python tutorial with exercises

Do you have a chicken or an egg first? From eggs can be changed to chicken, this is certainly set up, the chicken can also produce eggs, from the evolutionary perspective, eggs need to hatch to become chicken, if there is no chicken, who will hatch eggs? And inside the chicken belly, there is no egg at first, but evolutionary evolution, it may have eggs in the belly; doubt, is it possible that other species have laid eggs, eggs may be in a bad environment, the eggs inside the species produced b

This section is about the practice of PHP arrays, using a one-dimensional array averaging example, for everyone to learn the reference. Requirements: Enter 5 numbers in the input box (enter those 5 numbers separated by a space), use a one-dimensional array to write a program to find their average value (keep 2 decimal digits). Review: PHP basic tutorial PHP array exercise Code is as follows: Please enter 5 numbers and separate them with

milliseconds values, such as. Show (850). Note that unlike the speed parameter names represented by a string, the values do not need to makeUse quotation marksThe difference between show () and fadeIn two effects is that. FadeIn () Sets the dimensions of the paragraph at the beginning so that the content can be displayed gradually. Similarly, to gradually reduce the opacity, you can use the. FadeOut ()jquery provides a. Toggle () method that acts like the. Show () and. Hide () methods, and, as

When writing a Python script, you can add the following code segment at the beginning of the script: # _ * _ coding: UTF-8 _ * _ its effect and # codingutf-8 is the same below to summarize the problem of how to pass parameters when learning Python defined functions: 1, first is the location of parameters and default value: define a function func_name with the form parameter arg. a first describes how to use

1. Two ways to run Python scripts Run the. py file to Python in Windows or Linux Python's own interactive interpreter runs directly2, briefly describe the relationship between bits and bytes 1 bits is the smallest representation unit in a computer 1 bytes is a small storage unit in a computer. 8 x bits = one byte3. Brief description of the relationship between ASCII, Unicode, Utf-8, GBK ASCII

Python programming Quick Start-making tedious work automated-chapter two exercises and their answers 1, what are the two values of the Boolean data type? How do I spell it?A: True and false, use uppercase T and uppercase F, and the other letters are lowercase.What are the 2, 3 Boolean operators?Answer: And, or, and not.3. Write the truth table for each boolean operator (i.e., each possible combination of op

Exercises Vamei Source: http://www.cnblogs.com/vameihttp://www.cnblogs.com/vamei/archive/2012/07/19/2600135.html#undefined"Implement" #!/usr/bin/python#-*-coding:utf-8-*-#-------Calculate date difference ' Import datetimefrom datetime import dated1= Date (2008,1,1) d2=date (2008,10,1) t=abs (d2-d1) n=t.days+1print n#----Determine if 2008 is a leap year, Def leapyear (year): #判断year是否为闰年, ture for leap year

follows:p = 1print (' 1 peaches left before the 10th day ') for I in range (9, 0,-1): p = (p+1) * 2 print ('%s peach '% (I, p)) print (' 1th day ') '%s ' A peach '% p)The output results are as follows: There are 1 peaches left before the 10th day of eating.There are 4 peaches before the 9th day of eating.There are 10 peaches before the 8th day of eating.There are 22 peaches before the 7th day of eating.There are 46 peaches before the 6th day of eating.There are 94 peaches before

#!/usr/bin/env python#-*-Coding:utf8-*-Name = input ("Please enter your name:")Print (name)----------------------------------------------Python 2.0 Python 3.0input = = EvalRaw_input = = Input------------------------------------Input: Converts the type according to the user's inputRaw_input: The user's input is treated as a stringExample:If you enter "57 + 3":Inpu

: - Print "Invalid:first symbol must be alphabetic" + elifMyinputinchKW: A Print "invalid:it a python keyword" at Else: - forOthercharinchMyinput[1:]: - ifOtherchar not inchAlphas +Nums: - Print "invalid:remaining symbols must be alphanumeric" - Break - Else: in Print "Okay as an identifier"3. Sorting(a) Enter a series of numbers and arrange them from lar

[Switch] Python exercises, Web Crawler frameworks Scrapy and pythonscrapy I. Overview Shows the general architecture of Scrapy, including its main components and the data processing process of the system (green arrow shows ). The following describes the functions of each component and the data processing process. Ii. Components 1. Scrapy Engine (Scrapy Engine) The Scrapy engine is used to control the data

