Create a constant in Python

Question

Is there a way to declare a constant in Python? In Java we can create constant values in this manner:

public static final String CONST_NAME = "Name";

What is the equivalent of the above Java constant declaration in Python?

Answer 1

No there is not. You cannot declare a variable or value as constant in Python. Just don't change it.

If you are in a class, the equivalent would be:

class Foo(object): CONST_NAME = "Name"

if not, it is just

CONST_NAME = "Name"

You can also use namedtuple to create constants:

>>> from collections import namedtuple
>>> Constants = namedtuple('Constants', ['pi', 'e'])
>>> constants = Constants(3.14, 2.718)
>>> constants.pi 3.14
>>> constants.pi = 3
Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
AttributeError: can't set attribute

Hope this helps!!

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Thanks!