Properly handle returning :c:data:`Py_NotImplemented` from within a C
function (that is, create a new :term:`strong reference`
- to NotImplemented and return it).
+ to :const:`NotImplemented` and return it).
.. c:macro:: Py_PRINT_RAW
time can acquire a lock --- that's their reason for existence).
If the *blocking* argument is present, the action depends on its
- value: if it is False, the lock is only acquired if it can be acquired
- immediately without waiting, while if it is True, the lock is acquired
+ value: if it is false, the lock is only acquired if it can be acquired
+ immediately without waiting, while if it is true, the lock is acquired
unconditionally as above.
If the floating-point *timeout* argument is present and positive, it
specifies the maximum wait time in seconds before returning. A negative
*timeout* argument specifies an unbounded wait. You cannot specify
- a *timeout* if *blocking* is False.
+ a *timeout* if *blocking* is false.
The return value is ``True`` if the lock is acquired successfully,
``False`` if not.
# [2, 6, 24]
.. note::
- If *return_exceptions* is False, cancelling gather() after it
+ If *return_exceptions* is false, cancelling gather() after it
has been marked done won't cancel any submitted awaitables.
For instance, gather can be marked done after propagating an
exception to the caller, therefore, calling ``gather.cancel()``
.. attribute:: temporary
- True if a :class:`Breakpoint` at (file, line) is temporary.
+ ``True`` if a :class:`Breakpoint` at (file, line) is temporary.
.. attribute:: cond
.. attribute:: enabled
- True if :class:`Breakpoint` is enabled.
+ ``True`` if :class:`Breakpoint` is enabled.
.. attribute:: bpbynumber
.. method:: is_skipped_line(module_name)
- Return True if *module_name* matches any skip pattern.
+ Return ``True`` if *module_name* matches any skip pattern.
.. method:: stop_here(frame)
- Return True if *frame* is below the starting frame in the stack.
+ Return ``True`` if *frame* is below the starting frame in the stack.
.. method:: break_here(frame)
- Return True if there is an effective breakpoint for this line.
+ Return ``True`` if there is an effective breakpoint for this line.
Check whether a line or function breakpoint exists and is in effect. Delete temporary
breakpoints based on information from :func:`effective`.
.. method:: break_anywhere(frame)
- Return True if any breakpoint exists for *frame*'s filename.
+ Return ``True`` if any breakpoint exists for *frame*'s filename.
Derived classes should override these methods to gain control over debugger
operation.
.. method:: get_break(filename, lineno)
- Return True if there is a breakpoint for *lineno* in *filename*.
+ Return ``True`` if there is a breakpoint for *lineno* in *filename*.
.. method:: get_breaks(filename, lineno)
.. function:: checkfuncname(b, frame)
- Return True if we should break here, depending on the way the
+ Return ``True`` if we should break here, depending on the way the
:class:`Breakpoint` *b* was set.
If it was set via line number, it checks if
:attr:`bplist <bdb.Breakpoint.bplist>` for the
(:attr:`file <bdb.Breakpoint.file>`, :attr:`line <bdb.Breakpoint.line>`)
(which must exist) that is :attr:`enabled <bdb.Breakpoint.enabled>`, for
- which :func:`checkfuncname` is True, and that has neither a False
+ which :func:`checkfuncname` is true, and that has neither a false
:attr:`condition <bdb.Breakpoint.cond>` nor positive
:attr:`ignore <bdb.Breakpoint.ignore>` count. The *flag*, meaning that a
- temporary breakpoint should be deleted, is False only when the
+ temporary breakpoint should be deleted, is ``False`` only when the
:attr:`cond <bdb.Breakpoint.cond>` cannot be evaluated (in which case,
:attr:`ignore <bdb.Breakpoint.ignore>` count is ignored).
- If no such entry exists, then (None, None) is returned.
+ If no such entry exists, then ``(None, None)`` is returned.
