full stack development tutorial

;sencond ') yield 2 print (' ===== >third ') yield 3obj=chicken () print (obj) #Second, the generator is an iteratorThe generator is essentially an iterator, which means that the generator's gameplay is actually an iterator.Obj.__iter__obj.__next__#2, so the generator is an iterator, so you can take this value res=next (obj) print (res)Mimic range () functiondef my_range (start,stop,step=1): While start For item in My_Range (1,10,2): print (item)# Result: 1,3,5,7,9Iii. conclusion

entire event (follow the top-to-bottom row-by-line execution).Local scope:Can be used inside a function.Scope namespaces:1. Global scope: global namespace + built-in namespaces2. Local scope: local namespacesFunctions: Globals () and locals ()Globals (): variable and function information used to view global scopeslocals (): used to view the contents of a local scope (which layer it depends on, which layer of variables and function information)3. Nesting of functions1. Just meet () is a function

characters　　　　test='Alex'v=test.strip ('A')Print (v)Output: Lex1.5 Upper ()Convert lowercase letters to uppercase　　test='Alex'v=test.upper ()print(v)Output: ALEX1.6 Lower ()Convert uppercase letters to lowercase　　test='ALEX'v=test.lower ()print(v)Output: Alex2. Special usage2.1 Gets a value from a string according to the index　　test='Alex'v=test[0]print(v)-------- A2.2 Gets a value of a string based on the range　　test='Alex'v=test[0:3]print(v)------Ale The value that you want to get is determi

functionCross-platform or platform-adaptive IO multiplexing:ImportSelectorsImportSocketsel=selectors. Defaultselector ()defAccept (obj,mask):"""callback function that is invoked when the selectors instance senses that a user is connected to the server. :p Aram obj::p Aram Mask:: return:"""conn,addr=obj.accept () sel.register (conn, selectors. Event_read, READ)#registering the user connection conn to the selector listener listdefRead (conn,mask):"""callback function that is invoked when the sele

RecursiveContinue running functions within the function, knowing that a goal is reached and the final return value.Characteristics of recursion:1. The function must have a definite end condition2. Without entering a recursion, the problem that needs to be addressed should be reduced3. Recursive efficiency is low, need to prevent memory overflowClass Exercises　1. Ask the way　　#Ask the way, there are several people on the road, ask if one of them knows where the place is.s1=['Alex','Xuzheng','Xiao

, Name, age):self.name = nameself.age = Agedef func (self):print (' in Func ')content=input ("if Hasattr (a,content): # equivalent if hasattr (A, "string")Print (GetAttr (a,content)) Print (GetAttr (A, "func")) # Print (GetAttr (A, "func") (one)) # in Func none (default returns None)Print (GetAttr (A, "job")) # Student Print (GetAttr (A, "Job1", "false")) # FalsePrint (GetAttr (A, "Job1")) # Error type object ' A ' has no attribute ' job1 '(3). Examples of other modulesImport Old_boyobject=getat

Split ()　　　　A=re.split ('ab','abc')Print (a)--[' ', ' C ']First split the AB, corresponding to match ab left nothing, so get the empty string, and ' C ', then AB again with C to match, no match on, output C2.11 Sub () Replace　　　　A=re.sub ('\d','abc','fhsdk3fhsdk' )print(a)--fhsdkabcfhsdkA total of three parameters, the first is the way to match, the second is after the replacement of it, the third is to find the object, and then replace2.12compile () compilationMake the rules first, then you c

Exercises:Import RequestsImport reImport JSONdef getpage (URL):response=requests.get (URL)return Response.textdef parsepage (s): com=re.compile (' '. *?Ret=com.finditer (s)For i in RET:Yield {"id": I.group ("id"),"title": I.group ("title"),"Rating_num": I.group ("Rating_num"),"Comment_num": I.group ("Comment_num"), }def main (num):url= ' https://movie.douban.com/top250?start=%sfilter= '%numresponse_html=getpage (URL)ret=parsepage (response_html)print (ret)F=open ("Move_info7", "a", en

]\D{16}[0-9X]|^[1-9]\D{14}(vi) the signifier \1. In regular expressions, there are a lot of special meanings are metacharacters, such as \d and \s, etc.If you want to match the normal "\d" instead of "number", you need to escape the "\" to become ' \ \ '2. So if the match "\d", the string to write ' \\d ', then the regular will be written in "\\\\d", so it is too troublesome.At this point we use the concept of R ' \d ', where the regular is R ' \\d ' ("R" means to cancel all escapes)(vii) Greedy

guaranteed unique immutable, can hold multiple values, can be modified, can not be unique, no, can be quickly found. The reason for a quick look is to hash the key into a string of numbers, indexed by the dichotomy, and so on.View: dic[' key ', this type of view if it does not exist, will be an error. Dic.get (' key '), this way to see if it does not exist will show none.Add/Modify: dic[' key ' = ' value 'Determine if it exists: ' Key ' in dicNesting of dictionaries:See all Value/key:info.value

