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"""Core implementation of the testing process: init, session, runtest loop."""
import argparse
import dataclasses
import fnmatch
import functools
import importlib
import os
import sys
from pathlib import Path
from typing import Callable
from typing import Dict
from typing import FrozenSet
from typing import Iterator
from typing import List
from typing import Optional
from typing import Sequence
from typing import Set
from typing import Tuple
from typing import Type
from typing import TYPE_CHECKING
from typing import Union
import _pytest._code
from _pytest import nodes
from _pytest.compat import final
from _pytest.compat import overload
from _pytest.config import Config
from _pytest.config import directory_arg
from _pytest.config import ExitCode
from _pytest.config import hookimpl
from _pytest.config import PytestPluginManager
from _pytest.config import UsageError
from _pytest.config.argparsing import Parser
from _pytest.fixtures import FixtureManager
from _pytest.outcomes import exit
from _pytest.pathlib import absolutepath
from _pytest.pathlib import bestrelpath
from _pytest.pathlib import fnmatch_ex
from _pytest.pathlib import visit
from _pytest.reports import CollectReport
from _pytest.reports import TestReport
from _pytest.runner import collect_one_node
from _pytest.runner import SetupState
if TYPE_CHECKING:
from typing_extensions import Literal
def pytest_addoption(parser: Parser) -> None:
parser.addini(
"norecursedirs",
"Directory patterns to avoid for recursion",
type="args",
default=[
"*.egg",
".*",
"_darcs",
"build",
"CVS",
"dist",
"node_modules",
"venv",
"{arch}",
],
)
parser.addini(
"testpaths",
"Directories to search for tests when no files or directories are given on the "
"command line",
type="args",
default=[],
)
group = parser.getgroup("general", "Running and selection options")
group._addoption(
"-x",
"--exitfirst",
action="store_const",
dest="maxfail",
const=1,
help="Exit instantly on first error or failed test",
)
group = parser.getgroup("pytest-warnings")
group.addoption(
"-W",
"--pythonwarnings",
action="append",
help="Set which warnings to report, see -W option of Python itself",
)
parser.addini(
"filterwarnings",
type="linelist",
help="Each line specifies a pattern for "
"warnings.filterwarnings. "
"Processed after -W/--pythonwarnings.",
)
group._addoption(
"--maxfail",
metavar="num",
action="store",
type=int,
dest="maxfail",
default=0,
help="Exit after first num failures or errors",
)
group._addoption(
"--strict-config",
action="store_true",
help="Any warnings encountered while parsing the `pytest` section of the "
"configuration file raise errors",
)
group._addoption(
"--strict-markers",
action="store_true",
help="Markers not registered in the `markers` section of the configuration "
"file raise errors",
)
group._addoption(
"--strict",
action="store_true",
help="(Deprecated) alias to --strict-markers",
)
group._addoption(
"-c",
"--config-file",
metavar="FILE",
type=str,
dest="inifilename",
help="Load configuration from `FILE` instead of trying to locate one of the "
"implicit configuration files.",
)
group._addoption(
"--continue-on-collection-errors",
action="store_true",
default=False,
dest="continue_on_collection_errors",
help="Force test execution even if collection errors occur",
)
group._addoption(
"--rootdir",
action="store",
dest="rootdir",
help="Define root directory for tests. Can be relative path: 'root_dir', './root_dir', "
"'root_dir/another_dir/'; absolute path: '/home/user/root_dir'; path with variables: "
"'$HOME/root_dir'.",
)
group = parser.getgroup("collect", "collection")
group.addoption(
"--collectonly",
"--collect-only",
"--co",
action="store_true",
help="Only collect tests, don't execute them",
)
group.addoption(
"--pyargs",
action="store_true",
help="Try to interpret all arguments as Python packages",
)
group.addoption(
"--ignore",
action="append",
metavar="path",
help="Ignore path during collection (multi-allowed)",
)
group.addoption(
"--ignore-glob",
action="append",
metavar="path",
help="Ignore path pattern during collection (multi-allowed)",
)
group.addoption(
"--deselect",
action="append",
metavar="nodeid_prefix",
help="Deselect item (via node id prefix) during collection (multi-allowed)",
)
group.addoption(
"--confcutdir",
dest="confcutdir",
default=None,
metavar="dir",
type=functools.partial(directory_arg, optname="--confcutdir"),
help="Only load conftest.py's relative to specified dir",
)
group.addoption(
"--noconftest",
action="store_true",
dest="noconftest",
default=False,
help="Don't load any conftest.py files",
)
group.addoption(
"--keepduplicates",
"--keep-duplicates",
action="store_true",
dest="keepduplicates",
default=False,
help="Keep duplicate tests",
)
group.addoption(
"--collect-in-virtualenv",
action="store_true",
dest="collect_in_virtualenv",
default=False,
help="Don't ignore tests in a local virtualenv directory",
)
group.addoption(
"--import-mode",
default="prepend",
choices=["prepend", "append", "importlib"],
dest="importmode",
help="Prepend/append to sys.path when importing test modules and conftest "
"files. Default: prepend.",
)
group = parser.getgroup("debugconfig", "test session debugging and configuration")
group.addoption(
"--basetemp",
dest="basetemp",
default=None,
type=validate_basetemp,
metavar="dir",
help=(
"Base temporary directory for this test run. "
"(Warning: this directory is removed if it exists.)"