.. function:: set_trace()
The *invalidation_mode* parameter was added.
.. versionchanged:: 3.7.2
- The *invalidation_mode* parameter's default value is updated to None.
+ The *invalidation_mode* parameter's default value is updated to ``None``.
.. versionchanged:: 3.8
Setting *workers* to 0 now chooses the optimal number of cores.
The *invalidation_mode* parameter was added.
.. versionchanged:: 3.7.2
- The *invalidation_mode* parameter's default value is updated to None.
+ The *invalidation_mode* parameter's default value is updated to ``None``.
.. versionchanged:: 3.9
Added *stripdir*, *prependdir*, *limit_sl_dest* and *hardlink_dupes* arguments.
The *invalidation_mode* parameter was added.
.. versionchanged:: 3.7.2
- The *invalidation_mode* parameter's default value is updated to None.
+ The *invalidation_mode* parameter's default value is updated to ``None``.
To force a recompile of all the :file:`.py` files in the :file:`Lib/`
subdirectory and all its subdirectories::
``None``. This is similar to :data:`QUOTE_ALL`, except that if a
field value is ``None`` an empty (unquoted) string is written.
- Instructs :class:`reader` objects to interpret an empty (unquoted) field as None and
- to otherwise behave as :data:`QUOTE_ALL`.
+ Instructs :class:`reader` objects to interpret an empty (unquoted) field
+ as ``None`` and to otherwise behave as :data:`QUOTE_ALL`.
.. versionadded:: 3.12
generated equality and comparison methods (:meth:`~object.__eq__`,
:meth:`~object.__gt__`, et al.).
- - *metadata*: This can be a mapping or None. None is treated as
+ - *metadata*: This can be a mapping or ``None``. ``None`` is treated as
an empty dict. This value is wrapped in
:func:`~types.MappingProxyType` to make it read-only, and exposed
on the :class:`Field` object. It is not used at all by Data
.. versionadded:: 3.2
.. versionchanged:: 3.4
- Returning NotImplemented from the underlying comparison function for
+ Returning ``NotImplemented`` from the underlying comparison function for
unrecognised types is now supported.
.. function:: partial(func, /, *args, **keywords)
.. function:: get_objects(generation=None)
Returns a list of all objects tracked by the collector, excluding the list
- returned. If *generation* is not None, return only the objects tracked by
+ returned. If *generation* is not ``None``, return only the objects tracked by
the collector that are in that generation.
.. versionchanged:: 3.8
initialized. If *host* is not specified, ``''`` (the local host) is used. If
*port* is omitted, the standard IMAP4 port (143) is used. The optional *timeout*
parameter specifies a timeout in seconds for the connection attempt.
- If timeout is not given or is None, the global default socket timeout is used.
+ If timeout is not given or is ``None``, the global default socket timeout is used.
The :class:`IMAP4` class supports the :keyword:`with` statement. When used
like this, the IMAP4 ``LOGOUT`` command is issued automatically when the
best practices.
The optional *timeout* parameter specifies a timeout in seconds for the
- connection attempt. If timeout is not given or is None, the global default
+ connection attempt. If timeout is not given or is ``None``, the global default
socket timeout is used.
.. versionchanged:: 3.3
Opens socket to *port* at *host*. The optional *timeout* parameter
specifies a timeout in seconds for the connection attempt.
- If timeout is not given or is None, the global default socket timeout
+ If timeout is not given or is ``None``, the global default socket timeout
is used. Also note that if the *timeout* parameter is set to be zero,
it will raise a :class:`ValueError` to reject creating a non-blocking socket.
This method is implicitly called by the :class:`IMAP4` constructor.
.. abstractmethod:: is_dir()
- Return True if self is a directory.
+ Return ``True`` if self is a directory.
.. abstractmethod:: is_file()
- Return True if self is a file.
+ Return ``True`` if self is a file.
