ꦫꦣꦺꦤ꧀ꦄꦤ꧀ꦠꦱꦺꦤ

PATH: usr / lib64 / python3.6

"""Utilities for with-statement contexts.  See PEP 343."""
import abc
import sys
import _collections_abc
from collections import deque
from functools import wraps

__all__ = ["contextmanager", "closing", "AbstractContextManager",
           "ContextDecorator", "ExitStack", "redirect_stdout",
           "redirect_stderr", "suppress"]

class AbstractContextManager(abc.ABC):

"""An abstract base class for context managers."""

def __enter__(self):
        """Return `self` upon entering the runtime context."""
        return self

@abc.abstractmethod
    def __exit__(self, exc_type, exc_value, traceback):
        """Raise any exception triggered within the runtime context."""
        return None

@classmethod
    def __subclasshook__(cls, C):
        if cls is AbstractContextManager:
            return _collections_abc._check_methods(C, "__enter__", "__exit__")
        return NotImplemented

class ContextDecorator(object):
    "A base class or mixin that enables context managers to work as decorators."

def _recreate_cm(self):
        """Return a recreated instance of self.

Allows an otherwise one-shot context manager like
        _GeneratorContextManager to support use as
        a decorator via implicit recreation.

This is a private interface just for _GeneratorContextManager.
        See issue #11647 for details.
        """
        return self

def __call__(self, func):
        @wraps(func)
        def inner(*args, **kwds):
            with self._recreate_cm():
                return func(*args, **kwds)
        return inner

class _GeneratorContextManager(ContextDecorator, AbstractContextManager):
    """Helper for @contextmanager decorator."""

def __init__(self, func, args, kwds):
        self.gen = func(*args, **kwds)
        self.func, self.args, self.kwds = func, args, kwds
        # Issue 19330: ensure context manager instances have good docstrings
        doc = getattr(func, "__doc__", None)
        if doc is None:
            doc = type(self).__doc__
        self.__doc__ = doc
        # Unfortunately, this still doesn't provide good help output when
        # inspecting the created context manager instances, since pydoc
        # currently bypasses the instance docstring and shows the docstring
        # for the class instead.
        # See http://bugs.python.org/issue19404 for more details.

def _recreate_cm(self):
        # _GCM instances are one-shot context managers, so the
        # CM must be recreated each time a decorated function is
        # called
        return self.__class__(self.func, self.args, self.kwds)

def __enter__(self):
        try:
            return next(self.gen)
        except StopIteration:
            raise RuntimeError("generator didn't yield") from None

def __exit__(self, type, value, traceback):
        if type is None:
            try:
                next(self.gen)
            except StopIteration:
                return False
            else:
                raise RuntimeError("generator didn't stop")
        else:
            if value is None:
                # Need to force instantiation so we can reliably
                # tell if we get the same exception back
                value = type()
            try:
                self.gen.throw(type, value, traceback)
            except StopIteration as exc:
                # Suppress StopIteration *unless* it's the same exception that
                # was passed to throw().  This prevents a StopIteration
                # raised inside the "with" statement from being suppressed.
                return exc is not value
            except RuntimeError as exc:
                # Don't re-raise the passed in exception. (issue27122)
                if exc is value:
                    return False
                # Likewise, avoid suppressing if a StopIteration exception
                # was passed to throw() and later wrapped into a RuntimeError
                # (see PEP 479).
                if type is StopIteration and exc.__cause__ is value:
                    return False
                raise
            except:
                # only re-raise if it's *not* the exception that was
                # passed to throw(), because __exit__() must not raise
                # an exception unless __exit__() itself failed.  But throw()
                # has to raise the exception to signal propagation, so this
                # fixes the impedance mismatch between the throw() protocol
                # and the __exit__() protocol.
                #
                if sys.exc_info()[1] is value:
                    return False
                raise
            raise RuntimeError("generator didn't stop after throw()")

def contextmanager(func):
    """@contextmanager decorator.

Typical usage:

@contextmanager
        def some_generator(<arguments>):
            <setup>
            try:
                yield <value>
            finally:
                <cleanup>

This makes this:

with some_generator(<arguments>) as <variable>:
            <body>

equivalent to this:

<setup>
        try:
            <variable> = <value>
            <body>
        finally:
            <cleanup>

"""
    @wraps(func)
    def helper(*args, **kwds):
        return _GeneratorContextManager(func, args, kwds)
    return helper

class closing(AbstractContextManager):
    """Context to automatically close something at the end of a block.

