to look at the commands that contain __ (two underscores), these are just rubbish.7. Run Python again at the command line to open a file, this open and read method is also worth l

list6 forNumberinchThe_count:7 Print "This is count%d"% Number8 9 #Same as aboveTen forFruitinchFruits: One Print "A Fruit of type:%s"%Fruit A - #also we can go through mixed lists too - #Notice we have the use of %r since we don ' t know what's in it the forIinchChange : - Print "I got%r"%I - - #We can also build lists, first start with an empty one +elements = [] - + #Then use the range function to does 0 to 5 counts A forIinchRange (0, 6): at Print "Adding%d to the lis

,%r tall,and%r heavy. "% (age,height,weight)#exercise12 prompting othersY=raw_input ("Name?") #这句话会用 "Name" prompts the user and assigns the result of the user input to the variable Y.#这就是我们提问用户并且得到答案的方式.Age=raw_input ("How old is You?")Height=raw_input ("How Tall is You?")Weight=raw_input ("How much does you weigh?")Print "So" is%r old,%r tall,and%r heavy. "% (age,height,weight)#exercise13 parameters, unzip, variableFrom sys import ARGVScript, first, second, third = argvPrint "The script is cal

? What happens if you don't indent? Is it possible to put the other Boolean expressions in Exercise 27 in the "if statement"? Try it. What happens if I change the initial value of the variable people, Cats, and dogs ? Exercise Exercises1.The IF statement.if sentence1: sentence2The sentence one is the judgment part , of course, it can also be a Boolean expression of the previous lesson.The white space in front of the statement two is also part of the IF statement, and using i

":Return ' death 'elif action = = "Slowly Place the bomb":Return ' Escape_pod 'ElseReturn ' The_bridge 'def escape_pod (self):Good_pod = Randint (1,5)Guess = Raw_input ("[Pod #]>>>")if int (guess)! = good_pod:Return ' death 'ElseExit (0)Class Engine (MAP):def __init__ (Self,start):Self.start = Startdef play (self):Next = Self.startWhile True:print "\ n-----------"GetAttr (Self,next)Next = Guest ()A_game = Engine ("Central_corridor")A_game.play () Remark: Beginner young novice, Welcome to the gre

commas (comma). Just like you go to the store and say, "I want to buy milk, bread, eggs, eight treasures porridge," just as programmers say "(milk, eggs, bread, soup)."We will type a large number of strings, variables, and formatting characters, and print them out. We'll also practice using the shorthand variable name. Programmers like to use shorthand for annoying difficulty to save typing time, so let's learn this early so that you can read and wri

the same, for example, to deal with an int type Object%r will be more "on the side of the string."String (srring) and textW = "This is the left side of ..." E = "a string with a right side." Print W + ethis is the left side of...a string with a right Side.print "." * 10 .....Printdays= "Montuewedthufrisatsun" months= "Jan\nfeb \nmar\napr\nmay\njun\njul\naug "print" herearethedays: ",days print "herearethemonths:",monthsprint "" "There ' s Somethinggoingonhere.withthethreedouble-quotes.we ' Llbe

exercises 24 and 25 into a file, deleted some of the characters at random, and then added some bugs in. Most of the error is that Python will tell you when it executes, and there are some arithmetic errors you want to find out for yourself. All that's left is formatting and spelling mistakes.All of these errors are easily made by programmers, even if experienced programmers are no exception.Your task is to modify this file correctly and use all your

Some extensions are made according to the content of chapter 16.For example, if a file exists, it is appended to the file and created if it does not exist.It also draws on a method similar to the cat Now there is a small pit, how to use Python to read a file of the number of rows, the original Os.system ("Wc-l filename") is OK, but how to operate under Windows? Fill it back.#!/usr/bin/env python#-*-coding:u

First, learn to use terminal to create a directoryMkdir--make Directory CreationUsage: $ mkdir Example:1, $ mkdir Test001Create a "Test001" directory under the current directory2, $mkdir test001/test002Create the directory "test001/test002" under the current directory, and generate the appropriate directory if the directory "test001/test002" does not exist.3. If a file (or folder) named Test001 is present in the current directory, the $ mkdir Test001