.. abstractmethod:: joinpath(*pathsegments)
:param stream: The stream that the handler should use.
- :return: the old stream, if the stream was changed, or *None* if it wasn't.
+ :return: the old stream, if the stream was changed, or ``None`` if it wasn't.
.. versionadded:: 3.7
Evaluates to ``n! / (n - k)!`` when ``k <= n`` and evaluates
to zero when ``k > n``.
- If *k* is not specified or is None, then *k* defaults to *n*
+ If *k* is not specified or is ``None``, then *k* defaults to *n*
and the function returns ``n!``.
Raises :exc:`TypeError` if either of the arguments are not integers.
generally be omitted since it can usually be inferred from the format of
*address*. (See :ref:`multiprocessing-address-formats`)
- If *authkey* is given and not None, it should be a byte string and will be
+ If *authkey* is given and not ``None``, it should be a byte string and will be
used as the secret key for an HMAC-based authentication challenge. No
- authentication is done if *authkey* is None.
+ authentication is done if *authkey* is ``None``.
:exc:`~multiprocessing.AuthenticationError` is raised if authentication fails.
See :ref:`multiprocessing-auth-keys`.
to the :meth:`~socket.socket.listen` method of the socket once it has been
bound.
- If *authkey* is given and not None, it should be a byte string and will be
+ If *authkey* is given and not ``None``, it should be a byte string and will be
used as the secret key for an HMAC-based authentication challenge. No
- authentication is done if *authkey* is None.
+ authentication is done if *authkey* is ``None``.
:exc:`~multiprocessing.AuthenticationError` is raised if authentication fails.
See :ref:`multiprocessing-auth-keys`.
Copy *count* bytes from file descriptor *src*, starting from offset
*offset_src*, to file descriptor *dst*, starting from offset *offset_dst*.
- If *offset_src* is None, then *src* is read from the current position;
+ If *offset_src* is ``None``, then *src* is read from the current position;
respectively for *offset_dst*.
In Linux kernel older than 5.3, the files pointed to by *src* and *dst*
Transfer *count* bytes from file descriptor *src*, starting from offset
*offset_src*, to file descriptor *dst*, starting from offset *offset_dst*.
At least one of the file descriptors must refer to a pipe. If *offset_src*
- is None, then *src* is read from the current position; respectively for
+ is ``None``, then *src* is read from the current position; respectively for
*offset_dst*. The offset associated to the file descriptor that refers to a
pipe must be ``None``. The files pointed to by *src* and *dst* must reside in
the same filesystem, otherwise an :exc:`OSError` is raised with
raise ValueError(error_message.format(str(self), str(formatted)))
ValueError: '/etc/passwd' is not in the subpath of '/usr' OR one path is relative and the other is absolute.
- When *walk_up* is False (the default), the path must start with *other*.
- When the argument is True, ``..`` entries may be added to form the
+ When *walk_up* is false (the default), the path must start with *other*.
+ When the argument is true, ``..`` entries may be added to form the
relative path. In all other cases, such as the paths referencing
different drives, :exc:`ValueError` is raised.::
map the new Python 3 names to the old module names used in Python 2, so
that the pickle data stream is readable with Python 2.
- If *buffer_callback* is None (the default), buffer views are
+ If *buffer_callback* is ``None`` (the default), buffer views are
serialized into *file* as part of the pickle stream.
- If *buffer_callback* is not None, then it can be called any number
+ If *buffer_callback* is not ``None``, then it can be called any number
of times with a buffer view. If the callback returns a false value
- (such as
None), the given buffer is :ref:`out-of-band <pickle-oob>`;
+ (such as
``None``), the given buffer is :ref:`out-of-band <pickle-oob>`;
otherwise the buffer is serialized in-band, i.e. inside the pickle stream.
- It is an error if *buffer_callback* is not None and *protocol* is
- None or smaller than 5.
+ It is an error if *buffer_callback* is not ``None`` and *protocol* is
+ ``None`` or smaller than 5.