Code like this:

with closing(<module>.open(<arguments>)) as f:
            <block>

is equivalent to this:

f = <module>.open(<arguments>)
        try:
            <block>
        finally:
            f.close()

"""
    def __init__(self, thing):
        self.thing = thing
    def __enter__(self):
        return self.thing
    def __exit__(self, *exc_info):
        self.thing.close()

class _RedirectStream(AbstractContextManager):

_stream = None

def __init__(self, new_target):
        self._new_target = new_target
        # We use a list of old targets to make this CM re-entrant
        self._old_targets = []

def __enter__(self):
        self._old_targets.append(getattr(sys, self._stream))
        setattr(sys, self._stream, self._new_target)
        return self._new_target

def __exit__(self, exctype, excinst, exctb):
        setattr(sys, self._stream, self._old_targets.pop())

class redirect_stdout(_RedirectStream):
    """Context manager for temporarily redirecting stdout to another file.

# How to send help() to stderr
        with redirect_stdout(sys.stderr):
            help(dir)

# How to write help() to a file
        with open('help.txt', 'w') as f:
            with redirect_stdout(f):
                help(pow)
    """

_stream = "stdout"

class redirect_stderr(_RedirectStream):
    """Context manager for temporarily redirecting stderr to another file."""

_stream = "stderr"

class suppress(AbstractContextManager):
    """Context manager to suppress specified exceptions

After the exception is suppressed, execution proceeds with the next
    statement following the with statement.

with suppress(FileNotFoundError):
             os.remove(somefile)
         # Execution still resumes here if the file was already removed
    """

def __init__(self, *exceptions):
        self._exceptions = exceptions

def __enter__(self):
        pass

def __exit__(self, exctype, excinst, exctb):
        # Unlike isinstance and issubclass, CPython exception handling
        # currently only looks at the concrete type hierarchy (ignoring
        # the instance and subclass checking hooks). While Guido considers
        # that a bug rather than a feature, it's a fairly hard one to fix
        # due to various internal implementation details. suppress provides
        # the simpler issubclass based semantics, rather than trying to
        # exactly reproduce the limitations of the CPython interpreter.
        #
        # See http://bugs.python.org/issue12029 for more details
        return exctype is not None and issubclass(exctype, self._exceptions)

# Inspired by discussions on http://bugs.python.org/issue13585
class ExitStack(AbstractContextManager):
    """Context manager for dynamic management of a stack of exit callbacks

For example:

with ExitStack() as stack:
            files = [stack.enter_context(open(fname)) for fname in filenames]
            # All opened files will automatically be closed at the end of
            # the with statement, even if attempts to open files later
            # in the list raise an exception

"""
    def __init__(self):
        self._exit_callbacks = deque()

def pop_all(self):
        """Preserve the context stack by transferring it to a new instance"""
        new_stack = type(self)()
        new_stack._exit_callbacks = self._exit_callbacks
        self._exit_callbacks = deque()
        return new_stack

def _push_cm_exit(self, cm, cm_exit):
        """Helper to correctly register callbacks to __exit__ methods"""
        def _exit_wrapper(*exc_details):
            return cm_exit(cm, *exc_details)
        _exit_wrapper.__self__ = cm
        self.push(_exit_wrapper)

def push(self, exit):
        """Registers a callback with the standard __exit__ method signature

Can suppress exceptions the same way __exit__ methods can.

Also accepts any object with an __exit__ method (registering a call
        to the method instead of the object itself)
        """
        # We use an unbound method rather than a bound method to follow
        # the standard lookup behaviour for special methods
        _cb_type = type(exit)
        try:
            exit_method = _cb_type.__exit__
        except AttributeError:
            # Not a context manager, so assume its a callable
            self._exit_callbacks.append(exit)
        else:
            self._push_cm_exit(exit, exit_method)
        return exit # Allow use as a decorator

def callback(self, callback, *args, **kwds):
        """Registers an arbitrary callback and arguments.

