14 files changed, 81 insertions, 77 deletions

diff --git a/libmat2/__init__.py b/libmat2/__init__.py
index 762686f..2f20265 100644
--- a/libmat2/__init__.py
+++ b/libmat2/__init__.py
@@ -2,7 +2,7 @@
 
 import enum
 import importlib
-from typing import Optional, Union
+from typing import Optional, Union, Dict
 
 from . import exiftool, video
 
@@ -66,8 +66,9 @@ CMD_DEPENDENCIES = {
     },
 }
 
-def check_dependencies() -> dict[str, dict[str, bool]]:
-    ret = dict()  # type: dict[str, dict]
+
+def check_dependencies() -> Dict[str, Dict[str, bool]]:
+    ret = dict()  # type: Dict[str, Dict]
 
     for key, value in DEPENDENCIES.items():
         ret[key] = {
diff --git a/libmat2/abstract.py b/libmat2/abstract.py
index 426ccfc..1aff630 100644
--- a/libmat2/abstract.py
+++ b/libmat2/abstract.py
@@ -1,7 +1,7 @@
 import abc
 import os
 import re
-from typing import Union
+from typing import Union, Set, Dict
 
 
 class AbstractParser(abc.ABC):
@@ -9,8 +9,8 @@ class AbstractParser(abc.ABC):
     It might yield `ValueError` on instantiation on invalid files,
     and `RuntimeError` when something went wrong in `remove_all`.
     """
-    meta_list = set()  # type: set[str]
-    mimetypes = set()  # type: set[str]
+    meta_list = set()  # type: Set[str]
+    mimetypes = set()  # type: Set[str]
 
     def __init__(self, filename: str) -> None:
         """
@@ -33,7 +33,7 @@ class AbstractParser(abc.ABC):
         self.sandbox = True
 
     @abc.abstractmethod
-    def get_meta(self) -> dict[str, Union[str, dict]]:
+    def get_meta(self) -> Dict[str, Union[str, Dict]]:
         """Return all the metadata of the current file"""
 
     @abc.abstractmethod
diff --git a/libmat2/archive.py b/libmat2/archive.py
index 25ff7f9..cbedcd2 100644
--- a/libmat2/archive.py
+++ b/libmat2/archive.py
@@ -7,7 +7,7 @@ import tempfile
 import os
 import logging
 import shutil
-from typing import Pattern, Union, Any
+from typing import Pattern, Union, Any, Set, Dict, List
 
 from . import abstract, UnknownMemberPolicy, parser_factory
 
@@ -44,16 +44,16 @@ class ArchiveBasedAbstractParser(abstract.AbstractParser):
     def __init__(self, filename):
         super().__init__(filename)
         # We ignore typing here because mypy is too stupid
-        self.archive_class = None  #  type: ignore
-        self.member_class = None  #  type: ignore
+        self.archive_class = None  # type: ignore
+        self.member_class = None  # type: ignore
 
         # Those are the files that have a format that _isn't_
         # supported by mat2, but that we want to keep anyway.
-        self.files_to_keep = set()  # type: set[Pattern]
+        self.files_to_keep = set()  # type: Set[Pattern]
 
         # Those are the files that we _do not_ want to keep,
         # no matter if they are supported or not.
-        self.files_to_omit = set()  # type: set[Pattern]
+        self.files_to_omit = set()  # type: Set[Pattern]
 
         # what should the parser do if it encounters an unknown file in
         # the archive?
@@ -72,7 +72,7 @@ class ArchiveBasedAbstractParser(abstract.AbstractParser):
         # pylint: disable=unused-argument
         return True  # pragma: no cover
 
-    def _specific_get_meta(self, full_path: str, file_path: str) -> dict[str, Any]:
+    def _specific_get_meta(self, full_path: str, file_path: str) -> Dict[str, Any]:
         """ This method can be used to extract specific metadata
         from files present in the archive."""
         # pylint: disable=unused-argument
@@ -87,7 +87,7 @@ class ArchiveBasedAbstractParser(abstract.AbstractParser):
 
     @staticmethod
     @abc.abstractmethod
-    def _get_all_members(archive: ArchiveClass) -> list[ArchiveMember]:
+    def _get_all_members(archive: ArchiveClass) -> List[ArchiveMember]:
         """Return all the members of the archive."""
 