.. versionchanged:: 3.8
The *buffer_callback* argument was added.
instances of :class:`~datetime.datetime`, :class:`~datetime.date` and
:class:`~datetime.time` pickled by Python 2.
- If *buffers* is None (the default), then all data necessary for
+ If *buffers* is ``None`` (the default), then all data necessary for
deserialization must be contained in the pickle stream. This means
- that the *buffer_callback* argument was None when a :class:`Pickler`
+ that the *buffer_callback* argument was ``None`` when a :class:`Pickler`
was instantiated (or when :func:`dump` or :func:`dumps` was called).
- If *buffers* is not None, it should be an iterable of buffer-enabled
+ If *buffers* is not ``None``, it should be an iterable of buffer-enabled
objects that is consumed each time the pickle stream references
an :ref:`out-of-band <pickle-oob>` buffer view. Such buffers have been
given in order to the *buffer_callback* of a Pickler object.
.. attribute:: parent
- For top-level classes, None. For nested classes, the parent.
+ For top-level classes, ``None``. For nested classes, the parent.
.. versionadded:: 3.7
.. function:: harmonic_mean(data, weights=None)
Return the harmonic mean of *data*, a sequence or iterable of
- real-valued numbers. If *weights* is omitted or *None*, then
+ real-valued numbers. If *weights* is omitted or ``None``, then
equal weighting is assumed.
The harmonic mean is the reciprocal of the arithmetic :func:`mean` of the
contain a tuple of (filename, line number, function name) tuples
describing the traceback where the coroutine object was created,
with the most recent call first. When disabled, ``cr_origin`` will
- be None.
+ be ``None``.
To enable, pass a *depth* value greater than zero; this sets the
number of frames whose information will be captured. To disable,
.. data:: Py_DEBUG
- True if Python was built with the :c:macro:`Py_DEBUG` macro
+ ``True`` if Python was built with the :c:macro:`Py_DEBUG` macro
defined, that is, if
Python was :ref:`built in debug mode <debug-build>`.
#. Top-down search of area under mouse for target widget
* Target widget should have a callable *dnd_accept* attribute
- * If *dnd_accept* is not present or returns None, search moves to parent widget
- * If no target widget is found, then the target object is None
+ * If *dnd_accept* is not present or returns ``None``, search moves to parent widget
+ * If no target widget is found, then the target object is ``None``
2. Call to *<old_target>.dnd_leave(source, event)*
#. Call to *<new_target>.dnd_enter(source, event)*
is saved before setting *fd* to raw mode; this value is returned.
.. versionchanged:: 3.12
- The return value is now the original tty attributes, instead of None.
+ The return value is now the original tty attributes, instead of ``None``.
.. function:: setcbreak(fd, when=termios.TCSAFLUSH)
the minimum input to 1 byte with no delay.
.. versionchanged:: 3.12
- The return value is now the original tty attributes, instead of None.
+ The return value is now the original tty attributes, instead of ``None``.
.. versionchanged:: 3.12.2
The ``ICRNL`` flag is no longer cleared. This restores the behavior
This attribute reflects *only* the value of the ``total`` argument
to the current ``TypedDict`` class, not whether the class is semantically
- total. For example, a ``TypedDict`` with ``__total__`` set to True may
+ total. For example, a ``TypedDict`` with ``__total__`` set to ``True`` may
have keys marked with :data:`NotRequired`, or it may inherit from another
``TypedDict`` with ``total=False``. Therefore, it is generally better to use
:attr:`__required_keys__` and :attr:`__optional_keys__` for introspection.
An appropriate ``Content-Type`` header should be included if the *data*
argument is present. If this header has not been provided and *data*
- is not None, ``Content-Type: application/x-www-form-urlencoded`` will
+ is not ``None``, ``Content-Type: application/x-www-form-urlencoded`` will
be added as a default.
