#?Copyright?2007?Google?Inc.?All?Rights?Reserved.
#?Licensed?to?PSF?under?a?Contributor?Agreement.

“““Abstract?base?Classes?（ABCs）?according?to?PEP?3119.“““

import?types

from?_weakrefset?import?WeakSet

#?Instance?of?old-style?class
class?_C:?pass
_InstanceType?=?type（_C（））


def?abstractmethod（funcobj）:
????“““A?decorator?indicating?abstract?methods.

????Requires?that?the?metaclass?is?ABCmeta?or?derived?from?it.??A
????class?that?has?a?metaclass?derived?from?ABCmeta?cannot?be
????instantiated?unless?all?of?its?abstract?methods?are?overridden.
????The?abstract?methods?can?be?called?using?any?of?the?normal
????‘super‘?call?mechanisms.

????Usage:

????????class?C:
????????????__metaclass__?=?ABCmeta
????????????@abstractmethod
????????????def?my_abstract_method（self?...）:
????????????????...
????“““
????funcobj.__isabstractmethod__?=?True
????return?funcobj


class?abstractproperty（property）:
????“““A?decorator?indicating?abstract?properties.

????Requires?that?the?metaclass?is?ABCmeta?or?derived?from?it.??A
????class?that?has?a?metaclass?derived?from?ABCmeta?cannot?be
????instantiated?unless?all?of?its?abstract?properties?are?overridden.
????The?abstract?properties?can?be?called?using?any?of?the?normal
????‘super‘?call?mechanisms.

????Usage:

????????class?C:
????????????__metaclass__?=?ABCmeta
????????????@abstractproperty
????????????def?my_abstract_property（self）:
????????????????...

????This?defines?a?read-only?property;?you?can?also?define?a?read-write
????abstract?property?using?the?‘long‘?form?of?property?declaration:

????????class?C:
????????????__metaclass__?=?ABCmeta
????????????def?getx（self）:?...
????????????def?setx（self?value）:?...
????????????x?=?abstractproperty（getx?setx）
????“““
????__isabstractmethod__?=?True


class?ABCmeta（type）:

????“““metaclass?for?defining?Abstract?base?Classes?（ABCs）.

????Use?this?metaclass?to?create?an?ABC.??An?ABC?can?be?subclassed
????directly?and?then?acts?as?a?mix-in?class.??You?can?also?register
????unrelated?concrete?classes?（even?built-in?classes）?and?unrelated
????ABCs?as?‘virtual?subclasses‘?--?these?and?their?descendants?will
????be?considered?subclasses?of?the?registering?ABC?by?the?built-in
????issubclass（）?function?but?the?registering?ABC?won‘t?show?up?in
????their?MRO?（Method?Resolution?Order）?nor?will?method
????implementations?defined?by?the?registering?ABC?be?callable?（not
????even?via?super（））.

????“““

????#?A?global?counter?that?is?incremented?each?time?a?class?is
????#?registered?as?a?virtual?subclass?of?anything.??It?forces?the
????#?negative?cache?to?be?cleared?before?its?next?use.
????_abc_invalidation_counter?=?0

????def?__new__（mcls?name?bases?namespace）:
????????cls?=?super（ABCmeta?mcls）.__new__（mcls?name?bases?namespace）
????????#?Compute?set?of?abstract?method?names
????????abstracts?=?set（name
?????????????????????for?name?value?in?namespace.items（）
????????????

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件?????793600??2013-09-29?03:01??MinGW64（支持C++20標準）\bin\addr2line.exe

?????文件?????816128??2013-09-29?03:01??MinGW64（支持C++20標準）\bin\ar.exe

?????文件????1272320??2013-09-29?03:01??MinGW64（支持C++20標準）\bin\as.exe

?????文件?????722944??2013-10-07?00:52??MinGW64（支持C++20標準）\bin\c++.exe

?????文件?????792576??2013-09-29?03:01??MinGW64（支持C++20標準）\bin\c++filt.exe

?????文件?????721408??2013-10-07?00:52??MinGW64（支持C++20標準）\bin\cpp.exe

?????文件?????845824??2013-09-29?03:01??MinGW64（支持C++20標準）\bin\dlltool.exe

?????文件??????47104??2013-09-29?03:01??MinGW64（支持C++20標準）\bin\dllwrap.exe

?????文件??????33792??2013-09-29?03:01??MinGW64（支持C++20標準）\bin\elfedit.exe

?????文件?????722944??2013-10-07?00:52??MinGW64（支持C++20標準）\bin\g++.exe

?????文件??????51712??2013-10-07?00:52??MinGW64（支持C++20標準）\bin\gcc-ar.exe

?????文件??????51712??2013-10-07?00:52??MinGW64（支持C++20標準）\bin\gcc-nm.exe

?????文件??????51712??2013-10-07?00:52??MinGW64（支持C++20標準）\bin\gcc-ranlib.exe

?????文件?????720384??2013-10-07?00:52??MinGW64（支持C++20標準）\bin\gcc.exe

?????文件?????296960??2013-10-07?00:52??MinGW64（支持C++20標準）\bin\gcov.exe

?????文件????4760064??2013-09-29?03:13??MinGW64（支持C++20標準）\bin\gdb.exe

?????文件???30595068??2013-09-15?09:52??MinGW64（支持C++20標準）\bin\gdb32.exe

?????文件?????208896??2013-09-29?03:13??MinGW64（支持C++20標準）\bin\gdbserver.exe

?????文件?????908334??2013-09-15?09:52??MinGW64（支持C++20標準）\bin\gdbserver32.exe

?????文件?????855552??2013-09-29?03:01??MinGW64（支持C++20標準）\bin\gprof.exe

?????文件????1147392??2013-09-29?03:01??MinGW64（支持C++20標準）\bin\ld.bfd.exe

?????文件????1147392??2013-09-29?03:01??MinGW64（支持C++20標準）\bin\ld.exe

?????文件???????7330??2011-03-08?23:46??MinGW64（支持C++20標準）\bin\lib\abc.py

?????文件???????6242??2020-08-16?16:56??MinGW64（支持C++20標準）\bin\lib\abc.pyc

?????文件??????34709??2013-03-23?13:04??MinGW64（支持C++20標準）\bin\lib\aifc.py

?????文件?????????64??2011-03-08?23:46??MinGW64（支持C++20標準）\bin\lib\antigravity.py

?????文件???????2748??2011-05-30?19:54??MinGW64（支持C++20標準）\bin\lib\anydbm.py

?????文件??????90891??2013-03-23?13:04??MinGW64（支持C++20標準）\bin\lib\argparse.py

?????文件??????12116??2011-03-08?23:46??MinGW64（支持C++20標準）\bin\lib\ast.py

?????文件??????11716??2011-03-08?23:46??MinGW64（支持C++20標準）\bin\lib\asynchat.py

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