Environment Variables

RULES_PYTHON_REPO_DEBUG

When 1, repository rules will print debug information about what they’re doing. This is mostly useful for development to debug errors.

RULES_PYTHON_REPO_DEBUG_VERBOSITY

Determines the verbosity of logging output for repo rules. Valid values:

  • DEBUG

  • INFO

  • TRACE

RULES_PYTHON_REPO_TOOLCHAIN_VERSION_OS_ARCH

Determines the python interpreter platform to be used for a particular interpreter (version, os, arch) triple to be used in repository rules. Replace the VERSION_OS_ARCH part with actual values when using, e.g. 3_13_0_linux_x86_64. The version values must have _ instead of . and the os, arch values are the same as the ones mentioned in the //python:versions.bzl file.

RULES_PYTHON_PIP_ISOLATED

Determines if --isolated is used with pip.

Valid values:

  • 0 and false mean to not use isolated mode

  • Other non-empty values mean to use isolated mode.

RULES_PYTHON_BZLMOD_DEBUG

When 1, bzlmod extensions will print debug information about what they’re doing. This is mostly useful for development to debug errors.

RULES_PYTHON_ENABLE_PYSTAR

When 1, the rules_python Starlark implementation of the core rules is used instead of the Bazel-builtin rules. Note this requires Bazel 7+.

RULES_PYTHON_BOOTSTRAP_VERBOSE

When 1, debug information about bootstrapping of a program is printed to stderr.

VERBOSE_COVERAGE

When 1, debug information about coverage behavior is printed to stderr.

RULES_PYTHON_GAZELLE_VERBOSE

When 1, debug information from gazelle is printed to stderr.