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1. Top results related to define class in python

   • Define Python class in separate file

     Top Answer

     Answered Feb 15, 2018 · 5 votes

     I believe that the answer choosen as answer is not fully correct.

     It seems that File1.py

     is your main script which is executed, and File2.py is a module which contains a class you wish to use in File1.py

     Also based on a previous question of the OP I would like to suggest the following structure:

     File1.py and File2.py are located in the same direcory

     File1.py

     import MongoEnginefrom File2 import Book-me = MongoEngine(app)-# according to the documentation# you do need to pass args/values in the following linemy_book = Book(me.Document(*args, **values))# then do something with my_book# which is now an instance of the File2.py class Book-

     File2.py

     import MongoEngine-class Book(MongoEngine.Document):- def __init__(self, *args, **kwargs): super(Book, self).__init__(*args, **kwargs) # you can add additional code here if needed- def my_additional_function(self): #do something return True-

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     1/5

   • Define a setter in a class in Python?

     Top Answer

     Answered Aug 04, 2021 · 0 votes

     I misunderstood the goal of OP. The class property is well suited for getting and setting properties while keeping the attributes hidden to the user. This is needed for protecting some internal variables or possibly for having side effects when values are got or set.

     What I missed from the post was the word "large." If each object is initialized with a large dict, it's probably best to leave it be and define some helper functions to retrieve and set keys.

     What's even better is to override the __getattr__

     method, which is called whenever an attribute lookup fails and the __setattr__

     method, which is called at attribute sets.

     class MyClass: def __init__(self, tmp_dict): object.__setattr__(self, '_vals', tmp_dict) self.other_attr = 1234 def __getattr__(self, name): try: return self._vals[name] except KeyError: raise AttributeError(f"'MyClass' object has no attribute '{name}'") def __setattr__(self, name, val): if hasattr(self, '_vals') and name in self._vals.keys(): self._vals[name] = val else: object.__setattr__(self, name, val)-

     Then you can access the key val1 with the usual syntax, as well as other attributes

     >>> tmp_dict = {"val1": 1, "val2": 2, "val3": 1, "val100": 123}>>> obj = MyClass(tmp_dict)>>> obj.val11>>> obj.other_attr1234-

     And you can also set them

     >>> obj.val2 = 90>>> obj.val290-

     Notice that now you can really pretend that val1 is an attribute, which gets rid of that cumbersome get('val1') or set('val2', 90).

     Two remarks:

     • The ugly object.__setattr__(self, name, val) is needed to avoid infinite loops that call __setattr__ over and over
     • I added an underscore to the attribute _val. This has no syntactic meaning in Python, but it serves to signal to your users that _val is an internal attribute and it should be interacted with only through the provided object methods.

     Edit: I realized later that the __setattr__ method performs two key lookups: one to tell whether an attribute exists and one to set it if it does. This may be unnecessarily slow so take this answer with the necessary precautions.

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     2/5

   • Define a class with another class object in Python

     Top Answer

     Answered Jul 06, 2021 · 0 votes

     One way to do something like that is to define the __init__ of OutputFile to recognize when it has one input parameter:

     def __init__(self, foo, bar=None): if bar is None: # Passing in an existing object bar = foo.bar foo = foo.foo super().__init__(foo, bar)

     You can even avoid the call to super().__init__ by modifying InputFile.__init__ directly, instead of adding an unnecessary initializer to OutputFile.

     Both options assume that you store the inputs foo and bar somewhere in your object. If not, you will have to generate them from the existing object somehow, or rewrite __init__ to behave differently in case of a single input.

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     3/5

   • Python define class functions in seperate py file

     Top Answer

     Answered Jul 15, 2016 · 0 votes

     Use mix-in classes:

     # In a.pyclass A(object): def a1(self): self.var=3- def a2(self): self.b1(4)# In b.pyclass B(object): def b1(self, x): self.var=x def b2(self): self.a1()# In testclass.pyclass Test(A, B): def __init__(self): self.var=0

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     4/5

   • Define a class with optional argument in Python

     Top Answer

     Answered Jul 11, 2012 · 13 votes

     Try this please:

     def setdata(self, value1, value2 = '000'): Your code here-

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     5/5

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2. www.w3schools.com › python › python_classesPython Classes and Objects - W3Schools

   www.w3schools.com › python › python_classes

   • Cached

   Python Classes/Objects. Python is an object oriented programming language. Almost everything in Python is an object, with its properties and methods. A Class is like an object constructor, or a "blueprint" for creating objects.

3. docs.python.org › 3 › tutorial9. Classes — Python 3.12.6 documentation

   docs.python.org › 3 › tutorial

   • Cached

   4 days ago · Python classes provide all the standard features of Object Oriented Programming: the class inheritance mechanism allows multiple base classes, a derived class can override any methods of its base class or classes, and a method can call the method of a base class with the same name.

4. www.geeksforgeeks.org › python-classes-and-objectsPython Classes and Objects - GeeksforGeeks

   www.geeksforgeeks.org › python-classes-and-objects

   • Cached

   Sep 9, 2024 · How to define a class in Python? To define a class in Python, use the class keyword followed by the class name and a colon (:). Inside the class block, define attributes and methods.

5. realpython.com › python-classesPython Classes: The Power of Object-Oriented Programming

   realpython.com › python-classes

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   Aug 19, 2024 · Python supports the object-oriented programming paradigm through classes. They provide an elegant way to define reusable pieces of code that encapsulate data and behavior in a single entity. With classes, you can quickly and intuitively model real-world objects and solve complex problems.

6. www.programiz.com › python-programming › classPython Classes and Objects (With Examples) - Programiz

   www.programiz.com › python-programming › class

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   Define Python Class. We use the class keyword to create a class in Python. For example, class ClassName: # class definition . Here, we have created a class named ClassName. Let's see an example, class Bike: name = "" gear = 0. Here, Bike - the name of the class; name/gear - variables inside the class with default values "" and 0 respectively.

7. www.tutorialsteacher.com › python › python-classDefine Classes in Python - TutorialsTeacher.com

   www.tutorialsteacher.com › python › python-class

   • Cached

   A class in Python can be defined using the class keyword. class <ClassName>: <statement1> <statement2> . . <statementN>. As per the syntax above, a class is defined using the class keyword followed by the class name and : operator after the class name, which allows you to continue in the next indented line to define class members.

8. www.pythontutorial.net › python-oop › python-classAn Essential Guide to the Python Class By Practical Examples

   www.pythontutorial.net › python-oop › python-class

   • Cached

   Define a class. To define a class in Python, you use the class keyword followed by the class name and a colon. The following example defines a Person class: class Person: pass Code language: Python (python) By convention, you use capitalized names for classes in Python.

9. python.land › objects-and-classesClasses and Objects in Python

   python.land › objects-and-classes

   • Cached

   May 17, 2022 · Learn what a Python class is, how to define one, and how to create Python objects based on a Python class with lots of examples.

10. realpython.com › python3-object-oriented-programmingObject-Oriented Programming (OOP) in Python – Real Python

    realpython.com › python3-object-oriented-programming

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    How Do You Define a Class in Python? In Python, you define a class by using the class keyword followed by a name and a colon. Then you use .__init__() to declare which attributes each instance of the class should have:

11. diveintopython.org › learn › classesOOP in Python: How to Create a Class, Inherit Properties and...

    diveintopython.org › learn › classes

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    May 3, 2024 · In Python, a class is a blueprint for creating objects (also known as instances). It defines a set of attributes (variables) and methods (functions) that the objects created from the class will have. In other words, a class serves as a template or a structure for creating objects with predefined characteristics and behaviors.