Cannot suppress exceptions.
        """
        def _exit_wrapper(exc_type, exc, tb):
            callback(*args, **kwds)
        # We changed the signature, so using @wraps is not appropriate, but
        # setting __wrapped__ may still help with introspection
        _exit_wrapper.__wrapped__ = callback
        self.push(_exit_wrapper)
        return callback # Allow use as a decorator

def enter_context(self, cm):
        """Enters the supplied context manager

If successful, also pushes its __exit__ method as a callback and
        returns the result of the __enter__ method.
        """
        # We look up the special methods on the type to match the with statement
        _cm_type = type(cm)
        _exit = _cm_type.__exit__
        result = _cm_type.__enter__(cm)
        self._push_cm_exit(cm, _exit)
        return result

def close(self):
        """Immediately unwind the context stack"""
        self.__exit__(None, None, None)

def __exit__(self, *exc_details):
        received_exc = exc_details[0] is not None

# We manipulate the exception state so it behaves as though
        # we were actually nesting multiple with statements
        frame_exc = sys.exc_info()[1]
        def _fix_exception_context(new_exc, old_exc):
            # Context may not be correct, so find the end of the chain
            while 1:
                exc_context = new_exc.__context__
                if exc_context is old_exc:
                    # Context is already set correctly (see issue 20317)
                    return
                if exc_context is None or exc_context is frame_exc:
                    break
                new_exc = exc_context
            # Change the end of the chain to point to the exception
            # we expect it to reference
            new_exc.__context__ = old_exc

# Callbacks are invoked in LIFO order to match the behaviour of
        # nested context managers
        suppressed_exc = False
        pending_raise = False
        while self._exit_callbacks:
            cb = self._exit_callbacks.pop()
            try:
                if cb(*exc_details):
                    suppressed_exc = True
                    pending_raise = False
                    exc_details = (None, None, None)
            except:
                new_exc_details = sys.exc_info()
                # simulate the stack of exceptions by setting the context
                _fix_exception_context(new_exc_details[1], exc_details[1])
                pending_raise = True
                exc_details = new_exc_details
        if pending_raise:
            try:
                # bare "raise exc_details[1]" replaces our carefully
                # set-up context
                fixed_ctx = exc_details[1].__context__
                raise exc_details[1]
            except BaseException:
                exc_details[1].__context__ = fixed_ctx
                raise
        return received_exc and suppressed_exc