),
)
def validate_basetemp(path: str) -> str:
# GH 7119
msg = "basetemp must not be empty, the current working directory or any parent directory of it"
# empty path
if not path:
raise argparse.ArgumentTypeError(msg)
def is_ancestor(base: Path, query: Path) -> bool:
"""Return whether query is an ancestor of base."""
if base == query:
return True
return query in base.parents
# check if path is an ancestor of cwd
if is_ancestor(Path.cwd(), Path(path).absolute()):
raise argparse.ArgumentTypeError(msg)
# check symlinks for ancestors
if is_ancestor(Path.cwd().resolve(), Path(path).resolve()):
raise argparse.ArgumentTypeError(msg)
return path
def wrap_session(
config: Config, doit: Callable[[Config, "Session"], Optional[Union[int, ExitCode]]]
) -> Union[int, ExitCode]:
"""Skeleton command line program."""
session = Session.from_config(config)
session.exitstatus = ExitCode.OK
initstate = 0
try:
try:
config._do_configure()
initstate = 1
config.hook.pytest_sessionstart(session=session)
initstate = 2
session.exitstatus = doit(config, session) or 0
except UsageError:
session.exitstatus = ExitCode.USAGE_ERROR
raise
except Failed:
session.exitstatus = ExitCode.TESTS_FAILED
except (KeyboardInterrupt, exit.Exception):
excinfo = _pytest._code.ExceptionInfo.from_current()
exitstatus: Union[int, ExitCode] = ExitCode.INTERRUPTED
if isinstance(excinfo.value, exit.Exception):
if excinfo.value.returncode is not None:
exitstatus = excinfo.value.returncode
if initstate < 2:
sys.stderr.write(f"{excinfo.typename}: {excinfo.value.msg}\n")
config.hook.pytest_keyboard_interrupt(excinfo=excinfo)
session.exitstatus = exitstatus
except BaseException:
session.exitstatus = ExitCode.INTERNAL_ERROR
excinfo = _pytest._code.ExceptionInfo.from_current()
try:
config.notify_exception(excinfo, config.option)
except exit.Exception as exc:
if exc.returncode is not None:
session.exitstatus = exc.returncode
sys.stderr.write(f"{type(exc).__name__}: {exc}\n")
else:
if isinstance(excinfo.value, SystemExit):
sys.stderr.write("mainloop: caught unexpected SystemExit!\n")
finally:
# Explicitly break reference cycle.
excinfo = None # type: ignore
os.chdir(session.startpath)
if initstate >= 2:
try:
config.hook.pytest_sessionfinish(
session=session, exitstatus=session.exitstatus
)
except exit.Exception as exc:
if exc.returncode is not None:
session.exitstatus = exc.returncode
sys.stderr.write(f"{type(exc).__name__}: {exc}\n")
config._ensure_unconfigure()
return session.exitstatus
def pytest_cmdline_main(config: Config) -> Union[int, ExitCode]:
return wrap_session(config, _main)
def _main(config: Config, session: "Session") -> Optional[Union[int, ExitCode]]:
"""Default command line protocol for initialization, session,
running tests and reporting."""
