Python，模块，importError

Question

I have a problem while importing class from another package. Unfortunately importError occurs. I will enclose project structure to visualize my problem. Import error occurs when adding 'import A' statement.

Class 'Derived' and 'Base' are placed in folder called 'folder'

from folder.Derived import Derived
class A:
   pass

import A
#The line above causes importError
class Base:
   pass

from folder.Base import Base
class Derived(Base):
   pass

Answer 1

您不能从A导入A，因为您没有A。如果A用于衍生用途：

 from Derived import A