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# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
"""Determine facts about the environment."""
import os
import platform
import sys
# Operating systems.
WINDOWS = sys.platform == "win32"
LINUX = sys.platform.startswith("linux")
# Python versions. We amend version_info with one more value, a zero if an
# official version, or 1 if built from source beyond an official version.
PYVERSION = sys.version_info + (int(platform.python_version()[-1] == "+"),)
PY2 = PYVERSION < (3, 0)
PY3 = PYVERSION >= (3, 0)
# Python implementations.
PYPY = (platform.python_implementation() == 'PyPy')
if PYPY:
PYPYVERSION = sys.pypy_version_info
PYPY2 = PYPY and PY2
PYPY3 = PYPY and PY3
JYTHON = (platform.python_implementation() == 'Jython')
IRONPYTHON = (platform.python_implementation() == 'IronPython')
# Python behavior
class PYBEHAVIOR(object):
"""Flags indicating this Python's behavior."""
# Is "if __debug__" optimized away?
optimize_if_debug = (not PYPY)
# Is "if not __debug__" optimized away?
optimize_if_not_debug = (not PYPY) and (PYVERSION >= (3, 7, 0, 'alpha', 4))
# Is "if not __debug__" optimized away even better?
optimize_if_not_debug2 = (not PYPY) and (PYVERSION >= (3, 8, 0, 'beta', 1))
# Do we have yield-from?
yield_from = (PYVERSION >= (3, 3))
# Do we have PEP 420 namespace packages?
namespaces_pep420 = (PYVERSION >= (3, 3))
# Do .pyc files have the source file size recorded in them?
size_in_pyc = (PYVERSION >= (3, 3))
# Do we have async and await syntax?
async_syntax = (PYVERSION >= (3, 5))
# PEP 448 defined additional unpacking generalizations
unpackings_pep448 = (PYVERSION >= (3, 5))
# Can co_lnotab have negative deltas?
negative_lnotab = (PYVERSION >= (3, 6)) and not (PYPY and PYPYVERSION < (7, 2))
# Do .pyc files conform to PEP 552? Hash-based pyc's.
hashed_pyc_pep552 = (PYVERSION >= (3, 7, 0, 'alpha', 4))
# Python 3.7.0b3 changed the behavior of the sys.path[0] entry for -m. It
# used to be an empty string (meaning the current directory). It changed
# to be the actual path to the current directory, so that os.chdir wouldn't
# affect the outcome.
actual_syspath0_dash_m = (PYVERSION >= (3, 7, 0, 'beta', 3))
# When a break/continue/return statement in a try block jumps to a finally
# block, does the finally block do the break/continue/return (pre-3.8), or
# does the finally jump back to the break/continue/return (3.8) to do the
# work?
finally_jumps_back = (PYVERSION >= (3, 8))
# When a function is decorated, does the trace function get called for the
# @-line and also the def-line (new behavior in 3.8)? Or just the @-line
# (old behavior)?
trace_decorated_def = (PYVERSION >= (3, 8))
# Are while-true loops optimized into absolute jumps with no loop setup?
nix_while_true = (PYVERSION >= (3, 8))
# Python 3.9a1 made sys.argv[0] and other reported files absolute paths.
report_absolute_files = (PYVERSION >= (3, 9))
# Coverage.py specifics.
# Are we using the C-implemented trace function?
C_TRACER = os.getenv('COVERAGE_TEST_TRACER', 'c') == 'c'
# Are we coverage-measuring ourselves?
METACOV = os.getenv('COVERAGE_COVERAGE', '') != ''
# Are we running our test suite?
# Even when running tests, you can use COVERAGE_TESTING=0 to disable the
# test-specific behavior like contracts.
TESTING = os.getenv('COVERAGE_TESTING', '') == 'True'
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