c machine learning library

expression) Regex=re.compile (R ' (\bt\w+) \w+ (\w+) ') print ' Inputtext : ',textprint ' pattern : ', Regex.patternmatch=regex.search (text) print ' entirematch : ', Match.group (0) #表示整个表达式的字符串, sub-group sort print ' worldstartwith "T" starting from 1: ', Match.group (1) #匹配到的第一组print ' worldafter "T" NBSP;WORDNBSP;: ', Match.group (2) # The second group matched to the #python extended the basic grouping (? PContinue to study in .....This article is from the "brotherxing" blog, make sure

Installation sudo yum install NumPy From numpy Import * Produces an array Random.rand (4,5) Result Array ([[0.79056842, 0.31659893, 0.34054779, 0.97328131, 0.32648329], [0.51585845, 0.70683055, 0.31476985, 0.07952725, 0.80907845], [0.81623517, 0.61038487, 0.66679161, 0.77412742, 0.03394483], [0.41758993, 0.54425978, 0.65350633, 0.90397197, 0.72706079]]) Produce a matrix >>> Randmat=mat (Random.rand (bis)) >>> randmat.i Matrix ([[[1.72265179, 0.82071484, 0.8218207,-3.20005387], [0.60602642,-1.28

ObjectYou can use the Pickle.dumps () method to convert an object summer to a string picklestring (that is, a text stream).We can then store the string in the file (the input and output of the text file) using the normal text storage method.Import Pickleclass Bird (object): have_feather = True way_of_reproduction = ' egg ' summer = Bird () FileName = ' Save.pkl ' with open (FileName, ' W ') as f: # Open file with write-mode picklestring = Pickle.dump (Summer, F) # serialize and save O

conforms to the Gaussian distribution, and the Mu,sigma is two parameters of the Gaussian distribution.Random.expovariate (LAMBD) # randomly generates a random number that conforms to the exponential distribution, LAMBD is the parameter of the exponential distribution.There are also logarithmic distributions, normal distribution, Pareto distributions, Weibull distributions.Suppose we have a group of people in a dance competition, in order to be fair, we have to randomly arrange their appearance

(f) # Read file and build objectThe function and use of the Cpickle package of the two Cpickle package almost exactly the same as the pickle package, where the difference is actually very seldom used;The difference is that Cpickle is based on the C language, which is 1000 times times faster than the pickle package.For the example above, it is assumed that using the Cpickle package, we can change the import statement to:Import Cpickle as PickleThere is no need to make any changes.Python

()) Save the above program as a py_id.py file, using $python py_id.py and $sudo python py_id.py to see the results of the operationSaved UID and saved GIDWhen we write a Python script, we actually run the Python interpreter instead of the Python script file.Run the execution file compiled by the C language directly in contrast to the C,c language. We have to change the permissions of the Python interpreter itself to apply the saved UID mechanism, but it is extremely dangerous.For example, our P

random valuevoid Resize (size_type n,t x); Adjusts the elements of the list to N, multiple deletions, and a value of Xint size () const; Returns the number of elements in the current listint max_size () const; Returns the maximum allowable list element number value7) Other functions　　void swap (list x); Swapping elements from two listsvoid Splice (iterator it,list x); Link the list x to the current list iterator it points to the location where the list x becomes emptyvoid Splice (iterator it,li

vector element number valuesuch as: string str[7] = {"Has fun", "has fun", "Good Luck", "Good Luck", "has Fun", "has Fun", "has Fun"};VectorA.pop_back ();CoutCoutCoutProgram output:7) Other functionsvoid swap (vector); Exchange data for two vectors of the same typevoid assign (int n,const t x); Sets the value of the nth element in a vector to Xvoid Assign (Const_iterator first,const_iterator last); Sets the element in the vector [First,last] to the current vector element8) Common algorithms　　So

Instead of directly maintaining the controlled sequence, the container adapter implements all functions through the underlying container object stored in it.The queue class allows you to insert elements at the end of the underlying data structure, and also allows you to insert elements from the front (first in, first out).Include header file #include Common Queue operations:1.void push (const t val); Inserts an element at the end of the queue (implemented by invoking the Push_back function of th

controlled sequenceIterator Erase (iterator first,iterator last); Delete all elements within the range [First,last] in the controlled sequenceSize_type Erase (const key Key); Deletes an element with an element value equal to key and returns the number of deleted elementsvoid Clear (); Emptying the controlled sequence7) Other operation functions　　void swap (set x); Swap set elementsvoid swap (multiset x); Exchanging multiset elements　　Key_compare Key_comp () const; Returns a function for compari

.start () time.sleep (1) print ' main End 'Output Result:Setdaemon default is Falsemain startthread startmain endthread end Setdaemon set to Truemain startthread Startmain end　　As can be seen from the printed result, when set to true, the thread is still in the sleep process is over, so that the thread end of the sentence is not printed out.Of course, the thread class is more than these methods, these are just common methods, through Help (thread) can be viewed."Python Standard

1 Build Project: Build project folderScrapy Startproject Project Name2 Creating a crawler fileScrapy genspider reptile name specified domain name3 Enter the items file to enter what you want to crawl, such asText = Scrapy. Field ()Author = scrapy. Field ()tags = scrapy. Field ()4scrpapy shell-specific web addressThis allows you to test the successful capture of elements in the shell5 Launching a crawler projectScrapy Crawl Reptile name (2 inside the crawler name)6 Data savingScrapy Crawl-o file

Disclaimer: This article originates from the JavaScript Learning Library prototype object of the programming helper app, which defines the properties and methods shared by all instance objects, so it is also referred to as the prototype of the instance object, which can be viewed as deriving from the prototype object. A constructor is a function and also an object, and all constructors have prototype attrib

pages of the server, and the server should know by some means that it is a client and needs a session object.3) Destruction:There are only three ways to destroy a session:1. Call the Session.invalidate () method2.session expired (timed out)3. Server restartThe Tomcat default session time-out is 30 seconds.There are two ways to set the session time-out:1.session.setmaxinactiveinterval (time);//Unit is seconds2. Configuring in Web. xml10(Note: the Web. XML document is in the Web-inf directory of