Python multi-threaded usage scenario: IO operation, not suitable for CPU-intensive Operation task 1, multiple thread memory sharing 2, thread simultaneous modification of the same data need to lock, mutex mutex 3, recursive lock: Many locks, locks have lock 4, Python multi-threading, at the same time only the CPU is executing. To start a thread:1 ImportThreading2 defrun (name)3 Print("run thread ....")4
The Hashlib module is a package that appears later in the python2.5, which mainly involves security and encryption. and Hashlib get OpenSSL "support", which supports all the algorithms provided by OpenSSL library, including MD5, SHA1, sha224, SHA256, sha512, etc. Detailed usage, which can be viewed through Pydoc hashlib, combines two simple examples to see its usage.
First, get the MD5 value of a string
For example, when the user password in the Web
.__doc__, '. ' Def HHH (): # = f + H func3 () # = f print "plus hhh" return "Hello wrold" return Hhh@deco_functio Nneeddoc@deco_functionneeddocxxx@deco_functionneeddochhhdef f (): print ' Print original FFF ' F () print "------------" Print Fprint "------------"Print f () The results are as follows:Plus yyyPrint Original FFFPlus HHHPrint Original FFFPlus HHHPlus xxxPlus yyyPrint Original FFFPlus HHHPrint Original FFFPlus HHH------------------------Plus yyyPrint Original FFFPlus HHHPrint Original
Reference URL:Various adorners in Python detailed _python_ script houseHttp://www.jb51.net/article/63892.htmOne, function-type decorator:1, the adorner has no parameters, is decorated object without parameters1 defTest (func):2 def_test ():3 Print('Call the function {0}.'. Format (func.__name__))4 returnfunc ()5 return_test6 7 @test8 defsay ():9 Print('Hello,world')Ten One Say () A - Output: - Call the function say. theHe
This article is mainly to share with you the Python iteration model examples, mainly in the form of code and we share, hope to help everyone.
#-*-Coding:utf-8-*-"" "Created on Thu Mar 11:43:05 2018@author:mz" "" Class Iterator (object): Def Next (self): Pass Def Hasnext (self): Pass def first: Pass Def Forward (self): Passclass cocre Teiterator (Iterator): Def __init__ (self, aggregate): Self._aggregate =
The examples in this article describe Python's simple function definition and usage. Share to everyone for your reference. The specific analysis is as follows:
A function of temperature conversion and its usage are defined here.
def converttemp (temp, scale): if scale = = "C": return (temp-32.0) * (5.0/9.0) elif scale = = "F": return Temp * 9.0/5.0 + 32temp = Int (Input ("Enter a temperature:")) scale = input ("Enter the scale to convert to:"
The sample code for sending the message is as follows: fromWebutilsImportProperitiesload fromEmail.mime.textImportMimetext fromEmail.mime.multipartImportMimemultipartImportSmtplibImportOSclasssendmails ():" "to send a message with an attachment, you first create an instance of Mimemultipart (), and then construct the attachment, which, if there are multiple attachments, can be constructed in turn and then sent using SMTPLIB.SMTP. " " def __init__(self): Mail=properitiesload.lodingproperities
1L1 = List (['W','u','W','e','N'])2L1.append ('I')3L1.append (['s','s'])#Append parameters to the original type4L1.append ('SB')5L1.append (6)#You can add numbers6 Print(L1)7 8result = L1.count ('s')9 Print(Result)Ten One #extend can only add iterable when parameters: Array, string, list AL1.extend ([' the',' the'])#Expand the contents of the parameter -L1.extend (' the')#the string was taken apart. -L1.extend ('999')#can't add a number to the error the Print(L1) - -result = L1.index ('W')#Fin
Closures, interpreted in Wikipedia as: In programming languages, a closure (also lexical closure or function closure) is a function or Refe Rence to a function together with a referencing environment-a table storing a reference to each of the non-local (also called free variables or upvalues) of the that function. My understanding is that closures are entities that are combined by functions and reference environments associated with them. Non-local variables are referenced in the function of th
One, code example
#-*-Coding:utf-8-*-import requestsheader = {' user-agent ': ' mozilla/5.0 (Windows NT 6.1;Win64; x64) applewebkit/537.36 (khtml, like Gecko) chrome/53.0.2785.143 safari/537.36 '}proxy_ip = {' https ': ' https://115.28.1 48.137:8118 '}html = Requests.get ("http://www.baidu.com", Headers=header, proxies=proxy_ip) print Htmlprint Html.text
