Static Variable in Python

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Static Variable in Python

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#1 by (3 votes)

4

I came from Java. I have a variable in a class that I need to change in more than one method.

I tried to put it global, but it consumed a lot of resources.

How to implement this?

Would it be the same shape as a static variable in Java?

How do I change var of another class in Django?

var = 0
def metodo1():  
var += 1      
def metodo2():  
var += 10

[ Resolved ]

Thanks for your colleague's reply below. I have decided as follows: I created a 'static' class:

class Modulo(object):
    andamento_processo = 0
    def processo(self):
        self.andamento_processo = 1

Now I instantiate it from the other class and change the value when it needs it, it literally looks like a static (java) variable!

class NovaClasse:
    Modulo.andamento_processo = 10

python django

asked by anonymous 17.04.2014 / 02:29

1 answer

Stopping a router when your child router terminates Static Code Analysis - Identify possible division by Zero

score 3 · Answer 1

Object-orientation in Python is a bit different. If you create a variable it is accessible by default. The difference is as follows: If the variable is accessed by an instance of the object, it is an attribute of the object, otherwise it is an attribute of the class.

Example:

class A(object):
   variavel = 1

That way it's an object:

objeto = A()
objeto.variavel

In this way, it would be a device very similar to Java (as you want):

A.variavel

To try to make it clear, imagine that your class has a initializer that changes the value of the variable from 1 to 5. When calling the first code I showed will be returned 5, if the second code is called, it will return 1.

#!/usr/local/bin/python2.7

class A(object):
  variavel = 10

  def __init__(self):
    self.variavel = 15


print A.variavel #resultado 10
print A().variavel #resultado 15

Source for more information: Static variables and methods in Python