Python exercise 003: Number of complete exercises, python003 [Python exercise question 003]An integer. After 100 is added, it is a full number of workers, and 168 is a full number of workers. What is this number? ------------------------------------------------- The so-called "full number" means that the root number is still an integer. The mathematical scum is l

forScoresinchFilterLambdaS:s.score , user_scores): the PrintScores.name + #statistic the begin of name which is ' L ' - Print "users whose name ' s begin is ' L ':" the forNamesinchFilterLambdaS:s.name.startswith ('L'), user_scores):Bayi PrintNames.name the #statistic The total scores of all one the Print "The total scores of everyone:" -Allscores = Map (LambdaS:s.score, User_scores) - PrintAllscores the PrintReduceLambdaX, y:x+y, allscores, 0)

generate random verification code continue to wait for user inputExample of generating a random CAPTCHA code: while True: = Check_code () print(code) = input (">>>>> ")19, develop the sensitive Word filter program, prompts the user to enter the content, if the user enters the content contains the special character:such as "Cang Teacher" "Tokyo Hot", then replace the content with * * *v = "Erewewrew"v = v.replase (' s ', "Rewerwer")v = v.replase (' A ', "Rewerwer")Print (v)M

)Thread2 = Mythread (2,"Thread-2",2)#开启新线程Thread1.start ()Thread2.start ()Thread1.join ()Thread2.join ()#等待至线程中止.Print"Exit main thread")###################################################################C:\python3.7\python.exe d:/python-test/Multithreading/multithreading. pyStart Thread: thread-1Start Thread: thread-2thread-1:tue Nov28 10:27:57 2017thread-2:tue Nov28 10:27:58 2017thread-1:tue Nov28 10:27:58 2017thread-1:tue Nov28 10:27:59 2017thread-

%16 and! Year%25 these are not leap years, and vice versa! (year%4 or year%16 and!) YEAR%25) converts a bitwise operation for a leap year! (Year3 or year15 and!) (year%25)):p Aram T:: Return: "" "Print (" Calculate Nine ", end=": ") days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, Year = T.year if Not (year 3 or Year 15 (year)): days[1] = print (sum (days[0:t.month-1) + t.day) def answer (): "" "to determine the date entered by a try Whether it is correct: return: "" "Year = input (" Enter

offset is generally calculated relative to the beginning of the file and is generally a positive number. However, if the whence parameter is provided, whence can be calculated from scratch for 0, and 1 for the current position as its origin. 2 means that the end of the file is calculated as the origin. Note that if the file is opened in a or a + mode, the file action tag is automatically returned to the end of the file each time the write operation is made. Fp.truncate ([size]) #把文件裁成规定的大小, th

fromScore left Join2 ( 3 Select4 SID,5(Select num fromScore as s2 where s2.course_id = s1.course_id order BY num DESC limit 0,1) as First_num,6(Select num fromScore as s2 where s2.course_id = s1.course_id order BY num DESC limit) as Second_num7 from 8 score as S19 ) as TTenOn score.sid =T.sid Onewhere Score.num andScore.num >= T.second_num 36. Retrieve the student number of at least two elective courses 1 from from score GROUP by course_id) as A 2 from score left joins student on St

,_data_cnt): Rd_num = Random.randrange (0,_max_value,1) #print (rd_num) Cur.execu Te ("INSERT into Ramdon_data (value) VALUES (%s)," "% Rd_num) conn.commit ();p rint (" Data Ready ") Cur.execute (" Selec T * from Ramdon_data; ") ans = Cur.fetchall () for D in ans: #print (d) value = d[1]; Times = got_cnt (d[1]) + 1 if Times is 1:cur.execute ("INSERT into sorted(Value,times) VALUES (%s,%s); "% (Value,times)) Else:cur.execute (' UPDATE sorted SET times=%s WHERE value=%s; ' "% (Times,value)) Con

Writing the Login interface Enter User name password Show welcome message after successful authentication Three-time error after locking #!/usr/bin/env python#_*_ Coding:utf8 _*_ImportGetpassusername='Daxin'Password='123456'defPanduan (name): With open ('/tmp/result.log') as Fd:content=Fd.read ()ifLen (content) = =0:returnTrueElse: Lockname=content.split () [0] Zhuangtai= Content.split () [1] ifLockname = = Name andZhu