python:NameError:导入整个包时未定义名称“first”

当我导入整个包裹时,它会给我一个 NameError 。但是,当我导入单个模块并运行相同的代码时,它会正常执行。

我的结构是:

• my_package/目录
  • __init__.py
  • first.py
  • second.py
  • main.py

当我按如下方式运行main.py时,它会给我一个 命名错误 :

import my_package
first.say_1st()
second.say_2nd()

"C:\\Program Files\\Python312\\python.exe" "D:\\E Drive\\Training\\pythonProject1\\Sample scripts\\Package example\\main.py"
Traceback (most recent call last):
File "D:\\E Drive\\Training\\pythonProject1\\Sample scripts\\Package example\\main.py", line 4, in \<module\>
first.say_1st()
^^^^^
NameError: name 'first' is not defined. Did you mean: 'list'?

Process finished with exit code 1

但当我奔跑时 main.py 如下所示,它为我提供了预期的输出。

from my_package import first
first.say_1st()

from my_package import second
second.say_2nd()

我做错什么了吗?