fix(types): Replace custom TYPE_CHECKING with stdlib typing.TYPE_CHECKING

[dev-satoshi]

This commit replaces the custom TYPE_CHECKING constant in _types.py with the standard library's typing.TYPE_CHECKING. This change simplifies the code and removes unnecessary backward compatibility for Python versions below 3.6. Since the _types module is private, this update does not introduce any breaking changes.

Closes #3426

[sentrivana]

Hey @dev-satoshi, thank you for the quick PR!

This works, but I'd prefer if we could remove the TYPE_CHECKING constant from _types.py completely and update all our usages of it in the code to instead import TYPE_CHECKING from typing. A quick search for from sentry_sdk._types import TYPE_CHECKING should give you all the occurrences (heads up, it's quite a lot).

[dev-satoshi]

@sentrivana
Got it! I’ll take care of it!

[dev-satoshi]

@sentrivana
It's done!
Could you please review this when you have a moment?

[dev-satoshi]

There are two import statements in this file, so it's better to remove one of them, right?

[dev-satoshi]

I removed the try-except block since we are now supporting Python 3.6 and above.

[sentrivana]

Thank you @dev-satoshi! Looks good to me :)

[codecov]

❌ 4 Tests Failed:

Tests completed	Failed	Passed	Skipped
110	4	106	0

View the top 3 failed tests by shortest run time

tests.integrations.aws_lambda.test_aws�test_init_error[python3.9]

Stack Traces | 8.88s run time

.../integrations/aws_lambda/test_aws.py:334: in test_init_error
    (event,) = envelope_items
E   ValueError: not enough values to unpack (expected 1, got 0)

tests.integrations.aws_lambda.test_aws�test_init_error[python3.11]

Stack Traces | 8.88s run time

.../integrations/aws_lambda/test_aws.py:334: in test_init_error
    (event,) = envelope_items
E   ValueError: not enough values to unpack (expected 1, got 0)

tests.integrations.aws_lambda.test_aws�test_init_error[python3.10]

Stack Traces | 8.95s run time

.../integrations/aws_lambda/test_aws.py:334: in test_init_error
    (event,) = envelope_items
E   ValueError: not enough values to unpack (expected 1, got 0)

To view individual test run time comparison to the main branch, go to the Test Analytics Dashboard

[sentrivana]

Just fyi, I've pushed a commit that reorders some of the imports (e.g. if the typing import is in the middle of sentry_sdk imports, I move it directly to the if TYPE_CHECKING block). Will merge this as soon as the tests are happy.

[sentrivana]

All is looking good except for the AWS Lambda tests (this has nothing to do with this PR, we need to fix this on master). We'll probably get around to fixing this early next week and then we can merge this.

Nothing additional needed from your side @dev-satoshi -- thanks again for the contribution, we'll see that this is merged next week!