Update translation from Transifex

Author: m-aciek

faq/programming.po

@@ -11,7 +11,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Python 3.9\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2021-01-01 05:02+0000\n"
+"POT-Creation-Date: 2021-04-04 05:56+0000\n"
 "PO-Revision-Date: 2017-02-16 17:43+0000\n"
 "Last-Translator: Stefan Ocetkiewicz <stefan.ocetkiewicz@gmail.com>, 2020\n"
 "Language-Team: Polish (https://www.transifex.com/python-doc/teams/5390/pl/)\n"
@@ -1556,6 +1556,84 @@ msgid ""
 "reference to the object:"
 msgstr ""
 
+msgid "When can I rely on identity tests with the *is* operator?"
+msgstr ""
+
+msgid ""
+"The ``is`` operator tests for object identity.  The test ``a is b`` is "
+"equivalent to ``id(a) == id(b)``."
+msgstr ""
+
+msgid ""
+"The most important property of an identity test is that an object is always "
+"identical to itself, ``a is a`` always returns ``True``.  Identity tests are "
+"usually faster than equality tests.  And unlike equality tests, identity "
+"tests are guaranteed to return a boolean ``True`` or ``False``."
+msgstr ""
+
+msgid ""
+"However, identity tests can *only* be substituted for equality tests when "
+"object identity is assured.  Generally, there are three circumstances where "
+"identity is guaranteed:"
+msgstr ""
+
+msgid ""
+"1) Assignments create new names but do not change object identity.  After "
+"the assignment ``new = old``, it is guaranteed that ``new is old``."
+msgstr ""
+
+msgid ""
+"2) Putting an object in a container that stores object references does not "
+"change object identity.  After the list assignment ``s[0] = x``, it is "
+"guaranteed that ``s[0] is x``."
+msgstr ""
+
+msgid ""
+"3) If an object is a singleton, it means that only one instance of that "
+"object can exist.  After the assignments ``a = None`` and ``b = None``, it "
+"is guaranteed that ``a is b`` because ``None`` is a singleton."
+msgstr ""
+
+msgid ""
+"In most other circumstances, identity tests are inadvisable and equality "
+"tests are preferred.  In particular, identity tests should not be used to "
+"check constants such as :class:`int` and :class:`str` which aren't "
+"guaranteed to be singletons::"
+msgstr ""
+
+msgid "Likewise, new instances of mutable containers are never identical::"
+msgstr ""
+
+msgid ""
+"In the standard library code, you will see several common patterns for "
+"correctly using identity tests:"
+msgstr ""
+
+msgid ""
+"1) As recommended by :pep:`8`, an identity test is the preferred way to "
+"check for ``None``.  This reads like plain English in code and avoids "
+"confusion with other objects that may have boolean values that evaluate to "
+"false."
+msgstr ""
+
+msgid ""
+"2) Detecting optional arguments can be tricky when ``None`` is a valid input "
+"value.  In those situations, you can create an singleton sentinel object "
+"guaranteed to be distinct from other objects.  For example, here is how to "
+"implement a method that behaves like :meth:`dict.pop`::"
+msgstr ""
+
+msgid ""
+"3) Container implementations sometimes need to augment equality tests with "
+"identity tests.  This prevents the code from being confused by objects such "
+"as ``float('NaN')`` that are not equal to themselves."
+msgstr ""
+
+msgid ""
+"For example, here is the implementation of :meth:`collections.abc.Sequence."
+"__contains__`::"
+msgstr ""
+
 msgid "Modules"
 msgstr ""
 

howto/descriptor.po

@@ -13,7 +13,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Python 3.9\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2021-03-14 05:42+0000\n"
+"POT-Creation-Date: 2021-04-04 05:56+0000\n"
 "PO-Revision-Date: 2017-02-16 17:44+0000\n"
 "Last-Translator: m_aciek <maciej.olko@gmail.com>, 2020\n"
 "Language-Team: Polish (https://www.transifex.com/python-doc/teams/5390/pl/)\n"
@@ -197,7 +197,7 @@ msgstr ""
 msgid "The new class now logs access to both *name* and *age*:"
 msgstr ""
 
-msgid "The two *Person* instances contain only the private names::"
+msgid "The two *Person* instances contain only the private names:"
 msgstr ""
 
 msgid "Closing thoughts"
@@ -694,7 +694,7 @@ msgid ""
 "where *cls* comes from in class methods, this is it!"
 msgstr ""
 
-msgid "Other kinds of methods"
+msgid "Kinds of methods"
 msgstr ""
 
 msgid ""

tutorial/datastructures.po

@@ -11,7 +11,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Python 3.9\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2021-01-01 05:02+0000\n"
+"POT-Creation-Date: 2021-04-04 05:56+0000\n"
 "PO-Revision-Date: 2017-02-16 23:40+0000\n"
 "Last-Translator: m_aciek <maciej.olko@gmail.com>, 2021\n"
 "Language-Team: Polish (https://www.transifex.com/python-doc/teams/5390/pl/)\n"
@@ -516,9 +516,8 @@ msgstr ""
 msgid ""
 "The comparison operators ``in`` and ``not in`` check whether a value occurs "
 "(does not occur) in a sequence.  The operators ``is`` and ``is not`` compare "
-"whether two objects are really the same object; this only matters for "
-"mutable objects like lists.  All comparison operators have the same "
-"priority, which is lower than that of all numerical operators."
+"whether two objects are really the same object.  All comparison operators "
+"have the same priority, which is lower than that of all numerical operators."
 msgstr ""
 
 msgid ""