: global s s = Socket.socket () host = Socket.gethostname () S.bind ((host, 60123)) except: print (' already have an Instance ... ') return None return func (*args,**kwargs) return fun@applicationinstancedef main (): While True: print ' running ... ' time.sleep (1) if __name__ = = "__main__": Main ()Iv. Summary(1) Daemon and single script running in the actual application of the more important
There is no concept of a class in Lua, but classes can be modeled by table, function, and some language attributes. The value of the table can be a function. Look at the following code:
Logutil = {Msg_prefix = String.Format ("%s", Os.date ("%h:%m:%s", Os.time ())}Logutil.write = function (msg)Print (Logutil.msg_prefix. Msg.) "\ r \ n")EndLogutil.write ("This is a Notice Info")
Define a log table,table has a key named Msg_prefix and a key named write
python3.x __)
• _ Dir _ (self)
• Defines the behavior that is generated when dir () is called by an instance of your class. This method should return a list of attributes to the user.
• _ Sizeof _ (self)
• Defines the behavior that sys. getsizeof () is called by an instance of your class. In bytes, this method returns the size of your object. This is usually more meaningful for
__slots__because Python is a dynamic language, any instance can dynamically add properties at run time. If you want to limit the properties that you add, for example, the student class only allows you to add the 3 properties of name, gender, and score, you can take advantage of a special __slots__ of Python. As the nam
Example of creating an xml file in Python and example of pythonxml
This example describes how to create an xml file in Python. We will share this with you for your reference. The details are as follows:
This is an example of gener
Python class and inheritance usage instance, python usage instance
This example describes the definition and usage of python classes and inheritance. Share it with you for your reference. The details are as follows:
class Employee
to return. (Change to _ bool _ in python3.x __)
_ Dir _ (self)
Defines the behavior that is generated when dir () is called by an instance of your class. This method should return an attributeListTo the user.
_ Sizeof _ (self)
Defines the behavior that is generated when sys. getsizeof () is called by an instance of your class. In bytes, this method returns the size of your object. This is usual
#! /usr/bin/pythonThe first line: The interpreter that executes the script notification content to be opened;Import PlatformThe second line: Importing a Python module platform via import;Print Platform.uname ()The third line: print the execution result of the Uname method of the Platform module;Finally give the script executable permission;2:python scripts can be divided into: modules, statements, expressio
Create a class in Python, execute the program when creating instance attributes, and create a python instanceFor example, you can understand the execution process of the program in this way: 1 -- open up a space in the memory to store the created class object, and the Tool (
them to be printed. The advantage of an ordered dictionary at this point is:3. Default dictionary (defaultdict)Defaultdict is a supplement to the type of dictionary, which defaults to a type for the value of the dictionary.The following functions are implemented in code有如下值集合 [11,22,33,44,55,66,77,88,99,90...],将所有大于66的值保存至字典的第一个key中,将小于66的值保存至第二个key的值中。即: {‘k1‘: 大于66,‘k2‘: 小于66}看出神奇的地方了么?我们可以不需要在空字典中指定value的值,直接执行append,就可以向字典中插入值了,就是因为我们使用defauldict(list)方式定义了一个value值默认为list的字典。Otherwise we're
conditions (such as using lock ). Otherwise, you are advised to go to my previous article basics of Threads.
Reference Wikipedia:
The producer's job is to generate a piece of data and put it in the buffer. At the same time, the consumer is consuming the data (such as removing them from the buffer), each piece.
The keyword here is "at the same time ". Therefore, the producer and consumer run concurrently. we need to separate the producer and consumer threads.
from threading import Thread
Example of using the _ SLOTS _ attribute in Python, and python _ slots _
Let's see an article about python memory optimization in the daema organization of the python community, using _ slots __. Then I checked it and summarized it. Very useful
When the
Python class Propertiesis a function of the language itself, this article will explain through the example of what is
Python class letters,and how to use
Python access properties.
A. The Py
control the generation of the class, which is actually the process of calling the Meta class, that is, Myteacher=mymeta (' Myteacher ', (object), {...}), and calling Mymeta first produces an empty object Myteacher, The __init__ method is then passed to Mymeta with the parameters in the call Mymeta parentheses, which completes the initialization, so we can Class
Self can be understood asSimilar to the this pointer in C + +, the object itself means that when the method is called with an object, the object is passed as the first argument to selfThere are properties, methods in the Python class, where properties can have private and public points, and methods can qualify and protect private properties, similar to the functionality of properties in C #.Method also has
The python filter string does not belong to the class instance of Characters in the specified set. The python string
This example describes how to filter strings in python that do not belong to characters in a specified set. Share it with you for your reference. The details
Example of _ call _ usage in Python and python _ call _
This article describes the usage of _ call _ in Python and shares it with you for your reference. The specific method is as follows:
Let's take a look at the following sample code:
# Call. py when a class is loaded.
Python uses the first-class function to implement the design mode, and the python Design Mode
Case study: Restructuring the "Policy" Model
Some design patterns can be simplified if the functions used as first-class objects are reasonably used, and the "Policy" pattern is a good ex
Like. net, python can dynamically generate class instances based on class names, but it is more convenient than. net. The following example uses the idle IDE environment of python2.4,
The. py file code is as follows:
Class Employee:
Def _ init _ (self, name, age, ad
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