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Class or Static Variables in Python?
When we declare a variable inside a class but outside any method, it is called as class or static variable in python. Class or static variable can be referred through a class but not directly through an instance.
Class or static variable are quite distinct from and does not conflict with any other member variable with the same name. Below is a program to demonstrate the use of class or static variable −
Example
class Fruits(object):
count = 0
def __init__(self, name, count):
self.name = name
self.count = count
Fruits.count = Fruits.count + count
def main():
apples = Fruits("apples", 3);
pears = Fruits("pears", 4);
print (apples.count)
print (pears.count)
print (Fruits.count)
print (apples.__class__.count) # This is Fruit.count
print (type(pears).count) # So is this
if __name__ == '__main__':
main()Result
3 4 7 7 7
Another example to demonstrate the use of variable defined on the class level −
Example
class example: staticVariable = 9 # Access through class print (example.staticVariable) # Gives 9 #Access through an instance instance = example() print(instance.staticVariable) #Again gives 9 #Change within an instance instance.staticVariable = 12 print(instance.staticVariable) # Gives 12 print(example.staticVariable) #Gives 9
output
9 9 12 9
Updated on: 30-Jul-2019
6K+ Views
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