config.hook.pytest_collection(session=session)
config.hook.pytest_runtestloop(session=session)
if session.testsfailed:
return ExitCode.TESTS_FAILED
elif session.testscollected == 0:
return ExitCode.NO_TESTS_COLLECTED
return None
def pytest_collection(session: "Session") -> None:
session.perform_collect()
def pytest_runtestloop(session: "Session") -> bool:
if session.testsfailed and not session.config.option.continue_on_collection_errors:
raise session.Interrupted(
"%d error%s during collection"
% (session.testsfailed, "s" if session.testsfailed != 1 else "")
)
if session.config.option.collectonly:
return True
for i, item in enumerate(session.items):
nextitem = session.items[i + 1] if i + 1 < len(session.items) else None
item.config.hook.pytest_runtest_protocol(item=item, nextitem=nextitem)
if session.shouldfail:
raise session.Failed(session.shouldfail)
if session.shouldstop:
raise session.Interrupted(session.shouldstop)
return True
def _in_venv(path: Path) -> bool:
"""Attempt to detect if ``path`` is the root of a Virtual Environment by
checking for the existence of the appropriate activate script."""
bindir = path.joinpath("Scripts" if sys.platform.startswith("win") else "bin")
try:
if not bindir.is_dir():
return False
except OSError:
return False
activates = (
"activate",
"activate.csh",
"activate.fish",
"Activate",
"Activate.bat",
"Activate.ps1",
)
return any(fname.name in activates for fname in bindir.iterdir())
def pytest_ignore_collect(collection_path: Path, config: Config) -> Optional[bool]:
ignore_paths = config._getconftest_pathlist(
"collect_ignore", path=collection_path.parent, rootpath=config.rootpath
)
ignore_paths = ignore_paths or []
excludeopt = config.getoption("ignore")
if excludeopt:
ignore_paths.extend(absolutepath(x) for x in excludeopt)
if collection_path in ignore_paths:
return True
ignore_globs = config._getconftest_pathlist(
"collect_ignore_glob", path=collection_path.parent, rootpath=config.rootpath
)
ignore_globs = ignore_globs or []
excludeglobopt = config.getoption("ignore_glob")
if excludeglobopt:
ignore_globs.extend(absolutepath(x) for x in excludeglobopt)
if any(fnmatch.fnmatch(str(collection_path), str(glob)) for glob in ignore_globs):
return True
allow_in_venv = config.getoption("collect_in_virtualenv")
if not allow_in_venv and _in_venv(collection_path):
return True
if collection_path.is_dir():
norecursepatterns = config.getini("norecursedirs")
if any(fnmatch_ex(pat, collection_path) for pat in norecursepatterns):
return True
return None
def pytest_collection_modifyitems(items: List[nodes.Item], config: Config) -> None:
deselect_prefixes = tuple(config.getoption("deselect") or [])
if not deselect_prefixes:
return
remaining = []
deselected = []
for colitem in items:
if colitem.nodeid.startswith(deselect_prefixes):
deselected.append(colitem)
else:
remaining.append(colitem)
if deselected:
config.hook.pytest_deselected(items=deselected)
items[:] = remaining
class FSHookProxy:
def __init__(self, pm: PytestPluginManager, remove_mods) -> None:
self.pm = pm
self.remove_mods = remove_mods
def __getattr__(self, name: str):
x = self.pm.subset_hook_caller(name, remove_plugins=self.remove_mods)
self.__dict__[name] = x
return x
class Interrupted(KeyboardInterrupt):
"""Signals that the test run was interrupted."""
__module__ = "builtins" # For py3.
class Failed(Exception):
"""Signals a stop as failed test run."""
@dataclasses.dataclass
class _bestrelpath_cache(Dict[Path, str]):
__slots__ = ("path",)
path: Path
def __missing__(self, path: Path) -> str:
r = bestrelpath(self.path, path)
self[path] = r
return r
@final
class Session(nodes.FSCollector):
Interrupted = Interrupted
Failed = Failed
# Set on the session by runner.pytest_sessionstart.
_setupstate: SetupState
# Set on the session by fixtures.pytest_sessionstart.
_fixturemanager: FixtureManager
exitstatus: Union[int, ExitCode]
def __init__(self, config: Config) -> None:
super().__init__(
path=config.rootpath,
fspath=None,
parent=None,
config=config,
session=self,
nodeid="",
)
self.testsfailed = 0
self.testscollected = 0
self.shouldstop: Union[bool, str] = False
self.shouldfail: Union[bool, str] = False
self.trace = config.trace.root.get("collection")
self._initialpaths: FrozenSet[Path] = frozenset()
self._bestrelpathcache: Dict[Path, str] = _bestrelpath_cache(config.rootpath)
self.config.pluginmanager.register(self, name="session")
@classmethod
def from_config(cls, config: Config) -> "Session":
session: Session = cls._create(config=config)
return session
def __repr__(self) -> str:
return "<%s %s exitstatus=%r testsfailed=%d testscollected=%d>" % (
self.__class__.__name__,
self.name,
getattr(self, "exitstatus", "<UNSET>"),
self.testsfailed,
self.testscollected,
)
@property
def startpath(self) -> Path:
"""The path from which pytest was invoked.
