__init__.py is a special file that designates a directory as a Python package. You can leverage it to perform powerful package-level operations that go beyond a simple empty file, including managing the public API, handling circular dependencies, and dynamic module loading.
To define a property that can be a string or null in OpenAPI (Swagger), you use different methods depending on the OpenAPI specification version.
To fix a detached HEAD in Git, you need to save your work by creating a new branch or by checking out an existing one. A detached HEAD occurs when you check out a specific commit, tag, or a remote branch's commit instead of a local branch name (1). In this state, any new commits you make are not part of any branch, making them easy to lose.
The HEAD pointer in Git usually points to the tip of a branch (e.g., main, feature-a). A detached HEAD means the pointer is pointing directly to a commit instead of a branch.