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In the last two days, various types of events were not smooth, and the goods were chased by a pneumatic brake. Therefore, this series is rarely released. This article is the fourth article in the series, this article describes how to use Python to calculate Python operators. (Currently, we only know the basic usage of these operators, so that we can expand the following content. Advanced applications are n
Name= "one"‘‘‘Bin ()Oct ()Hex ()Bytes ()ASCII ()Any ()All ()ABS ()BOOL ()STR ()Dict ()List ()Callable () Determines whether it can be called, most of which are used for functionsChar () converts the number of ASCII codes to charactersOrd () Converts the character to the corresponding ASCII number‘‘‘‘‘‘Hello everyone, I am chi lei, and then I will give you a walkthrough of using Python to generate verification code functionsThe function to Use:CHR () g
"" White Time: January 8, 2018 function : generates a random 4-bit verification code (must consist of two 2 letters and 2 digits) "" "Importrandomdefmain (): list_num =[1,2,3,4,5,6,7,8,9,0]list_str=[' A ', ' B ', ' C ', ' d ', ' e ', ' f ', ' G ', ' H ', ' I ', ' j ', ' K ', ' l ', ' m ', ' n ', ' o ', ' P ', ' Q ', ' s ', ' t ', ' x ', ' y ', ' z ']veri_str= Random.sample (list_str,2) veri_num=random.sample (list_num,2) veri_out=random.sample (v
1 __author__="WSX"2 ImportNumPy as NP3 fromOpengl.glutImport*4 fromOpengl.glImport*5 ImportcTYPES6 ImportMath7 Globalgscalelocation8Scale = 0.09 #Vertex shader SectionTenVertex_shader =""" One #version A - Layout (location = 0) in vec3 Position; - the uniform float Gscale; - void Main () - { - gl_position = VEC4 (Gscale * position.x, Gscale * position.y, POSITION.Z, 1.0); + } - """ + #Fragment Sh
default parameter in the original function [], which is essentially a list variable , will change with each use. This represents an empty list constant , which should be "L=none"If the number of inputs to the function is indeterminate, the variable parameter *args is used, and if the passed parameter is a dict type, the keyword argument should be used **kwThe former is to encapsulate multiple parameters into a tuple, which is encapsulated into a dict. So the former has to pass in a single quan
/mvc/blog/sidecolumn.aspx?blogApp=yoyoketang")6 #get the entire HTML interface after requesting the homepage7Blog =r.content8 #parsing HTML with Html.parser9Soup = beautifulsoup (blog,"Html.parser")TenTag_soup = Soup.find (class_="Catlisttag") One A #print body.prettify () - -Ul_soup = Tag_soup.find_all ("a") the PrintUl_soup - forIinchUl_soup: - PrintI.stringInterested in Python interface automation, you can add
1 #!/usr/bin/env Pyhton2 #-*-coding:utf-8-*-3 #all numbers of 1-2+3-4+5...99 and (self-written)4 """5 give X a value of 0, assign Y to 0,while true, loop to start6 if the remainder of X and 2 equals 0, then X is an even number, and y assigns equal to Y minus x .7 Otherwise,
sort returns a new list that does not affect the existing list**An iterative object >>>a = [5,7,6,3,4,1,2]>>>b = sorted (a) retains the original list [1,2,3,4,5,6,7]--------------------------------- ----------------------------------------------------------cmp comparison function >>>l = [(' A ', 1), (' B ', 2), (' C ', 3), (' d ', 4 )]>>>sorted (L,cmp=lambda x,y:cmp (x[1],y[1])) [(' A ', 1), (' B ', 2), (' C ', 3), (' d ',
Python File Processing pointer (4 ), The content of the response. The first object is returned, and the second object is returned ''. It cannot be read repeatedly. What if I want to read it again? How to solve the problem. In fact, this is related to the file pointer. When we operate on the file, there will be a file pointer inside the file to locate the current location, When open is enabled, the file po
Euler's plan (python) problem 4Largest palindrome productProblem 4 A palindromic number reads the same both ways. The largest palindrome made from the product of two 2-digit numbers is 9009 = 91 × 99. Find the largest palindrome made from the product of two 3-digit numbers. Python code: Import mathSqrt = math. sqrtDef func1 (x ):S = str (x)N = int (len (s
