Hi Daniel, I just NMU'd a a fix for this, since this was blocking mypy transition. Debdiff is attached with this email, could you please apply this upstream and/or in the deb package?
Regards, Nilesh
diff -Nru python-sop-0.2.0/debian/changelog python-sop-0.2.0/debian/changelog
--- python-sop-0.2.0/debian/changelog 2020-08-31 04:14:09.000000000 +0530
+++ python-sop-0.2.0/debian/changelog 2022-01-17 18:33:40.000000000 +0530
@@ -1,3 +1,11 @@
+python-sop (0.2.0-1.2) unstable; urgency=medium
+
+ * Non-maintainer upload.
+ * Add patch to fix FTBFS with mypy version 0.931-1
+ (Closes: #1003561)
+
+ -- Nilesh Patra <nil...@debian.org> Mon, 17 Jan 2022 18:33:40 +0530
+
python-sop (0.2.0-1.1) unstable; urgency=medium
* Non-maintainer upload.
diff -Nru python-sop-0.2.0/debian/patches/fix-test-with-new-mypy.patch
python-sop-0.2.0/debian/patches/fix-test-with-new-mypy.patch
--- python-sop-0.2.0/debian/patches/fix-test-with-new-mypy.patch
1970-01-01 05:30:00.000000000 +0530
+++ python-sop-0.2.0/debian/patches/fix-test-with-new-mypy.patch
2022-01-17 18:16:10.000000000 +0530
@@ -0,0 +1,33 @@
+--- a/sop/__init__.py
++++ b/sop/__init__.py
+@@ -96,7 +96,7 @@
+ from binascii import unhexlify, hexlify
+ from datetime import datetime, timezone
+ from argparse import ArgumentParser, _SubParsersAction, Namespace
+-from typing import List, Optional, Dict, Sequence, MutableMapping, Tuple,
BinaryIO
++from typing import List, Optional, Dict, Sequence, MutableMapping, Tuple,
BinaryIO, TYPE_CHECKING
+
+ from .__version__ import __version__
+
+@@ -221,7 +221,7 @@
+ self._parser = ArgumentParser(prog=name, description=description)
+ self._parser.add_argument('--debug', action='store_true',
+ help='show debugging data')
+- _cmds:_SubParsersAction = self._parser.add_subparsers(required=True,
++ _cmds:_SubParsersAction[ArgumentParser] =
self._parser.add_subparsers(required=True,
+ metavar='SUBCOMMAND',
+ dest='subcmd')
+ _subs = {}
+@@ -384,7 +384,11 @@
+ indirectout.write(data)
+ indirectout.close()
+
+- def extend_parsers(self, subcommands:_SubParsersAction,
++ if TYPE_CHECKING:
++ subparsertype = _SubParsersAction[ArgumentParser]
++ else:
++ subparsertype = _SubParsersAction
++ def extend_parsers(self, subcommands:subparsertype,
+ subparsers:Dict[str,ArgumentParser]) -> None:
+ '''override this function to add options or subcommands
+
diff -Nru python-sop-0.2.0/debian/patches/series
python-sop-0.2.0/debian/patches/series
--- python-sop-0.2.0/debian/patches/series 1970-01-01 05:30:00.000000000
+0530
+++ python-sop-0.2.0/debian/patches/series 2022-01-17 18:32:39.000000000
+0530
@@ -0,0 +1 @@
+fix-test-with-new-mypy.patch
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