Cross-package reference of Python

Cross-package reference method of Python

Assume that the package hierarchy is as follows:

Package1/_ init _. py subpack1/_ init _. py module_11.py module_12.py module_13.py subpack2/_ init _. py module_21.py module_22.py

Now, if module_21 in subpack2 needs to reference funca of module module_11 in subpack1, the reference syntax is:

From subpack1.module _ 11 import funca

However, this reference has a disadvantage: When the module module_21 runs in the IF _ name __= = "_ main _" mode, the following error occurs:

No module named subpack1.module _ 11

Other scripts can only be run in the IF _ name __= = "_ main _" Mode Under the package1 directory.