Define a Python Library Target

Problem

You need to turn your Python project into a library target that other libraries in your Pants workspace can use as a dependency.

If you need to create an executable Python binary target instead, see Specify a Python Executable (PEX).

Solution

Define a python_library target definition that designates the library's source files, dependencies, and more.

Discussion

A python_library target definition should specify the following:

• A name for the target
• Either a single source Python file or a list of sources
• A list of dependencies (optional)

Here is an example target definition:

python_library(name='my-python-lib',
  sources=globs('*.py'),
  dependencies=[
    'server/src/python:server-lib',
    'client/src/python:client-lib',
    'static/json:config'
  ],
)

Now, another library or binary can depend on the target you created:

dependencies=[
  'myproject/src/python:my-python-lib'
]

See Also

• Specify a Python Executable (PEX)
• Add a Dependency on Another Target