learn python hard way

With the rapid development and progress of Internet technology in China and abroad, Python has been used in the fields of automated operation and maintenance, automated testing, financial quantification strategy analysis, data analysis, crawler development, web site development, scientific computing, and the gap of Python programmers on the market. It also prompted many people to start learning

are using the functions defined in module ex25 . Try to do help (ex25) and help (ex25.break_words) . This is how you get the module help documentation. The so-called help document is what you put in the "" "when you define a function, and they are also known as documentation comments (document annotations), and you'll see something more like that later. Type ex25 repeatedly. It's a very annoying thing. A shortcut is to import the module using the from ex25 import * method. It's equiv

of the error message into the search engine, and you can see that others have encountered such errors, and you may be able to find how to solve the problem.WarningIf you are from another country and you see an error about ASCII encoding, add this line at the top of your Python script:　# -- Coding:utf-8- -This allows you to use Unicode UTF-8 encoding in your script, and these errors will not occur.Bonus points ExerciseYou will also have a bonus point

? True or False True True or True True False or True True False or False False and true? True and false False True and true true False and True Td>false false and False false not OR true?

"Save as ..." option, and then select this directory.12. Use the keyboard to switch back to the Terminal window, if you do not know how to use the keyboard switch, you can search the Internet.13. Go back to Terminal and see if you can use the command to see your newly created file, Internet search How to list the contents of the folder.Warning Sometimes you'll miss out on this step:Windows has Python but no path is configured correctly. Confirm that

fo = open ("./tmp/foo.txt","w+") Fo.write ("Python is a gerat language.\nyeah its great!! \ni am Zhang Yapeng, who is you?\n ") t_str = u' I am Zhang Yanpeng, what are you? ' Print (T_STR) Fo.write (T_STR) Fo.close () #read and Write FR = Open ("./tmp/foo1.txt","r+") FW = Open ("Foo_rw.txt","WB") Done = 0; LocalTime = Time.asctime (Time.localtime (Time.time ())) Print "Local Current time:", LocalTime Fw.

of the "Python is the glue language, using Python to quickly generate a prototype of the program (and sometimes even the final interface of the program), and then to the special requirements of the part, with a more appropriateof the language Rewriting, than such as the Graphics rendering module in 3D games, performance requirements are particularly high, can be rewritten in C + +. "(3) share a very basic

. - - """% (like, age)The results are as follows: (performed under PowerShell)Ps:1. Pydoc in Windows usage, must go into the Python installation directory, execute python-m pydoc raw_input; (Of course you can replace the raw_input with other modules, such as Open, OS,)Here is the exercise code for Exercise 14:1 fromSysImportargv2 3Script, user_name =argv4prompt ='>'5 6 Print "Hi%s, I ' m the%s script."%(u

;>Next we have to do an exercise, you must be very careful, I ask you to write down this exercise, and then try to understand what it does. This exercise is very interesting, you may have the feeling of being enlightened when you finish it.1Cities = {'CA':'San Francisco','MI':'Detroit',2 'FL':'Jacksonville'}3 4cities['NY'] ='New York'5cities['OR'] ='Portland'6 7 def find_city (Themap, State):8 ifState in Themap:9 return Themap[state]Ten Else: OneReturn"Not found." A

notation reserved 2 decimal places>> 1.29e+00Formatting operator Auxiliary directivesSymbolic effect* Define width or decimal point accuracy-Used for left alignment+ Show plus sign (+) in front of positive number# 0 (' 0 ') is displayed in front of the octal number, preceded by ' 0x ' or ' 0X ' in hexadecimal (depending onUsing ' x ' or ' x ')0 The number shown is preceded by ' 0 ' instead of the default space% ' percent ' output a single '% '(VAR) mapping variable (dictionary parameter)M.N m i

Exercise 37: Reviewing various symbolsIt's time to review your learned symbols and Python keywords, and you'll learn something new in this section. What I'm doing here is a list of all the Python symbols and keywords that are worth mastering.In this lesson, you need to review every keyword, remember its role and write it down, and then search the Web for its true

mistaken. You need a way to tell that the double quotes inside the Python string are not true double quotes.To solve this problem, you need to escape the double and single quotes, and let Python enclose the quotation marks in the string. Here's an example:The second method is to use "three quotation marks (triple-quotes)", or "" ", you can put any number of line

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

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

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