[+] ..
[-] __phello__.foo.py [edit]
[-] zipfile.py [edit]
[-] _dummy_thread.py [edit]
[-] signal.py [edit]
[-] tabnanny.py [edit]
[-] cmd.py [edit]
[-] cProfile.py [edit]
[-] tempfile.py [edit]
[-] argparse.py [edit]
[-] platform.py [edit]
[-] binhex.py [edit]
[-] antigravity.py [edit]
[+] curses
[-] _compat_pickle.py [edit]
[-] statistics.py [edit]
[-] inspect.py [edit]
[-] ipaddress.py [edit]
[-] sunau.py [edit]
[-] imghdr.py [edit]
[-] random.py [edit]
[-] macpath.py [edit]
[-] hmac.py [edit]
[-] base64.py [edit]
[-] cgitb.py [edit]
[-] stringprep.py [edit]
[-] ast.py [edit]
[-] textwrap.py [edit]
[-] enum.py [edit]
[-] _compression.py [edit]
[-] dis.py [edit]
[+] venv
[-] chunk.py [edit]
[-] this.py [edit]
[-] py_compile.py [edit]
[-] fnmatch.py [edit]
[+] xml
[-] opcode.py [edit]
[+] site-packages
[-] sre_compile.py [edit]
[-] _pyio.py [edit]
[-] pty.py [edit]
[-] datetime.py [edit]
[-] macurl2path.py [edit]
[+] lib2to3
[+] wsgiref
[-] heapq.py [edit]
[-] keyword.py [edit]
[-] codecs.py [edit]
[+] ensurepip
[-] pickletools.py [edit]
[-] compileall.py [edit]
[-] nturl2path.py [edit]
[-] warnings.py [edit]
[-] shutil.py [edit]
[-] socket.py [edit]
[-] pdb.py [edit]
[-] zipapp.py [edit]
[-] formatter.py [edit]
[-] _sitebuiltins.py [edit]
[-] _markupbase.py [edit]
[-] types.py [edit]
[-] runpy.py [edit]
[-] uu.py [edit]
[-] typing.py [edit]
[-] pathlib.py [edit]
[-] _threading_local.py [edit]
[-] mailcap.py [edit]
[-] bisect.py [edit]
[-] linecache.py [edit]
[-] colorsys.py [edit]
[-] glob.py [edit]
[-] sndhdr.py [edit]
[-] ssl.py [edit]
[-] _strptime.py [edit]
[-] _sysconfigdata_m_linux_x86_64-linux-gnu.py [edit]
[-] imp.py [edit]
[-] contextlib.py [edit]
[-] copyreg.py [edit]
[-] filecmp.py [edit]
[+] logging
[-] operator.py [edit]
[-] token.py [edit]
[-] gzip.py [edit]
[-] string.py [edit]
[-] genericpath.py [edit]
[-] _osx_support.py [edit]
[-] stat.py [edit]
[-] lzma.py [edit]
[-] __future__.py [edit]
[+] distutils
[-] dummy_threading.py [edit]
[+] asyncio
[-] webbrowser.py [edit]
[-] symtable.py [edit]
[+] lib-dynload
[-] getopt.py [edit]
[-] wave.py [edit]
[-] codeop.py [edit]
[-] _sysconfigdata_dm_linux_x86_64-linux-gnu.py [edit]
[-] abc.py [edit]
[+] config-3.6m-x86_64-linux-gnu
[+] pydoc_data
[-] telnetlib.py [edit]
[+] unittest
[-] fileinput.py [edit]
[-] ftplib.py [edit]
[+] ctypes
[-] _bootlocale.py [edit]
[-] pipes.py [edit]
[-] aifc.py [edit]
[-] pprint.py [edit]
[-] queue.py [edit]
[-] difflib.py [edit]
[+] __pycache__
[-] uuid.py [edit]
[-] reprlib.py [edit]
[-] threading.py [edit]
[+] http
[-] sre_parse.py [edit]
[-] subprocess.py [edit]
[+] importlib
[-] selectors.py [edit]
[-] getpass.py [edit]
[-] trace.py [edit]
[-] struct.py [edit]
[-] tracemalloc.py [edit]
[-] plistlib.py [edit]
[-] asynchat.py [edit]
[-] fractions.py [edit]
[-] shlex.py [edit]
[-] bdb.py [edit]
[-] locale.py [edit]
[-] calendar.py [edit]
[-] poplib.py [edit]
[-] posixpath.py [edit]
[-] imaplib.py [edit]
[+] concurrent
[-] pickle.py [edit]
[-] timeit.py [edit]
[+] json
[-] traceback.py [edit]
[+] multiprocessing
[-] shelve.py [edit]
[-] csv.py [edit]
[-] tarfile.py [edit]
[-] numbers.py [edit]
[-] optparse.py [edit]
[-] cgi.py [edit]
[-] pstats.py [edit]
[-] crypt.py [edit]
[+] collections
[-] site.py [edit]
[-] pkgutil.py [edit]
[-] re.py [edit]
[-] pyclbr.py [edit]
[-] socketserver.py [edit]
[-] _pydecimal.py [edit]
[-] pydoc.py [edit]
[-] sre_constants.py [edit]
[-] xdrlib.py [edit]
[-] nntplib.py [edit]
[-] mimetypes.py [edit]
[+] email
[-] quopri.py [edit]
[-] doctest.py [edit]
[-] profile.py [edit]
[-] sched.py [edit]
[-] hashlib.py [edit]
[+] urllib
[-] secrets.py [edit]
[-] functools.py [edit]
[-] smtplib.py [edit]
[-] copy.py [edit]
[+] dbm
[-] tty.py [edit]
[-] os.py [edit]
[-] _collections_abc.py [edit]
[-] configparser.py [edit]
[-] _weakrefset.py [edit]
[-] netrc.py [edit]
[-] code.py [edit]
[-] asyncore.py [edit]
[-] tokenize.py [edit]
[+] encodings
[-] io.py [edit]
[-] smtpd.py [edit]
[-] sysconfig.py [edit]
[-] decimal.py [edit]
[+] sqlite3
[-] rlcompleter.py [edit]
[-] ntpath.py [edit]
[+] test
[-] weakref.py [edit]
[-] symbol.py [edit]
[-] modulefinder.py [edit]
[+] xmlrpc
[-] bz2.py [edit]
[-] gettext.py [edit]
[-] mailbox.py [edit]
[+] html