Enable strict_bytes by default #18371
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Diff from mypy_primer, showing the effect of this PR on open source code: aioredis (https://github.com/aio-libs/aioredis)
+ aioredis/connection.py:952: error: Argument 1 to "append" of "list" has incompatible type "bytes | memoryview[int]"; expected "bytes" [arg-type]
+ aioredis/connection.py:981: error: Subclass of "bytes" and "memoryview[Any]" cannot exist: "memoryview" is final [unreachable]
+ aioredis/connection.py:987: error: Subclass of "bytes" and "memoryview[Any]" cannot exist: "memoryview" is final [unreachable]
mitmproxy (https://github.com/mitmproxy/mitmproxy)
+ mitmproxy/dns.py:412: error: Argument 1 to "unpack_from_with_compression" has incompatible type "bytes | bytearray"; expected "bytes" [arg-type]
+ mitmproxy/dns.py:446: error: Argument 1 to "decompress_from_record_data" has incompatible type "bytes | bytearray"; expected "bytes" [arg-type]
+ mitmproxy/dns.py:449: error: Argument 5 to "ResourceRecord" has incompatible type "bytes | bytearray"; expected "bytes" [arg-type]
+ mitmproxy/proxy/layers/tls.py:570: error: Argument 1 to "dtls_parse_client_hello" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ mitmproxy/proxy/layers/tls.py:572: error: Argument 1 to "parse_client_hello" has incompatible type "bytearray"; expected "bytes" [arg-type]
steam.py (https://github.com/Gobot1234/steam.py)
+ steam/app.py:246: error: Argument 1 to "verify_signature" has incompatible type "memoryview[int]"; expected "bytes" [arg-type]
+ steam/state.py:3004: error: Argument 1 to "receive" of "SteamWebSocket" has incompatible type "bytearray"; expected "bytes" [arg-type]
urllib3 (https://github.com/urllib3/urllib3)
+ src/urllib3/util/ssltransport.py:108: error: Argument 1 to "send" of "SSLTransport" has incompatible type "memoryview[int]"; expected "bytes" [arg-type]
+ src/urllib3/response.py:409: error: Incompatible return value type (got "bytes | memoryview[bytes]", expected "bytes") [return-value]
+ test/test_ssltransport.py:57: error: Non-overlapping equality check (left operand type: "bytearray", right operand type: "str | bytes") [comparison-overlap]
+ test/test_ssltransport.py:548: error: Argument 1 to "sendall" of "SSLTransport" has incompatible type "bytearray"; expected "bytes" [arg-type]
dd-trace-py (https://github.com/DataDog/dd-trace-py)
+ ddtrace/internal/test_visibility/coverage_lines.py:74: error: Incompatible return value type (got "bytearray", expected "bytes") [return-value]
trio (https://github.com/python-trio/trio)
+ src/trio/_unix_pipes.py:130: error: Argument 1 of "send_all" is incompatible with supertype "trio._abc.SendStream"; supertype defines the argument type as "bytes | bytearray | memoryview[int]" [override]
+ src/trio/_unix_pipes.py:130: note: This violates the Liskov substitution principle
+ src/trio/_unix_pipes.py:130: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#incompatible-overrides
+ src/trio/_highlevel_generic.py:118: error: Incompatible return value type (got "bytes | bytearray", expected "bytes") [return-value]
+ src/trio/_tests/test_testing.py:421: error: Incompatible return value type (got "bytearray", expected "bytes") [return-value]
+ src/trio/_tests/test_ssl.py:255: error: Argument 1 of "send_all" is incompatible with supertype "trio._abc.SendStream"; supertype defines the argument type as "bytes | bytearray | memoryview[int]" [override]
+ src/trio/_tests/test_ssl.py:255: note: This violates the Liskov substitution principle
+ src/trio/_tests/test_ssl.py:255: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#incompatible-overrides
+ src/trio/_tests/test_dtls.py:501: error: No overload variant of "sendto" of "SocketType" matches argument types "Sequence[int]", "tuple[str, int]" [call-overload]
+ src/trio/_tests/test_dtls.py:501: note: Possible overload variants:
+ src/trio/_tests/test_dtls.py:501: note: def sendto(self, Buffer, tuple[object, ...] | str | Buffer, /) -> Coroutine[Any, Any, int]
+ src/trio/_tests/test_dtls.py:501: note: def sendto(self, Buffer, int, tuple[object, ...] | str | Buffer, /) -> Coroutine[Any, Any, int]
+ src/trio/_tests/test_dtls.py:535: error: Argument "payload" to "evolve" of "UDPPacket" has incompatible type "bytearray"; expected "bytes" [arg-type]
pycryptodome (https://github.com/Legrandin/pycryptodome)
+ lib/Crypto/Cipher/_mode_kw.py:25: error: Incompatible return value type (got "bytes | bytearray", expected "bytes") [return-value]
+ lib/Crypto/Cipher/_mode_kw.py:39: error: Argument 1 to "strxor" has incompatible type "bytes | bytearray"; expected "bytes" [arg-type]
+ lib/Crypto/Cipher/_mode_kw.py:43: error: Incompatible return value type (got "bytes | bytearray", expected "bytes") [return-value]
pwndbg (https://github.com/pwndbg/pwndbg)
+ pwndbg/aglib/file.py: note: In function "gdb_memtox_inverse":
+ pwndbg/aglib/file.py:271: error: Incompatible return value type (got "bytearray", expected "bytes") [return-value]
+ pwndbg/aglib/macho.py: note: In member "_walk" of class "_RawTrie":
+ pwndbg/aglib/macho.py:90: error: Argument 2 has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/macho.py: note: In member "keys" of class "DyldSharedCacheHashSet":
+ pwndbg/aglib/macho.py:406: error: Incompatible types in "yield" (actual type "bytearray", expected type "bytes") [misc]
+ pwndbg/aglib/macho.py: note: In member "images" of class "DyldSharedCache":
+ pwndbg/aglib/macho.py:578: error: Incompatible types in "yield" (actual type "tuple[bytearray, Any]", expected type "tuple[bytes, int]") [misc]
+ pwndbg/aglib/objc.py: note: In member "name" of class "_ClassRoPtr":
+ pwndbg/aglib/objc.py:124: error: Incompatible return value type (got "bytearray", expected "bytes") [return-value]