     @staticmethod
@@ -97,7 +97,7 @@ class ArchiveBasedAbstractParser(abstract.AbstractParser):
 
     @staticmethod
     @abc.abstractmethod
-    def _get_member_meta(member: ArchiveMember) -> dict[str, str]:
+    def _get_member_meta(member: ArchiveMember) -> Dict[str, str]:
         """Return all the metadata of a given member."""
 
     @staticmethod
@@ -128,8 +128,8 @@ class ArchiveBasedAbstractParser(abstract.AbstractParser):
         # pylint: disable=unused-argument
         return member
 
-    def get_meta(self) -> dict[str, Union[str, dict]]:
-        meta = dict()  # type: dict[str, Union[str, dict]]
+    def get_meta(self) -> dict[str, Union[str, Dict]]:
+        meta = dict()  # type: Dict[str, Union[str, Dict]]
 
         with self.archive_class(self.filename) as zin:
             temp_folder = tempfile.mkdtemp()
@@ -264,6 +264,7 @@ class ArchiveBasedAbstractParser(abstract.AbstractParser):
 
 class TarParser(ArchiveBasedAbstractParser):
     mimetypes = {'application/x-tar'}
+
     def __init__(self, filename):
         super().__init__(filename)
         # yes, it's tarfile.open and not tarfile.TarFile,
@@ -336,7 +337,7 @@ class TarParser(ArchiveBasedAbstractParser):
         return member
 
     @staticmethod
-    def _get_member_meta(member: ArchiveMember) -> dict[str, str]:
+    def _get_member_meta(member: ArchiveMember) -> Dict[str, str]:
         assert isinstance(member, tarfile.TarInfo)  # please mypy
         metadata = {}
         if member.mtime != 0:
@@ -358,7 +359,7 @@ class TarParser(ArchiveBasedAbstractParser):
         archive.add(full_path, member.name, filter=TarParser._clean_member)  # type: ignore
 
     @staticmethod
-    def _get_all_members(archive: ArchiveClass) -> list[ArchiveMember]:
+    def _get_all_members(archive: ArchiveClass) -> List[ArchiveMember]:
         assert isinstance(archive, tarfile.TarFile)  # please mypy
         return archive.getmembers()  # type: ignore
 
@@ -391,7 +392,8 @@ class TarXzParser(TarParser):
 
 class ZipParser(ArchiveBasedAbstractParser):
     mimetypes = {'application/zip'}
-    def __init__(self, filename):
+
+    def __init__(self, filename: str):
         super().__init__(filename)
         self.archive_class = zipfile.ZipFile
         self.member_class = zipfile.ZipInfo
@@ -412,7 +414,7 @@ class ZipParser(ArchiveBasedAbstractParser):
         return member
 
     @staticmethod
-    def _get_member_meta(member: ArchiveMember) -> dict[str, str]:
+    def _get_member_meta(member: ArchiveMember) -> Dict[str, str]:
         assert isinstance(member, zipfile.ZipInfo)  # please mypy
         metadata = {}
         if member.create_system == 3:  # this is Linux
@@ -439,7 +441,7 @@ class ZipParser(ArchiveBasedAbstractParser):
                              compress_type=member.compress_type)
 
     @staticmethod
-    def _get_all_members(archive: ArchiveClass) -> list[ArchiveMember]:
+    def _get_all_members(archive: ArchiveClass) -> List[ArchiveMember]:
         assert isinstance(archive, zipfile.ZipFile)  # please mypy
         return archive.infolist()  # type: ignore
 
diff --git a/libmat2/audio.py b/libmat2/audio.py
index 366d451..aa4afdb 100644
--- a/libmat2/audio.py
+++ b/libmat2/audio.py
@@ -2,7 +2,7 @@ import mimetypes
 import os
 import shutil
 import tempfile
-from typing import Union
+from typing import Union, Dict
 
 import mutagen
 
@@ -18,10 +18,10 @@ class MutagenParser(abstract.AbstractParser):
         except mutagen.MutagenError:
             raise ValueError
 
