python tutorial - Python Class | Class or Static Variables in Python - learn python - python programming

  • Class or static variables are shared by all objects. Instance or non-static variables are different for different objects (every object has a copy of it).
  • For example, let a Computer Science Student be represented by class CSStudent. The class may have a static variable whose value is “cse” for all objects. And class may also have non-static members like name and roll.
  • In C++ and Java, we can use static keyword to make a variable as class variable. The variables which don’t have preceding static keyword are instance variables.
  • The Python approach is simple, it doesn’t require a static keyword. All variables which are assigned a value in class declaration are class variables. And variables which are assigned values inside class methods are instance variables.

python - Sample - python code :

# Python program to show that the variables with a value 
# assigned in class declaration, are class variables
# Class for Computer Science Student
class CSStudent:
    stream = 'cse'                  # Class Variable
    def __init__(self,name,roll): = name            # Instance Variable
        self.roll = roll            # Instance Variable
# Objects of CSStudent class
a = CSStudent('wiki', 1)
b = CSStudent('techy', 2)
print(  # prints "cse"
print(  # prints "cse"
print(    # prints "wiki"
print(    # prints "techy"
print(a.roll)    # prints "1"
print(b.roll)    # prints "2"
# Class variables can be accessed using class
# name also
print( # prints "cse"



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