The next two arguments are only of interest for correct handling
Another thing you might notice is that not all data can be sorted or
compared. For instance, ``[None, 'hello', 10]`` doesn't sort because
-integers can't be compared to strings and *None* can't be compared to
+integers can't be compared to strings and ``None`` can't be compared to
other types. Also, there are some types that don't have a defined
ordering relation. For example, ``3+4j < 5+7j`` isn't a valid
comparison.
.. section: Library
argparse actions store_const and append_const each receive a default value
-of None when the ``const`` kwarg is not provided. Previously, this raised a
+of ``None`` when the ``const`` kwarg is not provided. Previously, this raised a
:exc:`TypeError`.
..
.. section: Documentation
Document that :class:`collections.defaultdict` parameter ``default_factory``
-defaults to None and is positional-only.
+defaults to ``None`` and is positional-only.
..
.. nonce: 4MQt4r
.. section: Library
-pprint.pprint() now handles underscore_numbers correctly. Previously it was
-always setting it to False.
+:func:`pprint.pprint` now handles *underscore_numbers* correctly.
+Previously it was always setting it to ``False``.
..
.. nonce: -igcjS
.. section: Core and Builtins
-Add a closure keyword-only parameter to exec(). It can only be specified
+Add a closure keyword-only parameter to :func:`exec()`. It can only be specified
when exec-ing a code object that uses free variables. When specified, it
must be a tuple, with exactly the number of cell variables referenced by the
-code object. closure has a default value of None, and it must be None if the
+code object. closure has a default value of ``None``, and it must be ``None`` if the
code object doesn't refer to any free variables.
..
.. nonce: l1p7CJ
.. section: Library
-For @dataclass, add weakref_slot. Default is False. If True, and if
-slots=True, add a slot named "__weakref__", which will allow instances to be
+For :func:`@dataclass <dataclasses.dataclass>`, add *weakref_slot*.
+The new parameter defaults to ``False``. If true, and if
+``slots=True``, add a slot named ``"__weakref__"``, which will allow instances to be
weakref'd. Contributed by Eric V. Smith
..
.. nonce: mkYl5q
.. section: Library
-Implement Enum __contains__ that returns True or False to replace the
-deprecated behaviour that would sometimes raise a TypeError.
+Implement ``Enum.__contains__`` that returns ``True`` or ``False`` to replace the
+deprecated behaviour that would sometimes raise a :exc:`TypeError`.
..
.. nonce: e6uKxj
.. section: Library
-Fix :func:`ast.unparse` when ``ImportFrom.level`` is None
+Fix :func:`ast.unparse` when ``ImportFrom.level`` is ``None``
..
.. section: Library
Fixed crash resulting from calling bisect.insort() or bisect.insort_left()
-with the key argument not equal to None.
+with the key argument not equal to ``None``.
..
.. section: Library
Fix findtext in the xml module to only give an empty string when the text
-attribute is set to None.
+attribute is set to ``None``.
..
Fix :attr:`~ipaddress.IPv4Address.is_private` properties in the
:mod:`ipaddress` module. Previously non-private networks (0.0.0.0/0) would
-return True from this method; now they correctly return False.
+return ``True`` from this method; now they correctly return ``False``.
..
.. nonce: M2n6Kg
.. section: Core and Builtins
-Fix :func:`int.__sizeof__` calculation to include the 1 element ob_digit
-array for 0 and False.
+Fix :func:`int.__sizeof__` calculation to include the 1-element ``ob_digit``
+array for ``0`` and ``False``.
..
.. section: Core and Builtins
Clarify :exc:`SyntaxWarning` with literal ``is`` comparison by specifying
-which literal is problematic, since comparisons using ``is`` with e.g. None
+which literal is problematic, since comparisons using ``is`` with e.g. ``None``
and bool literals are idiomatic.
..
projects / thirdparty / Python / cpython.git / commitdiff
