@Scout I have a monorepo. Can I make one python package depend on another ? Give me an example file structure and setup.py

Yes, you can make one Python package depend on another within a monorepo. The structure of your monorepo and the contents of your

setup.py

files will depend on how you organize your packages. Here's an example of how you might structure your monorepo and configure your

setup.py

files to express dependencies between packages:

monorepo/
│
├── package_a/
│   ├── package_a/
│   │   ├── __init__.py
│   │   └── module_a.py
│   └── setup.py
│
└── package_b/
    ├── package_b/
    │   ├── __init__.py
    │   └── module_b.py
    └── setup.py

In this structure,

package_a

and

package_b

are two separate Python packages within the monorepo. Let's say

package_b

depends on

package_a

. You would express this dependency in

package_b/setup.py

. Here's an example

setup.py

for `package_a`:

python
from setuptools import setup, find_packages

setup(
    name='package_a',
    version='0.0.1',
    description='A brief description of package_a',
    author='Your Name',
    author_email='<mailto:your.email@example.com|your.email@example.com>',
    packages=find_packages(),
    install_requires=[
        # List any dependencies required by package_a here
    ],
)

And here's an example

setup.py

for

package_b

, which depends on `package_a`:

python
from setuptools import setup, find_packages

setup(
    name='package_b',
    version='0.0.1',
    description='A brief description of package_b',
    author='Your Name',
    author_email='<mailto:your.email@example.com|your.email@example.com>',
    packages=find_packages(),
    install_requires=[
        'package_a==0.0.1',  # This line specifies that package_b depends on package_a
    ],
)

In the

install_requires

list of

package_b/setup.py

, you specify the exact version of

package_a

that

package_b

depends on. When you install

package_b

using

pip

, it will automatically install

package_a

as well. To install the packages in editable mode (which is useful for development), you would navigate to each package directory and run:

bash
pip install -e .

This command tells

pip

to install the package in "editable" mode, meaning that changes to the package's source code will immediately affect the installed package without needing to reinstall it. Please note that the version numbers and other metadata in the

setup.py

files should be updated to reflect the actual versions and information of your packages. Python Packages: a Primer for Data Peopl... button Building wheel for multidict (pyproject.... button Best Practices in Structuring Python Pro... button How to add private Python packages to a ... button Thank you for your feedback!

@Scout I want this to work in a dagster cloud deployment. What should I change ? And how does package_b know where package_a is ? (you haven’t specified the path)

In a Dagster Cloud deployment, you would typically package your code and specify your dependencies in a way that can be recognized and installed by the deployment infrastructure. According to the documentation, any dependencies specified in either

requirements.txt

or

setup.py

will be installed automatically by the Dagster Cloud Serverless infrastructure. For

package_b

to know where

package_a

is, you would need to ensure that both packages are included in your deployment and that

package_a

is accessible as an installable package. This can be done by specifying the path to

package_a

relative to

package_b

in the

setup.py

of

package_b

, or by installing

package_a

in your environment before

package_b

. Here's an updated example structure for your monorepo with a single

setup.py

at the root that includes both

package_a

and `package_b`:

monorepo/
│
├── package_a/
│   ├── __init__.py
│   └── module_a.py
│
├── package_b/
│   ├── __init__.py
│   └── module_b.py
│
└── setup.py

And here's an example

setup.py

at the root of the monorepo:

python
from setuptools import setup, find_packages

setup(
    name='monorepo',
    version='0.0.1',
    description='A monorepo containing multiple packages',
    author='Your Name',
    author_email='<mailto:your.email@example.com|your.email@example.com>',
    packages=find_packages(),
    install_requires=[
        # List any third-party dependencies required by both package_a and package_b here
    ],
    extras_require={
        'package_a': [
            # List any additional dependencies specific to package_a here
        ],
        'package_b': [
            'package_a==0.0.1',  # This line specifies that package_b depends on package_a
            # List any additional dependencies specific to package_b here
        ],
    },
)

In this setup, you're using the

extras_require

section to specify dependencies for each package. When deploying to Dagster Cloud, you would build your deployment package from the root of the monorepo, ensuring that both

package_a

and

package_b

are included. To install

package_b

with its dependencies, including the local

package_a

, you would run:

bash
pip install .[package_b]

This command tells

pip

to install the current package (the monorepo) with the extra requirements for

package_b

, which includes

package_a

. When deploying to Dagster Cloud, make sure that your

setup.py

is correctly configured to include all necessary packages and dependencies. The deployment process will handle installing these dependencies based on the configuration you provide in

setup.py

. If you have a more complex setup or need to include packages from private repositories or other sources not accessible to the Dagster Cloud deployment process, you may need to use additional tool