.. versionadded:: 7.0.0
"""
return self.config.invocation_params.dir
def _node_location_to_relpath(self, node_path: Path) -> str:
# bestrelpath is a quite slow function.
return self._bestrelpathcache[node_path]
@hookimpl(tryfirst=True)
def pytest_collectstart(self) -> None:
if self.shouldfail:
raise self.Failed(self.shouldfail)
if self.shouldstop:
raise self.Interrupted(self.shouldstop)
@hookimpl(tryfirst=True)
def pytest_runtest_logreport(
self, report: Union[TestReport, CollectReport]
) -> None:
if report.failed and not hasattr(report, "wasxfail"):
self.testsfailed += 1
maxfail = self.config.getvalue("maxfail")
if maxfail and self.testsfailed >= maxfail:
self.shouldfail = "stopping after %d failures" % (self.testsfailed)
pytest_collectreport = pytest_runtest_logreport
def isinitpath(self, path: Union[str, "os.PathLike[str]"]) -> bool:
# Optimization: Path(Path(...)) is much slower than isinstance.
path_ = path if isinstance(path, Path) else Path(path)
return path_ in self._initialpaths
def gethookproxy(self, fspath: "os.PathLike[str]"):
# Optimization: Path(Path(...)) is much slower than isinstance.
path = fspath if isinstance(fspath, Path) else Path(fspath)
pm = self.config.pluginmanager
# Check if we have the common case of running
# hooks with all conftest.py files.
my_conftestmodules = pm._getconftestmodules(
path,
self.config.getoption("importmode"),
rootpath=self.config.rootpath,
)
remove_mods = pm._conftest_plugins.difference(my_conftestmodules)
if remove_mods:
# One or more conftests are not in use at this fspath.
from .config.compat import PathAwareHookProxy
proxy = PathAwareHookProxy(FSHookProxy(pm, remove_mods))
else:
# All plugins are active for this fspath.
proxy = self.config.hook
return proxy
def _recurse(self, direntry: "os.DirEntry[str]") -> bool:
if direntry.name == "__pycache__":
return False
fspath = Path(direntry.path)
ihook = self.gethookproxy(fspath.parent)
if ihook.pytest_ignore_collect(collection_path=fspath, config=self.config):
return False
return True
def _collectfile(
self, fspath: Path, handle_dupes: bool = True
) -> Sequence[nodes.Collector]:
assert (
fspath.is_file()
), "{!r} is not a file (isdir={!r}, exists={!r}, islink={!r})".format(
fspath, fspath.is_dir(), fspath.exists(), fspath.is_symlink()
)
ihook = self.gethookproxy(fspath)
if not self.isinitpath(fspath):
if ihook.pytest_ignore_collect(collection_path=fspath, config=self.config):
return ()
if handle_dupes:
keepduplicates = self.config.getoption("keepduplicates")
if not keepduplicates:
duplicate_paths = self.config.pluginmanager._duplicatepaths
if fspath in duplicate_paths:
return ()
else:
duplicate_paths.add(fspath)
return ihook.pytest_collect_file(file_path=fspath, parent=self) # type: ignore[no-any-return]
@overload
def perform_collect(
self, args: Optional[Sequence[str]] = ..., genitems: "Literal[True]" = ...
) -> Sequence[nodes.Item]:
...
@overload
def perform_collect( # noqa: F811
self, args: Optional[Sequence[str]] = ..., genitems: bool = ...
) -> Sequence[Union[nodes.Item, nodes.Collector]]:
...
def perform_collect( # noqa: F811
self, args: Optional[Sequence[str]] = None, genitems: bool = True
) -> Sequence[Union[nodes.Item, nodes.Collector]]:
"""Perform the collection phase for this session.
This is called by the default :hook:`pytest_collection` hook
implementation; see the documentation of this hook for more details.
For testing purposes, it may also be called directly on a fresh
``Session``.
