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‎_sources/faq/programming.rst.txt

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@@ -113,6 +113,8 @@ Yes. The coding style required for standard library modules is documented as
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Core Language
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=============
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.. _faq-unboundlocalerror:
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Why am I getting an UnboundLocalError when the variable has a value?
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--------------------------------------------------------------------
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‎_sources/library/contextvars.rst.txt

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To get a copy of the current context use the
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:func:`~contextvars.copy_context` function.
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Every thread will have a different top-level :class:`~contextvars.Context`
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object. This means that a :class:`ContextVar` object behaves in a similar
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fashion to :func:`threading.local()` when values are assigned in different
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threads.
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Context implements the :class:`collections.abc.Mapping` interface.
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.. method:: run(callable, *args, **kwargs)

‎_sources/library/re.rst.txt

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@@ -589,10 +589,9 @@ character ``'$'``.
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``\w``
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For Unicode (str) patterns:
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Matches Unicode word characters; this includes most characters
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that can be part of a word in any language, as well as numbers and
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the underscore. If the :const:`ASCII` flag is used, only
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``[a-zA-Z0-9_]`` is matched.
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Matches Unicode word characters; this includes alphanumeric characters (as defined by :meth:`str.isalnum`)
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as well as the underscore (``_``).
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If the :const:`ASCII` flag is used, only ``[a-zA-Z0-9_]`` is matched.
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For 8-bit (bytes) patterns:
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Matches characters considered alphanumeric in the ASCII character set;

‎_sources/library/stdtypes.rst.txt

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@@ -1623,25 +1623,28 @@ expression support in the :mod:`re` module).
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.. method:: str.encode(encoding="utf-8", errors="strict")
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Return an encoded version of the string as a bytes object. Default encoding
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is ``'utf-8'``. *errors* may be given to set a different error handling scheme.
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The default for *errors* is ``'strict'``, meaning that encoding errors raise
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a :exc:`UnicodeError`. Other possible
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values are ``'ignore'``, ``'replace'``, ``'xmlcharrefreplace'``,
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``'backslashreplace'`` and any other name registered via
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:func:`codecs.register_error`, see section :ref:`error-handlers`. For a
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list of possible encodings, see section :ref:`standard-encodings`.
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By default, the *errors* argument is not checked for best performances, but
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only used at the first encoding error. Enable the :ref:`Python Development
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Mode <devmode>`, or use a :ref:`debug build <debug-build>` to check
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*errors*.
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Return the string encoded to :class:`bytes`.
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*encoding* defaults to ``'utf-8'``;
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see :ref:`standard-encodings` for possible values.
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*errors* controls how encoding errors are handled.
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If ``'strict'`` (the default), a :exc:`UnicodeError` exception is raised.
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Other possible values are ``'ignore'``,
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``'replace'``, ``'xmlcharrefreplace'``, ``'backslashreplace'`` and any
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other name registered via :func:`codecs.register_error`.
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See :ref:`error-handlers` for details.
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For performance reasons, the value of *errors* is not checked for validity
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unless an encoding error actually occurs,
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:ref:`devmode` is enabled
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or a :ref:`debug build <debug-build>` is used.
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.. versionchanged:: 3.1
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Support for keyword arguments added.
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Added support for keyword arguments.
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.. versionchanged:: 3.9
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The *errors* is now checked in development mode and
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The value of the *errors* argument is now checked in :ref:`devmode` and
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in :ref:`debug mode <debug-build>`.
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.. method:: bytes.decode(encoding="utf-8", errors="strict")
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bytearray.decode(encoding="utf-8", errors="strict")
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Return a string decoded from the given bytes. Default encoding is
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``'utf-8'``. *errors* may be given to set a different
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error handling scheme. The default for *errors* is ``'strict'``, meaning
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that encoding errors raise a :exc:`UnicodeError`. Other possible values are
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``'ignore'``, ``'replace'`` and any other name registered via
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:func:`codecs.register_error`, see section :ref:`error-handlers`. For a
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list of possible encodings, see section :ref:`standard-encodings`.
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Return the bytes decoded to a :class:`str`.
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*encoding* defaults to ``'utf-8'``;
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see :ref:`standard-encodings` for possible values.
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*errors* controls how decoding errors are handled.
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If ``'strict'`` (the default), a :exc:`UnicodeError` exception is raised.
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Other possible values are ``'ignore'``, ``'replace'``,
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and any other name registered via :func:`codecs.register_error`.
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See :ref:`error-handlers` for details.
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By default, the *errors* argument is not checked for best performances, but
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only used at the first decoding error. Enable the :ref:`Python Development
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Mode <devmode>`, or use a :ref:`debug build <debug-build>` to check *errors*.
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For performance reasons, the value of *errors* is not checked for validity
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unless a decoding error actually occurs,
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:ref:`devmode` is enabled or a :ref:`debug build <debug-build>` is used.
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.. note::
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Passing the *encoding* argument to :class:`str` allows decoding any
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:term:`bytes-like object` directly, without needing to make a temporary
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bytes or bytearray object.
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:class:`!bytes` or :class:`!bytearray` object.
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.. versionchanged:: 3.1
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Added support for keyword arguments.
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.. versionchanged:: 3.9
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The *errors* is now checked in development mode and
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The value of the *errors* argument is now checked in :ref:`devmode` and
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‎_sources/library/weakref.rst.txt

