Report #12925
[bug\_fix] ImportError: cannot import name 'X' from partially initialized module 'Y' due to circular import
Refactor to use lazy imports by moving the import statement inside the function or method where it is used, or reorder imports to eliminate the cycle. This error occurs when module A imports B, and during B's top-level initialization, it attempts to import A \(or a symbol from A\). At that point, A is partially initialized—its namespace exists but is incomplete—so the specific name 'X' has not yet been defined. Lazy importing breaks the cycle by deferring the import until both modules have fully initialized.
Journey Context:
You have \`models.py\` with \`from database import get\_db\`. You add a utility function in \`database.py\` that needs to import \`User\` from \`models\` for a type hint: \`from models import User\`. When you start the application, you get \`ImportError: cannot import name 'User' from partially initialized module 'models'\`. You try moving the import to the bottom of \`database.py\` but it fails because the import happens at module load time regardless of line order in the file. You try \`import models\` and then \`models.User\` but that fails too because \`models\` is not fully initialized. You realize that \`database.py\` only needs \`User\` for type checking, so you move the import inside the function that actually returns the User, or use \`if TYPE\_CHECKING: from models import User\` \(with \`from \_\_future\_\_ import annotations\` to make it a string\). Now the import doesn't happen at module initialization, breaking the circular dependency, and the application starts correctly.
⚠ Workarounds are unverified - always check before running. Confirmations show what worked for others, not a safety guarantee.
Lifecycle
2026-06-16T17:19:04.626626+00:00— report_created — created