有没有办法在Python中访问父模块

# parent_module.py
def parent_function():
    print("This is a function in the parent module.")

if __name__ == "__main__":
    print("This is the parent module.")
    parent_function()

# child_module.py
import parent_module

def child_function():
    print("This is a function in the child module.")

if __name__ == "__main__":
    print("This is the child module.")
    child_function()
    parent_module.parent_function()

This is the parent module.
This is a function in the parent module.

This is the child module.
This is a function in the child module.
This is the parent module.
This is a function in the parent module.