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@python-poetry Poetry

No file/folder found for package my-python-lib when performing poetry build #8324

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smarri4 asked this question in Q&A
No file/folder found for package my-python-lib when performing `poetry build` #8324
@smarri4 smarri4
Aug 16, 2023 · 4 comments · 1 reply
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smarri4
Aug 16, 2023

I have a project structure like below which I also created using poetry:

my-python-lib
|──  my_python_lib
│            |── __init__.py
│            |── app.py
|── README.md
|── __init__.py
|── poetry.lock
|── pyproject.toml
|── report.xml
|── tests
         |── __init__.py
        └── test_app.py

---------------------------------
 git:(main*) $ poetry --version
Poetry (version 1.5.1)
---------------------------------
 git:(main*) $ poetry build
Building my-python-lib (0.1.0)

No file/folder found for package my-python-lib

pyproject.toml

[tool.poetry]
name = "my-python-lib"
version = "0.1.0"
description = "A python library sample"
authors = ["redacted"]
license = "\"Redacted\""
readme = "README.md"
packages = [{include = "my_python_lib", format = "wheel"}]

[tool.poetry.dependencies]
python = "3.11.4"
...
requests = "^2.31.0"


[tool.poetry.group.dev.dependencies]
pytest = "^7.4.0"

[build-system]
requires = ["poetry-core"]
build-backend = "poetry.core.masonry.api"

I've referred to this issue: #512 and discussion: https://github.com/orgs/python-poetry/discussions/7564 , but it does not solve the error that I am facing. Can someone tell what I am doing wrong. Do the project name and the package name have to be the same?
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Replies: 4 comments · 1 reply

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smarri4
Aug 16, 2023
Author

I went ahead and added print statements to the poetry core masonry module.py, looks like it doesn't get the packages included in the pyproject.toml. It prints them as empty:
image

git:(main*) $ poetry build -v
Using virtualenv: /Users/<user>/Library/Caches/pypoetry/virtualenvs/my-python-lib-hUq4-ovD-py3.11
Building my-python-lib (0.1.0)
my_python_lib   /Users/<user>/code/my-python-lib False [] [] []

  ModuleOrPackageNotFound

  No file/folder found for package my-python-lib

  at venv/lib/python3.11/site-packages/poetry/core/masonry/utils/module.py:71 in __init__
       67│                             "from": str(src.relative_to(self._path)),
       68│                         }
       69│                     ]
       70│                 else:
    →  71│                     raise ModuleOrPackageNotFound(
       72│                         f"No file/folder found for package {name}"
       73│                     )
       74│ 
       75│         for package in packages:
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smarri4
Aug 16, 2023
Author

I am not sure why you have it like this, but in /poetry/core/masonry/builders/builder.py, its written in a way that poetry build wont work if format is specified like I did packages = [{include = "my_python_lib", format = "wheel"}] because of the below code:

            if (
                    formats
                    and self.format
                    and self.format not in formats
                    and not ignore_packages_formats
            ):
                continue

I am looking to see if there is a workaround, but this seems like pretty basic mistake
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kvanbrabant
Mar 20, 2024

Make sure you name your package with underscores instead of hyphens, so: my_python_lib and also refer to it as such in your *.toml file.
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@dezza
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dezza Mar 29, 2025

This is a very important detail, for others with similar issue!

Do not use - in package name or entry-points or you'll be stuck here.
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choosy
Apr 19, 2024

I second that, what @smarri4 said, I hit the same problem. I removed format = "wheel" from there and it worked.
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