+ pwndbg/aglib/objc.py: note: In member "demangled_name" of class "_ClassRwExtPtr":
+ pwndbg/aglib/objc.py:190: error: Incompatible return value type (got "bytearray", expected "bytes | None") [return-value]
+ pwndbg/aglib/objc.py: note: In member "name" of class "InstanceVariable":
+ pwndbg/aglib/objc.py:656: error: Incompatible return value type (got "bytearray", expected "bytes") [return-value]
+ pwndbg/aglib/objc.py: note: In member "typename" of class "InstanceVariable":
+ pwndbg/aglib/objc.py:665: error: Incompatible return value type (got "bytearray", expected "bytes") [return-value]
+ pwndbg/aglib/objc.py: note: In member "name" of class "ClassProperty":
+ pwndbg/aglib/objc.py:699: error: Incompatible return value type (got "bytearray", expected "bytes") [return-value]
+ pwndbg/aglib/objc.py: note: In member "value" of class "ClassProperty":
+ pwndbg/aglib/objc.py:706: error: Incompatible return value type (got "bytearray", expected "bytes") [return-value]
+ pwndbg/aglib/objc.py: note: In member "name" of class "Selector":
+ pwndbg/aglib/objc.py:733: error: Incompatible return value type (got "bytearray", expected "bytes") [return-value]
+ pwndbg/aglib/objc.py: note: In member "types" of class "Method":
+ pwndbg/aglib/objc.py:798: error: Incompatible return value type (got "bytearray", expected "bytes") [return-value]
+ pwndbg/commands/hexdump.py: note: In function "hexdump":
+ pwndbg/commands/hexdump.py:164: error: Argument 1 to "format_py" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/commands/hexdump.py:164: error: Argument 1 to "format_c" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/commands/hexdump.py:169: error: Argument 1 to "hexdump" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py: note: In function "read_buildversion":
+ pwndbg/aglib/godbg.py:294: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py:295: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py: note: In function "get_go_version":
+ pwndbg/aglib/godbg.py:325: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py: note: In function "read_varint_str":
+ pwndbg/aglib/godbg.py:418: error: Incompatible return value type (got "bytearray", expected "bytes") [return-value]
+ pwndbg/aglib/godbg.py:425: error: Incompatible return value type (got "bytearray", expected "bytes") [return-value]
+ pwndbg/aglib/godbg.py: note: In function "read_type_name":
+ pwndbg/aglib/godbg.py:439: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py:442: error: Incompatible return value type (got "bytearray", expected "bytes") [return-value]
+ pwndbg/aglib/godbg.py: note: In function "_inner_decode_runtime_type":
+ pwndbg/aglib/godbg.py:596: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py:688: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py:689: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py:739: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py:744: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py:746: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py: note: In member "dump" of class "BasicType":
+ pwndbg/aglib/godbg.py:795: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py:798: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py:800: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py:806: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py:818: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py:819: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py:823: error: Argument 1 to "load_int" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py:825: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py:830: error: Argument 1 to "load_float" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py:833: error: Argument 1 to "load_float" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py:834: error: Argument 1 to "load_float" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py:843: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py:844: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py: note: In member "dump" of class "SliceType":
+ pwndbg/aglib/godbg.py:910: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py:911: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py:918: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py: note: In member "dump" of class "PointerType":
+ pwndbg/aglib/godbg.py:950: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py: note: In member "dump_noswiss" of class "MapType":
+ pwndbg/aglib/godbg.py:1156: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py:1190: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py: note: In member "dump_swiss" of class "MapType":
+ pwndbg/aglib/godbg.py:1196: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py:1197: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py:1211: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py:1216: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
+ pwndbg/aglib/godbg.py:1217: error: Argument 1 to "load_uint" has incompatible type "bytearray"; expected "bytes" [arg-type]
git-revise (https://github.com/mystor/git-revise)
+ gitrevise/utils.py:127: error: Incompatible return value type (got "bytearray", expected "bytes") [return-value]
|
hauntsaninja
commented
Feb 2, 2026
| elif self.disable_bytearray_promotion and self.disable_memoryview_promotion: | ||
| # forwards compatibility | ||
| self.strict_bytes = True | ||
| else: |
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This was done in #19002 and I don't think that's correct
There is a weird interaction that exists between specifying both --no-strict-bytes and one of these (undocumented) flags, but maybe that is a better fit for more generalised "preset" handling in config
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For mypy v2