On Wed, May 26, 2021 at 02:09:58AM +1000, Chris Angelico wrote:
> Remember: The thing that you declare Final will, some day, need to be
> changed. Probably as part of your own test suite (you do have one of
> those, right?). With MyPy, you could tell it not to validate that
> line, or that file. With a naming convention, you can explain the need
> for the change with a comment. How are you going to override the
> language feature?
That depends on how it is implemented. Here are some thoughts. Given:
constant spam = "spam and eggs"
we might be able to change it like this:
# Rebinding a constant raises a warning. Just ignore the warning.
try:
spam = "spam spam spam spam"
except Warning:
pass
# Write directly to the namespace.
globals()['spam'] = "spam spam spam spam"
# Command line switch or environment variable.
python3.11 --no-constants testsuite.py
# Context manager.
with ConstantEnforcement(False):
spam = "spam spam spam spam"
# Special backdoor.
sys.setconstant('spam', "spam spam spam spam")
Enforcing constantness doesn't necessarily imply there is no way to
disable or work around it. Especially in a consenting adults language
like Python, I would expect that there will be.
(Most likely just write directly to the namespace.)
--
Steve
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