-    def get_meta(self) -> dict[str, Union[str, dict]]:
+    def get_meta(self) -> Dict[str, Union[str, Dict]]:
         f = mutagen.File(self.filename)
         if f.tags:
-            return {k:', '.join(map(str, v)) for k, v in f.tags.items()}
+            return {k: ', '.join(map(str, v)) for k, v in f.tags.items()}
         return {}
 
     def remove_all(self) -> bool:
@@ -38,8 +38,8 @@ class MutagenParser(abstract.AbstractParser):
 class MP3Parser(MutagenParser):
     mimetypes = {'audio/mpeg', }
 
-    def get_meta(self) -> dict[str, Union[str, dict]]:
-        metadata = {}  # type: dict[str, Union[str, dict]]
+    def get_meta(self) -> Dict[str, Union[str, Dict]]:
+        metadata = {}  # type: Dict[str, Union[str, Dict]]
         meta = mutagen.File(self.filename).tags
         if not meta:
             return metadata
@@ -68,12 +68,12 @@ class FLACParser(MutagenParser):
         f.save(deleteid3=True)
         return True
 
-    def get_meta(self) -> dict[str, Union[str, dict]]:
+    def get_meta(self) -> Dict[str, Union[str, Dict]]:
         meta = super().get_meta()
         for num, picture in enumerate(mutagen.File(self.filename).pictures):
             name = picture.desc if picture.desc else 'Cover %d' % num
             extension = mimetypes.guess_extension(picture.mime)
-            if extension is None:  #  pragma: no cover
+            if extension is None: #  pragma: no cover
                 meta[name] = 'harmful data'
                 continue
 
@@ -98,6 +98,7 @@ class WAVParser(video.AbstractFFmpegParser):
                       'MIMEType', 'NumChannels', 'SampleRate', 'SourceFile',
                      }
 
+
 class AIFFParser(video.AbstractFFmpegParser):
     mimetypes = {'audio/aiff', 'audio/x-aiff'}
     meta_allowlist = {'AvgBytesPerSec', 'BitsPerSample', 'Directory',
diff --git a/libmat2/bubblewrap.py b/libmat2/bubblewrap.py
index 0e202b9..e59f111 100644
--- a/libmat2/bubblewrap.py
+++ b/libmat2/bubblewrap.py
@@ -12,7 +12,7 @@ import shutil
 import subprocess
 import tempfile
 import functools
-from typing import Optional
+from typing import Optional, List
 
 
 __all__ = ['PIPE', 'run', 'CalledProcessError']
@@ -33,7 +33,7 @@ def _get_bwrap_path() -> str:
 
 def _get_bwrap_args(tempdir: str,
                     input_filename: str,
-                    output_filename: Optional[str] = None) -> list[str]:
+                    output_filename: Optional[str] = None) -> List[str]:
     ro_bind_args = []
     cwd = os.getcwd()
 
diff --git a/libmat2/epub.py b/libmat2/epub.py
index 7613d35..3c5046a 100644
--- a/libmat2/epub.py
+++ b/libmat2/epub.py
@@ -3,10 +3,11 @@ import re
 import uuid
 import zipfile
 import xml.etree.ElementTree as ET  # type: ignore
-from typing import Any
+from typing import Any, Dict
 
 from . import archive, office
 
+
 class EPUBParser(archive.ZipParser):
     mimetypes = {'application/epub+zip', }
     metadata_namespace = '{http://purl.org/dc/elements/1.1/}'
@@ -28,7 +29,6 @@ class EPUBParser(archive.ZipParser):
              }))
         self.uniqid = uuid.uuid4()
 
