Python relative import local package module file All In One

Posted 2023-04-27 xgqfrms

Python relative import local package module file All In One

Python relative import local package module file All In One

$ tree
└── project
    ├── package1
    │   ├── module1.py
    │   └── module2.py
    └── package2
        ├── __init__.py
        ├── module3.py
        ├── module4.py
        └── subpackage1
            └── module5.py

Recall the file contents:

package1/module2.py contains a function, function1.
package2/__init__.py contains a class, class1.
package2/subpackage1/module5.py contains a function, function2.

You can import class1 and function2 into the package2/module3.py file this way:

# package2/module3.py

from . import class1
from .subpackage1.module5 import function2

https://realpython.com/absolute-vs-relative-python-imports/

demos

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下级引用上级（相对导包）：SystemError: Parent module '' not loaded, cannot perform relative import

 当在下级中引用上级时，使用相对导包会出错，SystemError: Parent module ‘‘ not loaded, cannot perform relative import

 

 运行test_count.py文件

 

解决方案：在test_count.py文件中加入如下代码，将上上级路径加入到环境变量中，这样引包就不会报错了

import os
import sys
path = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
sys.path.insert(0, path)

 

 

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