The difference in Python between a module and a class.
So I updated my blog to reflect what it's actually turning into: Findings while developing for games and things about the game industry. I'm learning a lot of things quickly on the job, it's hard to keep up! But here's still a fun thing I learned about Python.
The difference in Python between a module and a class.
When you start developing in Python, you might start scripting in a .py file and import libraries, add some member variables, call some functions... Then in another file you can import this module and access these variables and functions by using the '.' operator.
You can also add classes to a module. You can have several classes in a module. A module is a container for some code in Python that can be used and imported by other modules.
A class requires a specific definition, written inside a module, which looks like this:
class MyObject(myParam): def __init__(self): self.obj = "This is a member of MyObject" def myFunction(self): print "This is a function of MyObject"
Classes can be instantiated by another class or modules many, many times and will be different instances (duh.) But when importing a module, you will only have one referenced of that module.
When referencing a variable or calling a function in a class, you use the keyword 'self'
Using the keyword 'self' is needed when referencing functions or variables within a class, for example...
class MyObject(myParam): def __init__(self): self.obj = "This is a member of MyObject" def myFunction(self): self.obj = "I am going to print this instead."
Notice in my definition of myFunction inside class MyObject I reference the member variable 'obj' using 'self.' Without it, Python will be confused whether you're talking about a local or member variable, or some global variable in the module but outside of the class.
I am specifically saying I want to reference the 'obj' of that instance of MyObject.
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