-
     def is_archive_valid(self):
         super().is_archive_valid()
         with zipfile.ZipFile(self.filename) as zin:
@@ -37,7 +37,7 @@ class EPUBParser(archive.ZipParser):
                 if member_name.endswith('META-INF/encryption.xml'):
                     raise ValueError('the file contains encrypted fonts')
 
-    def _specific_get_meta(self, full_path, file_path) -> dict[str, Any]:
+    def _specific_get_meta(self, full_path, file_path) -> Dict[str, Any]:
         if not file_path.endswith('.opf'):
             return {}
 
@@ -73,7 +73,6 @@ class EPUBParser(archive.ZipParser):
                    short_empty_elements=False)
         return True
 
-
     def __handle_tocncx(self, full_path: str) -> bool:
         try:
             tree, namespace = office._parse_xml(full_path)
diff --git a/libmat2/exiftool.py b/libmat2/exiftool.py
index cdfce3d..5979a64 100644
--- a/libmat2/exiftool.py
+++ b/libmat2/exiftool.py
@@ -4,7 +4,7 @@ import logging
 import os
 import shutil
 import subprocess
-from typing import Union
+from typing import Union, Set, Dict
 
 from . import abstract
 from . import bubblewrap
@@ -15,9 +15,9 @@ class ExiftoolParser(abstract.AbstractParser):
     from a import file, hence why several parsers are re-using its `get_meta`
     method.
     """
-    meta_allowlist = set()  # type: set[str]
+    meta_allowlist = set()  # type: Set[str]
 
-    def get_meta(self) -> dict[str, Union[str, dict]]:
+    def get_meta(self) -> Dict[str, Union[str, Dict]]:
         try:
             if self.sandbox:
                 out = bubblewrap.run([_get_exiftool_path(), '-json',
diff --git a/libmat2/harmless.py b/libmat2/harmless.py
index 8688a9d..42b6eda 100644
--- a/libmat2/harmless.py
+++ b/libmat2/harmless.py
@@ -1,5 +1,5 @@
 import shutil
-from typing import Union
+from typing import Union, Dict
 from . import abstract
 
 
@@ -7,7 +7,7 @@ class HarmlessParser(abstract.AbstractParser):
     """ This is the parser for filetypes that can not contain metadata. """
     mimetypes = {'text/plain', 'image/x-ms-bmp'}
 
-    def get_meta(self) -> dict[str, Union[str, dict]]:
+    def get_meta(self) -> Dict[str, Union[str, Dict]]:
         return dict()
 
     def remove_all(self) -> bool:
diff --git a/libmat2/images.py b/libmat2/images.py
index 083ff64..e7cdf5a 100644
--- a/libmat2/images.py
+++ b/libmat2/images.py
@@ -1,6 +1,6 @@
 import os
 import re
-from typing import Union, Any
+from typing import Union, Any, Dict
 
 import cairo
 
@@ -48,7 +48,7 @@ class SVGParser(exiftool.ExiftoolParser):
         surface.finish()
         return True
 
-    def get_meta(self) -> dict[str, Union[str, dict]]:
+    def get_meta(self) -> Dict[str, Union[str, Dict]]:
         meta = super().get_meta()
 
         # The namespace is mandatory, but only the …/2000/svg is valid.
@@ -57,6 +57,7 @@ class SVGParser(exiftool.ExiftoolParser):
             meta.pop('Xmlns')
         return meta
 
+
 class PNGParser(exiftool.ExiftoolParser):
     mimetypes = {'image/png', }
     meta_allowlist = {'SourceFile', 'ExifToolVersion', 'FileName',
@@ -156,11 +157,12 @@ class TiffParser(GdkPixbufAbstractParser):
                       'FileTypeExtension', 'ImageHeight', 'ImageSize',
                       'ImageWidth', 'MIMEType', 'Megapixels', 'SourceFile'}
 
+
 class PPMParser(abstract.AbstractParser):
     mimetypes = {'image/x-portable-pixmap'}
 