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application without adding attributes to those objects. This can be especially
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useful with objects that override attribute accesses.
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Note that when a key with equal value to an existing key (but not equal identity)
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is inserted into the dictionary, it replaces the value but does not replace the
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existing key. Due to this, when the reference to the original key is deleted, it
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also deletes the entry in the dictionary::
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>>> class T(str): pass
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...
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>>> k1, k2 = T(), T()
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>>> d = weakref.WeakKeyDictionary()
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>>> d[k1] = 1 # d = {k1: 1}
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>>> d[k2] = 2 # d = {k1: 2}
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>>> del k1 # d = {}
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A workaround would be to remove the key prior to reassignment::
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>>> class T(str): pass
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...
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>>> k1, k2 = T(), T()
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>>> d = weakref.WeakKeyDictionary()
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>>> d[k1] = 1 # d = {k1: 1}
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>>> del d[k1]
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>>> d[k2] = 2 # d = {k2: 2}
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>>> del k1 # d = {k2: 2}
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.. versionchanged:: 3.9
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Added support for ``|`` and ``|=`` operators, specified in :pep:`584`.
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‎_sources/reference/executionmodel.rst.txt

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is subtle. Python lacks declarations and allows name binding operations to
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occur anywhere within a code block. The local variables of a code block can be
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determined by scanning the entire text of the block for name binding operations.
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See :ref:`the FAQ entry on UnboundLocalError <faq-unboundlocalerror>`
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for examples.
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If the :keyword:`global` statement occurs within a block, all uses of the names
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‎about.html

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<a href="/bugs.html">Found a bug</a>?
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‎bugs.html

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<section id="getting-started-contributing-to-python-yourself">
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<span id="contributing-to-python"></span><h2>開始讓自己貢獻 Python<a class="headerlink" href="#getting-started-contributing-to-python-yourself" title="本標頭的永久連結"></a></h2>
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<p>除了只是回報您所發現的錯誤之外，同樣也歡迎您提交修正它們的修補程式 (patch)。您可以在 <a class="reference external" href="https://mail.python.org/mailman3/lists/core-mentorship.python.org/">Python 開發者指南</a>中找到如何開始修補 Python 的更多資訊。如果您有任何問題，<a class="reference external" href="https://devguide.python.org/">核心導師郵寄清單</a>是一個友善的地方，您可以在那裡得到，關於 Python 修正錯誤的過程中，所有問題的答案。</p>
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<p>除了只是回報您所發現的錯誤之外，同樣也歡迎您提交修正它們的修補程式 (patch)。您可以在 <a class="reference external" href="https://devguide.python.org/">Python 開發者指南</a>中找到如何開始修補 Python 的更多資訊。如果您有任何問題，<a class="reference external" href="https://mail.python.org/mailman3/lists/core-mentorship.python.org/">核心導師郵寄清單</a>是一個友善的地方，您可以在那裡得到，關於 Python 修正錯誤的過程中，所有問題的答案。</p>
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