CODEWITHSUNDEEP
javapython
user285594
user285594

Reputation:

How can I do this similar public static declarations to Java in Python?

In my Java I have a central boot loader which keeps on boot all default values as public static or private static, and later when require I can go to other class/threads and access them to do modify etc. For example: 

public class main extends JWindow implements MouseListener, MouseMotionListener {

  private static boolean isDetect = true;
  public  static String  vncMode  = "1980";
  ...

  public main() { 
    vncMode = C.readIni("vncmode"); // 1980
  }    
}

public class TCPHandler implements Runnable {
  import main.*;
  public void run() {
    if (main.vncMode.equals("1999" ) || 
        main.vncMode.equals("2013")) {
      echo(main.vncMode, RED);
    } else {
      echo(main.vncMode, GREEN);
    }
  }
}

Similar to Java, in Python, How can i set public static/private static declarations, so that i can have access from any other class of that value?

python1.py:

from bgcolors import bgcolors
class Python1(object):
  isDetect = True  
  def run(self):
    # expecting vncMode = 1980
    print bgcolors.RED +  "we are now in 1999: from version: " + vncMode

python2.py:

from bgcolors import bgcolors
class Python2(object):
  isDetect = True  
  def run(self):
    # expecting vncMode = 1980
    print bgcolors.RED + "we are now in 2013: from version: " + vncMode

main.py:

from bgcolors import bgcolors
from python1 import Python1
from python2 import Python2

vncMode = "1980"

a = Python1()
a.run()

b = Python2()
b.run()

How can i set the value 1980 and in all class get 1980 ?

Upvotes: 0

Views: 77

Answers (2)

Tritium21
Tritium21

Reputation: 2932

While I would normally use an argument to __init__, and explicitly pass the value to each instance upon creation, python has the global keyword to do something along the lines of what you are asking.

a_name = "A Value"

class Sample(object):
    def a_method(self):
        global a_name
        print a_name

sample_instance = Sample()
sample_instance.a_method()  # prints "A Value"

but you really should do something like...

a_name = "A Value"

class Sample2(object):
    def __init__(self, value):
        self.value = value
    def a_method(self):
        print self.value

sample_instance = Sample2(a_name)
sample_instance.a_method()  # prints "A Value"

Upvotes: 0

Veedrac
Veedrac

Reputation: 60147

If you have a container that stores the attributes you want to share

# example, could be a simple tuple, a full class or instance or dictionary, etc.
attributes = namedtuple("attributes", "vncmode")("1980")

you can pass the attributes to all of the classes on initialisation:

class ...:
    def __init__(self, attributes, ...):
        self.attributes = attributes

and then the instances can use self.attributes.vncmode as a shared mutable value.

Upvotes: 1

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