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Q&A Different behavior with relative imports when using flask vs py

I don't have a py command on my system; for purposes of this answer I assume it's an alias to the python executable. Running a script from a file is not quite the same as importing it. A script giv...

posted 4y ago by ajv‭  ·  edited 4y ago by ajv‭

Answer
#2: Post edited by user avatar ajv‭ · 2020-08-11T01:44:22Z (over 4 years ago)
  • I don't have a `py` command on my system; for purposes of this answer I assume it's an alias to the python executable.
  • Running a script from a file is not quite the same as importing it. A script given on the command line doesn't know it's a package (`__package__` is not set). That's why relative imports don't work.
  • What you probably want is to run it by module path, not filename. Assuming your top-level project directory is named `yourapp`:
  • ```
  • python3 -m yourapp.app
  • ```
  • Run this from somewhere that `yourapp` is importable. Unless you've done something odd with PYTHONPATH, the parent of your top-level project directory should work.
  • (even better would be to make a setup.py and use it to pip-install the package; then your working directory won't matter. But you specified no structural changes, so.)
  • I don't have a `py` command on my system; for purposes of this answer I assume it's an alias to the python executable.
  • Running a script from a file is not quite the same as importing it. A script given on the command line doesn't know it's a package (`__package__` is not set). That's why relative imports don't work.
  • What you probably want is to run it by module path, not filename. Assuming your top-level project directory is named `yourapp`:
  • ```
  • python3 -m yourapp.app
  • ```
  • Run this from somewhere that `yourapp` is importable. Unless you've done something odd with PYTHONPATH, the parent of your top-level project directory should work. You can check importability from the current directory with `python3 -c 'import yourapp'` or similar.
  • (even better would be to make a setup.py and use it to pip-install the package; then your working directory won't matter. But you specified no structural changes, so.)
#1: Initial revision by user avatar ajv‭ · 2020-08-11T01:40:20Z (over 4 years ago)
I don't have a `py` command on my system; for purposes of this answer I assume it's an alias to the python executable.

Running a script from a file is not quite the same as importing it. A script given on the command line doesn't know it's a package (`__package__` is not set). That's why relative imports don't work.

What you probably want is to run it by module path, not filename. Assuming your top-level project directory is named `yourapp`:

```
python3 -m yourapp.app
```

Run this from somewhere that `yourapp` is importable. Unless you've done something odd with PYTHONPATH, the parent of your top-level project directory should work.

(even better would be to make a setup.py and use it to pip-install the package; then your working directory won't matter. But you specified no structural changes, so.)