is the meaning of monitoring, here can be seen as a database of optimistic lock concept, who can read, who can modify, but the modification of the person must ensure that their watch data has not been modified by others, or the modification failed;if __name__=="__main__": With Sms_redis.pipeline () as Pipe: while1: Try: #focus on a keyPipe.watch ('Stock_count ')count = int (pipe.get ('Stock_count')) ifCount > 0
([parameter list])//CallParameters of the functionFormal parameters and actual parameters-When defining a function, the name of the variable in parentheses after the function name is called a "formal parameter," or "formal argument"-When calling a function, the name of the variable in parentheses after the function name is called "actual parameter", or "argument"Default parameter (default parameter)def fun (x, y=100):Print x, yFun ($)Fun (1)Variables of the functionLocal variables and global va
This article mainly introduces how to use Python to get started with pygame for aircraft war games (4): Get the mouse position and movement. If you need a friend, refer to the next target for copying the airplane war, of course, after the copy, you will be able to add different content on your own. First, you need to get some image materials. People who are familiar with image processing software and paint
', ' SQLite ')def install (func1=false,func2=true,func3=true):PassParameter group: * * Dictionary * listdef test (X,*args):Print (x)Print (args)Test (1,2,3,4,5) output args= (2,3,4,5) as a ganso way to handleTest (1,{' name ': ' Alex '})Test (1,[' x ', ' y ', ' z ')) the entire list becomes a whole into the argsTest (1,*[' x ', ' y ', ' z ')) the meta-ancestor mode of processingTest (1,* (' x ', ' y ', ' z '))def test (X,**kwargs):Print (x)Print (Kwargs)Test (1,y=2,z=3)Test (1,1,2,2,2,2,2,y=2,z
Chapter 4-list object List object definition:Typedef struct {Pyobject_var_headPyobject ** ob_item;Py_ssize_t allocated;} Pylistobject;The list object is a variable-length object, so there is a variable-length object header.The ob_item array is a real storage container used to store pyobject object pointers.Ob_size indicates the list length.Allocated indicates the number of buckets allocated to the list. Create a list in two steps. 1. Create the list o
Print(All ([1,2,3,4]))#determine if the values in an iterative object are true Print(Any ([0,1,2,3,4]))#determines whether the value inside an object that can be iterated has a true Print(Bin (10))#Decimal Turn binary Print(BOOL ('s'))#convert an object to a Boolean type Print(ByteArray ('ABCDE', encoding='Utf-8'))#Turn the string into a modifiable bytes Print(Callable ('AA'))#determines whether an incoming object can be called Print(Chr (10))#print the
immediate return, and if it is not 0, the lock waits unconditionally.If the floating-point parameter timeout is set and is greater than 0, it specifies the maximum number of seconds to wait. A negative timeout indicates a permanent wait. If Waitflag is 0, you cannot specify timeout.Returns true if the lock gets successful, otherwise returns false.Starting with v
Regular expressionsUsage:>>>import re>>>s=r ' abc '>>>re.findall (S, ' abcabc ')Regular Syntax:meta-characters:. ^ $ * +? {} [] \ | ()[] used to select Match [ABC] match A or B or C[^] used to reverse the selection, such as [^ABC] does not contain ABC^ used to match the beginning of the R ' ^abc ' match ' ABCD ' instead of ' dabc '$ for matching line endings similar to ^\: Used for escaping.\d = number [0-9]\d means the inverse of D [^
ListList common actions1. Index valueName_list = [' Wang ', ' Zhou ', ' Li ', ' Hu ', ' Wu ', ' Zhao ']print (name_list[0]) print (name_list[-1])2. List slices#将列表中第一个到第二元素切片出来, form a sub-list name_list = [' Wang ', ' Zhou ', ' Li ', ' Hu ', ' Wu ', ' Zhao ']print (Name_list[1:3])3, get the length of the listName_list = [' Wang ', ' Zhou ', ' Li ', ' Hu ', ' Wu ', ' Zhao '] #h获取长度print (len (name_list)) #输出所有的元素print (Name_list[
the stack to overflow.def Calc (n): Print (n) if int (N/2) = = 0 :return n print('---- ') return calc (int (n/2)) Calc (10)Anonymous FunctionsAn anonymous function is one that does not require an explicit function to be specifieddef Calc (n): return nprint(calc)# anonymous function lambda n:n* N Print (Calc (10))Higher order functionsA variable can point to a function, which can receive a variable, and a function can recei
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