Second, by modifying the proxy IP server address of the PROXY_IP parameter, you can change the proxy IPThird, error
Tkinter is used to write GUI interfaces, Python3 is already included and used directly.1 #Gui:tkinter Use Example2 ImportTkinter3 4 #instantiating a Tkinter object5top =Tkinter. Tk ()6Top.geometry ('220x60')#Set Window Size7Top.title ('Tkinter Use Example')#Set Window caption8 9 #creates a new Label control object that displays "Hello World"Tenlabel = Tkinter. Label (Top, text='Hello World') One #load a Label control A Label.pack () - - #New Button control theQUIT_BTN = Tkinter. Button (Top, te
()) A at Print("\ n-----------------split line-----------------\ n") - - #time.ctime ([secs]) functions equivalent to Asctime (localtime (secs)), parameter is equivalent to Asctime () - Print("time.ctime ():", Time.ctime ()) - - Print("\ n-----------------split line-----------------\ n") in - #time.gmtime ([secs]) accepts a timestamp (the number of floating-point seconds elapsed in the 1970 ERA), returning the time tuple under Greenwich Astronomical TIME to Print("time.gmtime ([secs])", Tim
response to this situation, We can do this by adding one more clause t.join () before Queue.join ().If we get rid of the Queue.task_done () function in the customer function, we can run theITEM0 ProduceProcess Item0 finishedITEM1 ProduceProcess Item1 finishedITEM2 ProduceProcess Item2 finishedITEM3 ProduceProcess Item3 finishedITEM4 ProduceProcess Item4 finishedNote that the program never ends, and the last line end statement does not appear. Because at join there, although the queue is already
to: https://github.com/Grokzen/redis-py-cluster/tree/master/testsImport redisfrom rediscluster import rediscluster def main (): Startup_nodes = [{"Host": "127.0.0.1", "Port": "7000"}] r c = Rediscluster (Startup_nodes=startup_nodes, decode_responses=true) print '--------get/set---------' if not rc.set ("foo", "Hello, Redis-py-cluster"): print ' Set foo to cluster failed!!! ' return-1 print ' foo =%s '% (Rc.get ("foo"),) if __name__ = = ' __main__ ': Main ()This article is from the "Quiet lunati
)String tuples: Tuple (String)In []: sOUT[24]: [' A ', ' a ', ' a ']in [+]: tuple (s)OUT[26]: (' A ', ' a ', ' a ')Tuple to string: '. Join (tuple)In [SI]: type (a)OUT[54]: Tuplein [+]: a = str (a)in [+]: AOUT[56]: "(' A ', ' B ', ' C ', 111)"In [the]: type (a)OUT[57]: StrDictionary goto list:in [+]: dic = {' A ': 1, ' B ': 2}in [+]: dicOUT[29]: {' A ': 1, ' B ': 2}in [+]: Dic.items ()OUT[30]: [(' A ', 1), (' B ', 2)]List to Dictionary:In [to]: L1 = Dic.items ()in [+]: L1OUT[32]: [(' A ', 1), ('
)Popen2. Popen3 and Popen2. Popen4 basically work as subprocess. Popen, except that:Popen raises an exception if the execution fails.The Capturestderr argument is replaced with the stderr argument.Stdin=pipe and Stdout=pipe must be specified.Popen2 closes all file descriptors by default, and you have to specify Close_fds=true with Popen.1.5. NOTES1.5.1. Converting an argument sequence-a string on WindowsOn Windows, an args sequence are converted to a string that can be parsed using the following
The examples in this paper describe the usage of bisect modules in Python and share them for your reference.
The specific methods are analyzed as follows:
This module has only a few functions, once the decision to use a binary search, immediately think of using this module.
The sample code is as follows:
Import Bisectl = [1,3,3,6,8,12,15]x = 3x_insert_point = Bisect.bisect_left (l,x) #在L中查找x, X is pr
Threading. Thread
Thread is one of the most important classes in the threading module and can be used to create threads. There are two ways to create a thread: One is to override its run method by inheriting the thread class, and the other is to create a threading. The thread object in which the callable object is passed in as a parameter in its initialization function (__INIT__). The following examples are illustrated separately. Let's take a look a
The examples in this paper describe the usage of bisect modules in Python and share them for your reference.
The specific methods are analyzed as follows:
This module has only a few functions, once the decision to use a binary search, immediately think of using this module.
The sample code is as follows:
Import Bisectl = [1,3,3,6,8,12,15]x = 3x_insert_point = Bisect.bisect_left (l,x) #在L中查找x, X is pres
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