-    def get_meta(self) -> dict[str, Union[str, dict]]:
-        meta = {}  # type: dict[str, Union[str, dict[Any, Any]]]
+    def get_meta(self) -> Dict[str, Union[str, Dict]]:
+        meta = {}  # type: Dict[str, Union[str, Dict[Any, Any]]]
         with open(self.filename) as f:
             for idx, line in enumerate(f):
                 if line.lstrip().startswith('#'):
@@ -176,9 +178,10 @@ class PPMParser(abstract.AbstractParser):
                         fout.write(line)
         return True
 
+
 class HEICParser(exiftool.ExiftoolParser):
     mimetypes = {'image/heic'}
-    meta_allowlist = {'SourceFile', 'ExifToolVersion', 'FileName','Directory',
+    meta_allowlist = {'SourceFile', 'ExifToolVersion', 'FileName', 'Directory',
             'FileSize', 'FileModifyDate', 'FileAccessDate',
             'FileInodeChangeDate', 'FilePermissions', 'FileType',
             'FileTypeExtension', 'MIMEType', 'MajorBrand', 'MinorVersion',
diff --git a/libmat2/office.py b/libmat2/office.py
index 8ccaa02..87a0b7e 100644
--- a/libmat2/office.py
+++ b/libmat2/office.py
@@ -4,7 +4,7 @@ import logging
 import os
 import re
 import zipfile
-from typing import Pattern, Any
+from typing import Pattern, Any, Tuple, Dict
 
 import xml.etree.ElementTree as ET  # type: ignore
 
@@ -12,7 +12,8 @@ from .archive import ZipParser
 
 # pylint: disable=line-too-long
 
-def _parse_xml(full_path: str) -> tuple[ET.ElementTree, dict[str, str]]:
+
+def _parse_xml(full_path: str) -> Tuple[ET.ElementTree, Dict[str, str]]:
     """ This function parses XML, with namespace support. """
     namespace_map = dict()
     for _, (key, value) in ET.iterparse(full_path, ("start-ns", )):
@@ -68,7 +69,6 @@ class MSOfficeParser(ZipParser):
         'application/vnd.openxmlformats-officedocument.wordprocessingml.settings+xml',
     }
 
-
     def __init__(self, filename):
         super().__init__(filename)
 
@@ -218,7 +218,7 @@ class MSOfficeParser(ZipParser):
         if 'w' not in namespace:
             return True
 
-        parent_map = {c:p for p in tree.iter() for c in p}
+        parent_map = {c: p for p in tree.iter() for c in p}
 
         elements_to_remove = list()
         for element in tree.iterfind('.//w:nsid', namespace):
@@ -229,7 +229,6 @@ class MSOfficeParser(ZipParser):
         tree.write(full_path, xml_declaration=True)
         return True
 
-
     @staticmethod
     def __remove_revisions(full_path: str) -> bool:
         try:
@@ -319,7 +318,6 @@ class MSOfficeParser(ZipParser):
             for i in re.findall(r'<p:cNvPr id="([0-9]+)"', content):
                 self.__counters['cNvPr'].add(int(i))
 
-
     @staticmethod
     def __randomize_creationId(full_path: str) -> bool:
         try:
@@ -441,8 +439,8 @@ class MSOfficeParser(ZipParser):
 
         with open(full_path, encoding='utf-8') as f:
             try:
-                results = re.findall(r"<(.+)>(.+)</\1>", f.read(), re.I|re.M)
-                return {k:v for (k, v) in results}
+                results = re.findall(r"<(.+)>(.+)</\1>", f.read(), re.I | re.M)
+                return {k: v for (k, v) in results}
             except (TypeError, UnicodeDecodeError):
                 # We didn't manage to parse the xml file
                 return {file_path: 'harmful content', }
@@ -459,7 +457,6 @@ class LibreOfficeParser(ZipParser):
         'application/vnd.oasis.opendocument.image',
     }
 
