Lecture Notes: Understanding the Deprecation of Typing Module in Python

Introduction

• Topic: Changes in the Python typing module and its deprecation since Python 3.9.
• Main Concern: The deprecation has been implicit, causing surprise and frustration among developers.

Key Points

Importing Modules

• Import typing as T and collections.abc as C.
• Example: Creating a say_hello function using Iterable type from typing.

Example Function: say_hello

• Function: Takes names as an iterable type and returns None.
• Usage: Works fine with iterable types like lists, but not with integers or other non-iterable types.
• Testing: Running mypy on the file shows no issues, despite the deprecation.

Deprecation Details

• typing.Iterable and similar types are deprecated since Python 3.9.
• Documentation: Deprecation noted only in official documentation, not indicated by tools like mypy or PyCharm.
• Recommendation is to use collections.abc for collection types.

Example Function: repeat

• Function: Uses Callable type for repeating a function a specified number of times.
• Deprecation: Similar issue as Iterable, with Callable being a deprecated alias to collections.abc.Callable.

Implicit Changes

• Frustration: Changes are implicit with no warnings, leading to confusion.
• Documentation: Updates are not generating deprecation warnings, potentially due to runtime impact concerns.

Response to Change

• Developers need to adapt quickly to these changes.
• Criticism: Lack of clear communication and decision-making in the deprecation process.

Conclusion

• Community Feedback: Encourages comments on awareness and opinions about the change.
• Personal Reflection: Questions personal responsibility in keeping up with documentation.

Closing Remarks

• Engagement: Encourages sharing thoughts in the comments.
• Acknowledgment: Thanks viewers for watching and promises more updates in future videos.