sthira 0.1.0

The `Constant` class is a metaclass for creating classes with constant attributes

Sthira

The word for "constant" in Sanskrit can be translated as "स्थिर" (sthira)

The Constant class is a metaclass for creating classes with constant attributes. Once set, the attributes of a Constant class cannot be changed, and new attributes cannot be added. This allows for creating classes that represent unchangeable values, such as constants, enums, and similar constructs. The Constant class also provides a __str__and __repr__ implementation for convenient representation of the class.

Usage

from sthira import constant


@constant
class Mammal:
	HUMAN = "human"
	TIGER = "tiger"
	LION = "lion"

class Bird:
	CROW = "crow"
	HAWK = "hawk"

class Fish:
	TUNA = "tuna"

@constant
class Animal:
	MAMMAL = Mammal
	BIRD = Bird
	FISH = Fish

print(f"{Animal.MAMMAL}")
print(f"{Animal.MAMMAL.HUMAN}")
print(f"{Animal.BIRD.CROW}")

Output

Mammal
human
crow

Cannot modify attributes

Animal.MAMMAL.HUMAN = "HomoSapiens"

#     raise AttributeError("Cannot set or change the class attributes")
# AttributeError: Cannot set or change the class attributes

Unit tests

python -m unittest test_constant.py