This function normally recursively expands any collectors collected
from the session to their items, and only items are returned. For
testing purposes, this may be suppressed by passing ``genitems=False``,
in which case the return value contains these collectors unexpanded,
and ``session.items`` is empty.
"""
if args is None:
args = self.config.args
self.trace("perform_collect", self, args)
self.trace.root.indent += 1
self._notfound: List[Tuple[str, Sequence[nodes.Collector]]] = []
self._initial_parts: List[Tuple[Path, List[str]]] = []
self.items: List[nodes.Item] = []
hook = self.config.hook
items: Sequence[Union[nodes.Item, nodes.Collector]] = self.items
try:
initialpaths: List[Path] = []
for arg in args:
fspath, parts = resolve_collection_argument(
self.config.invocation_params.dir,
arg,
as_pypath=self.config.option.pyargs,
)
self._initial_parts.append((fspath, parts))
initialpaths.append(fspath)
self._initialpaths = frozenset(initialpaths)
rep = collect_one_node(self)
self.ihook.pytest_collectreport(report=rep)
self.trace.root.indent -= 1
if self._notfound:
errors = []
for arg, collectors in self._notfound:
if collectors:
errors.append(
f"not found: {arg}\n(no name {arg!r} in any of {collectors!r})"
)
else:
errors.append(f"found no collectors for {arg}")
raise UsageError(*errors)
if not genitems:
items = rep.result
else:
if rep.passed:
for node in rep.result:
self.items.extend(self.genitems(node))
self.config.pluginmanager.check_pending()
hook.pytest_collection_modifyitems(
session=self, config=self.config, items=items
)
finally:
hook.pytest_collection_finish(session=self)
self.testscollected = len(items)
return items
def collect(self) -> Iterator[Union[nodes.Item, nodes.Collector]]:
from _pytest.python import Package
# Keep track of any collected nodes in here, so we don't duplicate fixtures.
node_cache1: Dict[Path, Sequence[nodes.Collector]] = {}
node_cache2: Dict[Tuple[Type[nodes.Collector], Path], nodes.Collector] = {}
# Keep track of any collected collectors in matchnodes paths, so they
# are not collected more than once.
matchnodes_cache: Dict[Tuple[Type[nodes.Collector], str], CollectReport] = {}
# Directories of pkgs with dunder-init files.
pkg_roots: Dict[Path, Package] = {}
for argpath, names in self._initial_parts:
self.trace("processing argument", (argpath, names))
self.trace.root.indent += 1
# Start with a Session root, and delve to argpath item (dir or file)
# and stack all Packages found on the way.
# No point in finding packages when collecting doctests.
if not self.config.getoption("doctestmodules", False):
pm = self.config.pluginmanager
for parent in (argpath, *argpath.parents):
if not pm._is_in_confcutdir(argpath):
break
if parent.is_dir():
pkginit = parent / "__init__.py"
if pkginit.is_file() and pkginit not in node_cache1:
col = self._collectfile(pkginit, handle_dupes=False)
if col:
if isinstance(col[0], Package):
pkg_roots[parent] = col[0]
node_cache1[col[0].path] = [col[0]]
# If it's a directory argument, recurse and look for any Subpackages.
# Let the Package collector deal with subnodes, don't collect here.
if argpath.is_dir():
assert not names, f"invalid arg {(argpath, names)!r}"
seen_dirs: Set[Path] = set()
for direntry in visit(argpath, self._recurse):
if not direntry.is_file():
continue
path = Path(direntry.path)
dirpath = path.parent
if dirpath not in seen_dirs:
# Collect packages first.
seen_dirs.add(dirpath)
pkginit = dirpath / "__init__.py"
if pkginit.exists():
for x in self._collectfile(pkginit):
yield x
if isinstance(x, Package):
pkg_roots[dirpath] = x
if dirpath in pkg_roots:
