python_source

A single Python source file.

Backend: pants.backend.python

source

type: str
required

A single file that belongs to this target.

Path is relative to the BUILD file's directory, e.g. source='example.ext'.

dependencies

type: Iterable[str] | None
default: None

Addresses to other targets that this target depends on, e.g. ['helloworld/subdir:lib', 'helloworld/main.py:lib', '3rdparty:reqs#django'].

This augments any dependencies inferred by Pants, such as by analyzing your imports. Use pants dependencies or pants peek on this target to get the final result.

See Targets and BUILD files for more about how addresses are formed, including for generated targets. You can also run pants list :: to find all addresses in your project, or pants list dir to find all addresses defined in that directory.

If the target is in the same BUILD file, you can leave off the BUILD file path, e.g. :tgt instead of helloworld/subdir:tgt. For generated first-party addresses, use ./ for the file path, e.g. ./main.py:tgt; for all other generated targets, use :tgt#generated_name.

You may exclude dependencies by prefixing with !, e.g. ['!helloworld/subdir:lib', '!./sibling.txt']. Ignores are intended for false positives with dependency inference; otherwise, simply leave off the dependency from the BUILD file.

description

type: str | None
default: None

A human-readable description of the target.

Use pants list --documented :: to see all targets with descriptions.

interpreter_constraints

type: Iterable[str] | None
default: None

The Python interpreters this code is compatible with.

Each element should be written in pip-style format, e.g. CPython==2.7.* or CPython>=3.6,<4. You can leave off CPython as a shorthand, e.g. >=2.7 will be expanded to CPython>=2.7.

Specify more than one element to OR the constraints, e.g. ['PyPy==3.7.*', 'CPython==3.7.*'] means either PyPy 3.7 or CPython 3.7.

If the field is not set, it will default to the option [python].interpreter_constraints.

See Interpreter compatibility for how these interpreter constraints are merged with the constraints of dependencies.

resolve

type: str | None
default: None

The resolve from [python].resolves to use.

If not defined, will default to [python].default_resolve.

All dependencies must share the same value for their resolve field.

restartable

type: bool
default: False

If true, runs of this target with the run goal may be interrupted and restarted when its input files change.

run_goal_use_sandbox

type: bool | None
default: None

Whether to use a sandbox when running this target. Defaults to [python].run_goal_use_sandbox.

If true, runs of this target with the run goal will copy the needed first-party sources into a temporary sandbox and run from there.

If false, runs of this target with the run goal will use the in-repo sources directly.

The former mode is more hermetic, and is closer to building and running the source as it were packaged in a pex_binary. Additionally, it may be necessary if your sources depend transitively on "generated" files which will be materialized in the sandbox in a source root, but are not in-repo.

The latter mode is similar to creating, activating, and using a virtual environment when running your files. It may also be necessary if the source being run writes files into the repo and computes their location relative to the executed files. Django's makemigrations command is an example of such a process.

skip_add_trailing_comma

type: bool
default: False
backend: pants.backend.experimental.python.lint.add_trailing_comma

If true, don't run add-trailing-comma on this target's code.

skip_autoflake

type: bool
default: False
backend: pants.backend.python.lint.autoflake

If true, don't run Autoflake on this target's code.

skip_bandit

type: bool
default: False
backend: pants.backend.python.lint.bandit

If true, don't run Bandit on this target's code.

skip_black

type: bool
default: False
backend: pants.backend.python.lint.black

If true, don't run Black on this target's code.

skip_docformatter

type: bool
default: False
backend: pants.backend.python.lint.docformatter

If true, don't run Docformatter on this target's code.

skip_flake8

type: bool
default: False
backend: pants.backend.python.lint.flake8

If true, don't run Flake8 on this target's code.

skip_isort

type: bool
default: False
backend: pants.backend.python.lint.isort

If true, don't run isort on this target's code.

skip_mypy

type: bool
default: False
backend: pants.backend.python.typecheck.mypy

If true, don't run MyPy on this target's code.

skip_pydocstyle

type: bool
default: False
backend: pants.backend.python.lint.pydocstyle

If true, don't run pydocstyle on this target's code.

skip_pylint

type: bool
default: False
backend: pants.backend.python.lint.pylint

If true, don't run Pylint on this target's code.

skip_pyupgrade

type: bool
default: False
backend: pants.backend.python.lint.pyupgrade

If true, don't run pyupgrade on this target's code.

skip_ruff

type: bool
default: False
backend: pants.backend.experimental.python.lint.ruff

If true, don't run ruff on this target's code.

skip_yapf

type: bool
default: False
backend: pants.backend.python.lint.yapf

If true, don't run yapf on this target's code.

tags

type: Iterable[str] | None
default: None

Arbitrary strings to describe a target.

For example, you may tag some test targets with 'integration_test' so that you could run pants --tag='integration_test' test :: to only run on targets with that tag.