Time.time () timestampShow timestamps, that's how many seconds from 1970 to now.4.1.2 Time.localtime () structured time　　　　Import Time Print (Time.localtime ())--time.struct_time (tm_year=2018, tm_mon=6, tm_mday=25, tm_hour=22, Tm_min=9, TM _sec=30, Tm_wday=0, tm_yday=176, tm_isdst=0)4.1.3 String Time4.2 Conversion between different time structures4.2.1 Timestamp conversion to structure time　　　　A=Time.localtime (Time.time ())print(a)------time.struct_time (tm_year= 2018, Tm_mon=6, tm_mday=25,

#上课的时候咩有听太懂, Blur and learn one sideOriginal fileGlobalLog127.0.0.1local2 Daemon Maxconn256Log127.0.0.1local2 infodefaults LogGlobalmode HTTP Timeout connect 5000ms timeout client 50000ms timeout server 50000ms opt Ion Dontlognulllisten Stats:8888stats enable stats URI/Admin Stats Auth admin:1234frontend oldboy.org Bind0.0.0.0:80option httplog option httpclose option forwardfor logGlobalACL www hdr_reg (host)-i www.oldboy.org use_backend www.oldboy.orgifwwwbackend www.oldboy1.org Server101.1000.

\TD Ii. Summary of today's content 1 CSS IntroductionHTML: Structural standardsCSS: Style standard cascading style sheet cascading style sheetRole: Define the effect of a Web pageJS: Behavioral Standards　　　　2 CSS three ways to introduce1). Inline styleCons: Poor maintenance2) inner-connection styleStyle type= "Text/css" >div{Color:yellow;}p{Color:black;}3) External styleLINK TypeImport type3 Base selector for CSS * * * 1) Tag Selector1. Check the label 2. No matter how deep the label is hidden,

;Body>HTML>To create a new object in IE, use the following code:var request = new ActiveXObject ("msxml2.xmlhttp.3.0");Other browsers create new objects based on XMLHttpRequest:var request = new XMLHttpRequest ();Even more troubling is that the XMLHTTP objects used in different versions of IE are not exactly the same. In order to be compatible with all browsers,the Gethttpobject function in the Gethttpobject.js file is written like this:function Gethttpobject () { if (typeof XMLHttpRequest =

the browser is the reference point.(2). If you describe it with bottom, it is the reference point in the lower left corner of the browser3. Function:(1). Return to the top bar(2). Fixed navigation bar(3). Small adsExample:Four. Z-indexCharacteristics:The 1.z-index value indicates who is pressing, the numerical value of the large gland is small2. Only the positioned elements can be z-index, that is, regardless of the relative positioning, absolute positioning, fixed positioning, are able to use

23. Tax department collects income tax. The provisions are as follows:(1) The income is below 2000. Exempt from.(2) income in 2000-4000, more than 2000 parts of the levy of 3% tax.(3) income in 4000-6000, more than 4,000 parts of the levy of 4% tax.(4) income in 6000-10000, more than 6,000 parts of the levy of 8% tax.(5) More than 10000 of the income, more than the partial levy of 20% tax.Note: If a person's income is 8000, then he will pay 2000 to 4000 tax plus 4000 to 6000 tax plus 6000 to 800

17. Read the numbers: Give a dictionary that identifies the pronunciation of each number in the dictionary, including the relevant symbols, and then the user enters a number that allows the program to read the corresponding pronunciation (no voice output is required). Simple printing.Dics = { '-':'Fu', '0':'Ling', '1':'Yi', '2':'er', '3':'San', '4':'si', '5':'Wu', '6':'Liu', '7':'Qi', '8':'BA', '9':'JIU', '.':'Dian'}s="'content= Input ('Please enter the charac

12. Output Product list, user input serial number, display user selected item (upgrade question)Product List:Goods = [{"Name": "Computer", "Price": 1999},{"Name": "Mouse", "Price": 10},{"Name": "Yacht", "Price": 20},{"Name": "Beauty", "Price": 998},]Requirements:1: Page display serial number + product name + commodity price, such as:1 PC 19992 Mouse 10...2: The user enters the selected product serial number, then prints the product name and the commodity price3: If the user entered an incorrect

21. Give a list of pure numbers. Please sort the list (upgrade question).Ideas:(1) Complete the data exchange between A and B. For example, a = ten, B = 24 after exchange, A = 10, B =(2) Loop list. Determine the size relationship between A[i] and a[i+1], if a[i] is larger than a[i+1. Then swap. At the end of the cycle. The largest data in the current list is moved to the far right.(3) Think about it if you perform the above operation again. Finally, the second-largest data is moved to the right.

14. Good sound Draft contest the judges are allowed to enter when scoring. Suppose, there are 10 judges. Let the 10 judges score, request, scores must be greater than 5 points, less than 10 points.Count = 1 whileCount : Fen= Int (Input ('Please rate the first {} judges:'. Format (count)) ifFen orFen >= 10:#Note that this is the or, not the and Print('Are you stupid?') Continue Else: Print('the first {} judges scored {}'. Format (count, Fen)) Count+ = 1Python3.6