# Do not collect packages here.
continue
for x in self._collectfile(path):
key2 = (type(x), x.path)
if key2 in node_cache2:
yield node_cache2[key2]
else:
node_cache2[key2] = x
yield x
else:
assert argpath.is_file()
if argpath in node_cache1:
col = node_cache1[argpath]
else:
collect_root = pkg_roots.get(argpath.parent, self)
col = collect_root._collectfile(argpath, handle_dupes=False)
if col:
node_cache1[argpath] = col
matching = []
work: List[
Tuple[Sequence[Union[nodes.Item, nodes.Collector]], Sequence[str]]
] = [(col, names)]
while work:
self.trace("matchnodes", col, names)
self.trace.root.indent += 1
matchnodes, matchnames = work.pop()
for node in matchnodes:
if not matchnames:
matching.append(node)
continue
if not isinstance(node, nodes.Collector):
continue
key = (type(node), node.nodeid)
if key in matchnodes_cache:
rep = matchnodes_cache[key]
else:
rep = collect_one_node(node)
matchnodes_cache[key] = rep
if rep.passed:
submatchnodes = []
for r in rep.result:
# TODO: Remove parametrized workaround once collection structure contains
# parametrization.
if (
r.name == matchnames[0]
or r.name.split("[")[0] == matchnames[0]
):
submatchnodes.append(r)
if submatchnodes:
work.append((submatchnodes, matchnames[1:]))
else:
# Report collection failures here to avoid failing to run some test
# specified in the command line because the module could not be
# imported (#134).
node.ihook.pytest_collectreport(report=rep)
self.trace("matchnodes finished -> ", len(matching), "nodes")
self.trace.root.indent -= 1
if not matching:
report_arg = "::".join((str(argpath), *names))
self._notfound.append((report_arg, col))
continue
# If __init__.py was the only file requested, then the matched
# node will be the corresponding Package (by default), and the
# first yielded item will be the __init__ Module itself, so
# just use that. If this special case isn't taken, then all the
# files in the package will be yielded.
if argpath.name == "__init__.py" and isinstance(matching[0], Package):
try:
yield next(iter(matching[0].collect()))
except StopIteration:
# The package collects nothing with only an __init__.py
# file in it, which gets ignored by the default
# "python_files" option.
pass
continue
yield from matching
self.trace.root.indent -= 1
def genitems(
self, node: Union[nodes.Item, nodes.Collector]
) -> Iterator[nodes.Item]:
self.trace("genitems", node)
if isinstance(node, nodes.Item):
node.ihook.pytest_itemcollected(item=node)
yield node
else:
assert isinstance(node, nodes.Collector)
rep = collect_one_node(node)
if rep.passed:
for subnode in rep.result:
yield from self.genitems(subnode)
node.ihook.pytest_collectreport(report=rep)
def search_pypath(module_name: str) -> str:
"""Search sys.path for the given a dotted module name, and return its file system path."""
try:
spec = importlib.util.find_spec(module_name)
# AttributeError: looks like package module, but actually filename
# ImportError: module does not exist
# ValueError: not a module name
except (AttributeError, ImportError, ValueError):
return module_name
if spec is None or spec.origin is None or spec.origin == "namespace":
return module_name
elif spec.submodule_search_locations:
return os.path.dirname(spec.origin)
else:
return spec.origin
def resolve_collection_argument(
invocation_path: Path, arg: str, *, as_pypath: bool = False
) -> Tuple[Path, List[str]]:
"""Parse path arguments optionally containing selection parts and return (fspath, names).
Command-line arguments can point to files and/or directories, and optionally contain
parts for specific tests selection, for example:
"pkg/tests/test_foo.py::TestClass::test_foo"
This function ensures the path exists, and returns a tuple:
(Path("/full/path/to/pkg/tests/test_foo.py"), ["TestClass", "test_foo"])
When as_pypath is True, expects that the command-line argument actually contains
module paths instead of file-system paths:
"pkg.tests.test_foo::TestClass::test_foo"
In which case we search sys.path for a matching module, and then return the *path* to the
found module.
If the path doesn't exist, raise UsageError.
If the path is a directory and selection parts are present, raise UsageError.
"""
base, squacket, rest = str(arg).partition("[")
strpath, *parts = base.split("::")
if parts:
parts[-1] = f"{parts[-1]}{squacket}{rest}"
if as_pypath:
strpath = search_pypath(strpath)
fspath = invocation_path / strpath
fspath = absolutepath(fspath)
if not fspath.exists():
msg = (
"module or package not found: {arg} (missing __init__.py?)"
if as_pypath
else "file or directory not found: {arg}"
)
raise UsageError(msg.format(arg=arg))
if parts and fspath.is_dir():
msg = (
"package argument cannot contain :: selection parts: {arg}"
if as_pypath
else "directory argument cannot contain :: selection parts: {arg}"
)
raise UsageError(msg.format(arg=arg))
return fspath, parts
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