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, the first 17 bits are all numbers, the last digit or x, we try to use the regular to represent:Requirements on two constraintsIt's not good to write.Match at least 15 timesThis is a more professional way of writing.Escape character \ Now to match \ n, slash needs to be escaped2 underscores are escapedGreedy match greedy match: matches the string as long as possible when matching matches, by default, greedy matchThe result is aBecause it's going to be hard to go back, so it's as much as possibl

#map (a method (typically a lambda expression, or a custom method) that iterates over an object (which can be traversed with a for loop).#处理序列中的每个元素, the result is a list with the same number of elements and position as the original num=[1,2,34,223,1,3 " def C (d): return d**2def text (list,h): Tet =[] for e in list:res =return tet print (text (Num,lambda x:x**2 print (List ( Map (lambda x:x+1,num))) Print (List (map (c,num))) #filter (a method (typically a lambda expression or

: ...NUM1 = input ("Enter Number") if Num1 = = "3": num2 = input ("Please enter the number again") if num2 = = "5":p rint ("This can be guessed right!") Else:print ("Keep trying!") ")　　　　8. WhileWhile condition: PassWhile True:p rint ("Loyalty") Print ("Pink Memory") print ("Cool") print ("Wind Up")Flag = Truewhile Flag:p rint ("Loyalty") Print ("Pink Memory") print ("Cool") print ("Wind up") flag = FalseFlag = Truewhile Flag:p rint ("Loyalty") Print ("Pink Memory") print ("cool") flag = Fals

and low level, 0101010The storage of computer files, and the transfer of files. 010101010Primary Password Book:ASCII code letters, numbers, special symbols.0000 0001 8 Bit = = One byte, one byte represents one character.Character: the smallest unit that makes up the content.ABC a b CChina ChinaUniversal code: UnicodeCreate an initial 16-bit, two-byte representation of one character.a:01100001 01100001Medium: 01100011 01100001After the upgrade 32 bits, four bytes represent one character.a:011000

(Boss_jin) Teddy.bite ()　　Execution output:A_SB launched an attack.Kim's boss launched an attack.A fool bites a man in a mouthfulThen the question came, and the man launched an attack, who did he attack?Interactive Teddy hit Alex for a second.Class Person: role = ' person ' # static attribute def __init__ (self, name, sex, HP, AD): self.name = name # object Property Property self.sex = sex self.hp = hp self.ad = AD def attack (self): print ('%s laun

ageqkx funcqc__main__sayhiDeserializationImportPickledefSayhi (name):#This function must be written in deserialization, otherwise it will be an error because the function is not loaded into memory at the time of loading 　　 Print("Hello:", name) with open ("Test.json","RB") as F:data=pickle.loads (F.read ())Print(data[" Age"]) Data.get ("func")("Qianduoduo")#Execute function Sayhi#Output22Hello:qianduoduo#The logic in the output function body can also be changed, but the function name must be th

. First create a file B.txt, write the content, read the contents of the file.Since the file is related to Chinese, the code here is Utf-8With open (' B.txt ', ' R ', encoding= "Utf-8") as F: For line in F: #去除字符串左右2边的空格 line = Line.strip () # Determine if the line is empty if Len = = 0: continue #打印文件内容 Print2. Each row determines if Alex exists, and if so, replace it with the Replace () methodWith open (' B.txt ', ' R ', encoding= "Utf-8"

environment variable is not good.Print ("HelloWorld")6. Variables, constants 6.1. The definition of a variable:1. Variables can only be any combination of letters, numbers, or underscores2. The first character of a variable cannot be a number3. Keywords cannot be declared as variables [' and ', ' as ', ' break ', ' for ', ' Assert ', ' class ', ' if ', ' print ', ' pass ', ' else ', ' yield ', ' return ', ' on ', ' form ' Etc.....]6.2. How to define:1. Underline Age_of_oldboy = 586.3. Definitio

that the brackets should be changed to curly braces. Direct illustrative examplesEg: uppercase and lowercase key mergingMcase = {'a': 10,'b': 34,'A': 7,'Z': 3}mcase_frequency={k.lower (): Mcase.get (K.lower (), 0)+Mcase.get (K.upper (), 0) forKinchMcase.keys ()ifK.lower ()inch['a','b']}Printmcase_frequency#Output Results{' A ': +, ' B ':Eg: Quick change of key and valueMcase = {'a'b': in Mcase.items ()}print mcase_frequency# Output Results {ten: ' A ', ' C ': ' B '}Set Deduction formulais simi

) func (*[1,2,2]) # *[] Break a list of tuples into three parameters # func (*[1,2,2, ' SS ']) # Error, after beating for four parameters, the original function only three parameter # func (*[1,2,]) # error**kwargsThe a.** will overflow the!!! Keyword REAL parameter!!! Receive all, then save as a dictionary to assign to Kwargsdef func (x,y,z,**Kwargs): Print(x, y, z)print(Kwargs) Func (x='a', y='z', z='SSS ', ss=4444,sss=888)B. Once the argument is encountered, the value of

name of the referenced module.second, the package1. Package1) definitionA package is a way to organize the Python module namespace by using the '. Module name ', specifically a folder containing __init__.py files, created to be organized with folders/modulesAttention:A. In python3.x, the import package does not fail even if there is no __init__.py file under the package, and in python2.x, the file must exist under the packageB. The purpose of creating a package is not to run, but to be imported

;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

):Print('human beings all need work ... ') obj= Person ("Alex","Mans")Print(obj.__dict__)#Check Object Space PropertiesObj.name ="Taibai" #change of Object space propertyObj.hobby ="Play" #increment of object space PropertiesdelObj.sex#Delete the sex attribute of the object spacePrint(Obj.animal)#Object Space View properties in class spaceObj.work ()#methods for manipulating class spaces with objectsclass namespaces and Object namespaces1. Why object space can invoke properties and method

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

= [1,3,4,5] print([i for i in list1]) >>> [1,3,4,5]返回值：list#只是把原来的列表遍历了一遍，生成了和原列表一样的列表 稍作修改的列表推导式格式：[‘*‘+variable+‘*‘ for variable in list]例如：list1 = [‘a‘,‘b‘,‘c‘] print([‘*‘+i+‘*‘ for i in list1]) >>> [‘*a*‘, ‘*b*‘, ‘*c*‘]返回值：list#对variable进行修改，可以是int的操作，也可以是str的操作，具体需根据列表元素来执行 带有判断条件的列表推导式格式：[variable for variable in list if 条件表达式]例如：list1 = [2,3,4,2,1,2,23,54,21,33] print([i for i in list1 if i>20]) >>> [23, 54, 21, 33]返回值：list 多个列表推导式格式：[variable1+variable2 for varia

=[name+ ' DSB ' for name in Names]Iv. Dictionary-generatedPurpose: Used to combine two lists into a dictionary, where a list becomes a key value and one becomes valuekeys=[' name ', ' sex ', ' age 'values=[' Egon ', ' Male ', ' 18 ']dic={}For i,k in Enumerate (keys):Dic[k]=values[i] #dic ={k:values for i,k in Enumerate (keys)}Five, anonymous functionDefinition: Just a function without a namePurpose: Used for a single use of the scene, no re-use of the necessaryThe essence: Without a name, it do

, 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