Instances in python

Question

I created the following example to understand the instances in python

import time;
class test:
    mytime = time.time();   
    def __init__(self):
        #self         


        

Answer 1

let's uncomment "self.mytime = time.time()" line from your code:

class test:
    mytime = time.time();   
    def __init__(self):
        self.newtime = time.time();
        time.sleep(1);
        #pass - no use of pass here


test1 = test()
test2 = test()

print test1.mytime
o/p: 1347883057.638443
print test2.mytime
o/p: 1347883057.638443

In this case, "mytime" variable is like static class member. and all instances of test() class (i.e: test1 and test2) will share same value of class attributes.

print test1.newtime
o/p: 1347883063.421356

print test2.newtime
o/p: 1347883068.7103591

whereas, value of instance variable. will be different for each instance of class.

therefore, to get different timing for each instance. you need to declare instance variable using "self" in "init" method.

• self = instance as a first parameter in class method
• init = default constructor method in python for defined class

Hope, it will help.