-
     def __init__(self, filename):
         super().__init__(filename)
 
diff --git a/libmat2/pdf.py b/libmat2/pdf.py
index 63ed9c1..8c3055f 100644
--- a/libmat2/pdf.py
+++ b/libmat2/pdf.py
@@ -7,7 +7,7 @@ import re
 import logging
 import tempfile
 import io
-from typing import Union
+from typing import Union, Dict
 
 import cairo
 import gi
@@ -18,6 +18,7 @@ from . import abstract
 
 FIXED_PDF_VERSION = cairo.PDFVersion.VERSION_1_5
 
+
 class PDFParser(abstract.AbstractParser):
     mimetypes = {'application/pdf', }
     meta_list = {'author', 'creation-date', 'creator', 'format', 'keywords',
@@ -140,13 +141,13 @@ class PDFParser(abstract.AbstractParser):
         return True
 
     @staticmethod
-    def __parse_metadata_field(data: str) -> dict[str, str]:
+    def __parse_metadata_field(data: str) -> Dict[str, str]:
         metadata = {}
         for (_, key, value) in re.findall(r"<(xmp|pdfx|pdf|xmpMM):(.+)>(.+)</\1:\2>", data, re.I):
             metadata[key] = value
         return metadata
 
-    def get_meta(self) -> dict[str, Union[str, dict]]:
+    def get_meta(self) -> Dict[str, Union[str, Dict]]:
         """ Return a dict with all the meta of the file
         """
         metadata = {}
diff --git a/libmat2/torrent.py b/libmat2/torrent.py
index c547a20..e6407ff 100644
--- a/libmat2/torrent.py
+++ b/libmat2/torrent.py
@@ -1,5 +1,5 @@
 import logging
-from typing import Union
+from typing import Union, Dict, List, Tuple
 
 from . import abstract
 
@@ -15,7 +15,7 @@ class TorrentParser(abstract.AbstractParser):
         if self.dict_repr is None:
             raise ValueError
 
-    def get_meta(self) -> dict[str, Union[str, dict]]:
+    def get_meta(self) -> Dict[str, Union[str, Dict]]:
         metadata = {}
         for key, value in self.dict_repr.items():
             if key not in self.allowlist:
@@ -56,7 +56,7 @@ class _BencodeHandler:
         }
 
     @staticmethod
-    def __decode_int(s: bytes) -> tuple[int, bytes]:
+    def __decode_int(s: bytes) -> Tuple[int, bytes]:
         s = s[1:]
         next_idx = s.index(b'e')
         if s.startswith(b'-0'):
@@ -66,7 +66,7 @@ class _BencodeHandler:
         return int(s[:next_idx]), s[next_idx+1:]
 
     @staticmethod
-    def __decode_string(s: bytes) -> tuple[bytes, bytes]:
+    def __decode_string(s: bytes) -> Tuple[bytes, bytes]:
         colon = s.index(b':')
         # FIXME Python3 is broken here, the call to `ord` shouldn't be needed,
         # but apparently it is. This is utterly idiotic.
@@ -76,7 +76,7 @@ class _BencodeHandler:
         s = s[1:]
         return s[colon:colon+str_len], s[colon+str_len:]
 
-    def __decode_list(self, s: bytes) -> tuple[list, bytes]:
+    def __decode_list(self, s: bytes) -> Tuple[List, bytes]:
         ret = list()
         s = s[1:]  # skip leading `l`
         while s[0] != ord('e'):
@@ -84,7 +84,7 @@ class _BencodeHandler:
             ret.append(value)
         return ret, s[1:]
 
-    def __decode_dict(self, s: bytes) -> tuple[dict, bytes]:
+    def __decode_dict(self, s: bytes) -> Tuple[Dict, bytes]:
         ret = dict()
         s = s[1:]  # skip leading `d`
         while s[0] != ord(b'e'):
@@ -113,10 +113,10 @@ class _BencodeHandler:
             ret += self.__encode_func[type(value)](value)
         return b'd' + ret + b'e'
 
-    def bencode(self, s: Union[dict, list, bytes, int]) -> bytes:
+    def bencode(self, s: Union[Dict, List, bytes, int]) -> bytes:
         return self.__encode_func[type(s)](s)
 
