You can run the insertion code immediately after a class is created: class Foo(): … vars=(‘tx’, ‘ty’, ‘tz’) # plus plenty more for v in vars: setattr(Foo, v, 0) Also, you can dynamically store the variable while the class is being created: class Bar: locals()[‘tx’] = ‘texas’
If a constant is not static, Java will allocate a memory for that constant in every object of the class (i.e., one copy of the constant per object). If a constant is static, there will be only one copy of the constant for that class (i.e., one copy per class). Therefore, if the constant has … Read more
Python’s scoping rules for barenames are very simple and straightforward: local namespace first, then (if any) outer functions in which the current one is nested, then globals, finally built-ins. That’s all that ever happens when a barename is looked up, and there’s no need to memorize or apply any complicated rules (nor is there any … Read more
The answer, in a few words In your example, itsProblem is a local variable. Your must use self to set and get instance variables. You can set it in the __init__ method. Then your code would be: class Example(object): def __init__(self): self.itsProblem = “problem” theExample = Example() print(theExample.itsProblem) But if you want a true class … Read more
Instead of bar use self.bar or Foo.bar. Assigning to Foo.bar will create a static variable, and assigning to self.bar will create an instance variable.
Variables declared inside the class definition, but not inside a method are class or static variables: >>> class MyClass: … i = 3 … >>> MyClass.i 3 As @millerdev points out, this creates a class-level i variable, but this is distinct from any instance-level i variable, so you could have >>> m = MyClass() >>> … Read more
The main thing is that by using the CONSTANT notation, you’re making it clear to the reader. the lower case, frozen string gives the impression is might be settable, forcing someone to go back and read the RDoc.
Use self.__class__.classAttr. This should work for both old & new style classes.
A class variable (@@) is shared among the class and all of its descendants. A class instance variable (@) is not shared by the class’s descendants. Class variable (@@) Let’s have a class Foo with a class variable @@i, and accessors for reading and writing @@i: class Foo @@i = 1 def self.i @@i end … Read more
The answer, in a few words In your example, itsProblem is a local variable. Your must use self to set and get instance variables. You can set it in the __init__ method. Then your code would be: class Example(object): def __init__(self): self.itsProblem = “problem” theExample = Example() print(theExample.itsProblem) But if you want a true class … Read more