/
env.py
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/
env.py
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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")
OSX = sys.platform == "darwin"
# Python implementations.
CPYTHON = (platform.python_implementation() == "CPython")
PYPY = (platform.python_implementation() == "PyPy")
JYTHON = (platform.python_implementation() == "Jython")
IRONPYTHON = (platform.python_implementation() == "IronPython")
# 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] == "+"),)
if PYPY:
PYPYVERSION = sys.pypy_version_info
# Python behavior.
class PYBEHAVIOR:
"""Flags indicating this Python's behavior."""
# Does Python conform to PEP626, Precise line numbers for debugging and other tools.
# https://www.python.org/dev/peps/pep-0626
pep626 = CPYTHON and (PYVERSION > (3, 10, 0, 'alpha', 4))
# Is "if __debug__" optimized away?
if PYPY:
optimize_if_debug = True
else:
optimize_if_debug = not pep626
# Is "if not __debug__" optimized away? The exact details have changed
# across versions.
if pep626:
optimize_if_not_debug = 1
elif PYPY:
if PYVERSION >= (3, 9):
optimize_if_not_debug = 2
elif PYVERSION[:2] == (3, 8):
optimize_if_not_debug = 3
else:
optimize_if_not_debug = 1
else:
if PYVERSION >= (3, 8, 0, 'beta', 1):
optimize_if_not_debug = 2
else:
optimize_if_not_debug = 1
# Can co_lnotab have negative deltas?
negative_lnotab = not (PYPY and PYPYVERSION < (7, 2))
# 3.7 changed how functions with only docstrings are numbered.
docstring_only_function = (not PYPY) and ((3, 7, 0, 'beta', 5) <= PYVERSION <= (3, 10))
# 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 = ((3, 8) <= PYVERSION < (3, 10))
# 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 = (CPYTHON and PYVERSION >= (3, 8)) or (PYPY and PYVERSION >= (3, 9))
# Functions are no longer claimed to start at their earliest decorator even though
# the decorators are traced?
def_ast_no_decorator = (PYPY and PYVERSION >= (3, 9))
# CPython 3.11 now jumps to the decorator line again while executing
# the decorator.
trace_decorator_line_again = (CPYTHON and PYVERSION > (3, 11, 0, 'alpha', 3, 0))
# Are while-true loops optimized into absolute jumps with no loop setup?
nix_while_true = (PYVERSION >= (3, 8))
# CPython 3.9a1 made sys.argv[0] and other reported files absolute paths.
report_absolute_files = (
(CPYTHON or (PYPY and PYPYVERSION >= (7, 3, 10)))
and PYVERSION >= (3, 9)
)
# Lines after break/continue/return/raise are no longer compiled into the
# bytecode. They used to be marked as missing, now they aren't executable.
omit_after_jump = pep626
# PyPy has always omitted statements after return.
omit_after_return = omit_after_jump or PYPY
# Modules used to have firstlineno equal to the line number of the first
# real line of code. Now they always start at 1.
module_firstline_1 = pep626
# Are "if 0:" lines (and similar) kept in the compiled code?
keep_constant_test = pep626
# When leaving a with-block, do we visit the with-line again for the exit?
exit_through_with = (PYVERSION >= (3, 10, 0, 'beta'))
# Match-case construct.
match_case = (PYVERSION >= (3, 10))
# Some words are keywords in some places, identifiers in other places.
soft_keywords = (PYVERSION >= (3, 10))
# Modules start with a line numbered zero. This means empty modules have
# only a 0-number line, which is ignored, giving a truly empty module.
empty_is_empty = (PYVERSION >= (3, 11, 0, 'beta', 4))
# 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'
# Environment COVERAGE_NO_CONTRACTS=1 can turn off contracts while debugging
# tests to remove noise from stack traces.
# $set_env.py: COVERAGE_NO_CONTRACTS - Disable PyContracts to simplify stack traces.
USE_CONTRACTS = (
TESTING
and not bool(int(os.environ.get("COVERAGE_NO_CONTRACTS", 0)))
and (PYVERSION < (3, 11))
)
def debug_info():
"""Return a list of (name, value) pairs for printing debug information."""
info = [
(name, value) for name, value in globals().items()
if not name.startswith("_") and
name not in {"PYBEHAVIOR", "debug_info"} and
not isinstance(value, type(os))
]
info += [
(name, value) for name, value in PYBEHAVIOR.__dict__.items()
if not name.startswith("_")
]
return sorted(info)