-    def bdecode(self, s: bytes) -> Union[dict, None]:
+    def bdecode(self, s: bytes) -> Union[Dict, None]:
         try:
             ret, trail = self.__decode_func[s[0]](s)
         except (IndexError, KeyError, ValueError) as e:
diff --git a/libmat2/video.py b/libmat2/video.py
index 4d33aa4..772a89e 100644
--- a/libmat2/video.py
+++ b/libmat2/video.py
@@ -3,7 +3,7 @@ import functools
 import shutil
 import logging
 
-from typing import Union
+from typing import Union, Dict
 
 from . import exiftool
 from . import bubblewrap
@@ -12,7 +12,7 @@ from . import bubblewrap
 class AbstractFFmpegParser(exiftool.ExiftoolParser):
     """ Abstract parser for all FFmpeg-based ones, mainly for video. """
     # Some fileformats have mandatory metadata fields
-    meta_key_value_allowlist = {}  # type: dict[str, Union[str, int]]
+    meta_key_value_allowlist = {}  # type: Dict[str, Union[str, int]]
 
     def remove_all(self) -> bool:
         if self.meta_key_value_allowlist:
@@ -45,10 +45,10 @@ class AbstractFFmpegParser(exiftool.ExiftoolParser):
             return False
         return True
 
-    def get_meta(self) -> dict[str, Union[str, dict]]:
+    def get_meta(self) -> Dict[str, Union[str, Dict]]:
         meta = super().get_meta()
 
-        ret = dict()  # type: dict[str, Union[str, dict]]
+        ret = dict()  # type: Dict[str, Union[str, Dict]]
         for key, value in meta.items():
             if key in self.meta_key_value_allowlist:
                 if value == self.meta_key_value_allowlist[key]:
diff --git a/libmat2/web.py b/libmat2/web.py
index 574bdd7..f2938e2 100644
--- a/libmat2/web.py
+++ b/libmat2/web.py
@@ -1,5 +1,5 @@
 from html import parser, escape
-from typing import  Any, Optional
+from typing import Any, Optional, Dict, List, Tuple, Set
 import re
 import string
 
@@ -25,7 +25,7 @@ class CSSParser(abstract.AbstractParser):
             f.write(cleaned)
         return True
 
-    def get_meta(self) -> dict[str, Any]:
+    def get_meta(self) -> Dict[str, Any]:
         metadata = {}
         with open(self.filename, encoding='utf-8') as f:
             try:
@@ -44,10 +44,10 @@ class CSSParser(abstract.AbstractParser):
 
 
 class AbstractHTMLParser(abstract.AbstractParser):
-    tags_blocklist = set()  # type: set[str]
+    tags_blocklist = set()  # type: Set[str]
     # In some html/xml-based formats some tags are mandatory,
     # so we're keeping them, but are discarding their content
-    tags_required_blocklist = set()  # type: set[str]
+    tags_required_blocklist = set()  # type: Set[str]
 
     def __init__(self, filename):
         super().__init__(filename)
@@ -57,7 +57,7 @@ class AbstractHTMLParser(abstract.AbstractParser):
             self.__parser.feed(f.read())
         self.__parser.close()
 
-    def get_meta(self) -> dict[str, Any]:
+    def get_meta(self) -> Dict[str, Any]:
         return self.__parser.get_meta()
 
     def remove_all(self) -> bool:
@@ -112,7 +112,7 @@ class _HTMLParser(parser.HTMLParser):
         """
         raise ValueError(message)
 
-    def handle_starttag(self, tag: str, attrs: list[tuple[str, Optional[str]]]):
+    def handle_starttag(self, tag: str, attrs: List[Tuple[str, Optional[str]]]):
         # Ignore the type, because mypy is too stupid to infer
         # that get_starttag_text() can't return None.
         original_tag = self.get_starttag_text()  # type: ignore
@@ -159,7 +159,7 @@ class _HTMLParser(parser.HTMLParser):
                     self.__textrepr += escape(data)
 
     def handle_startendtag(self, tag: str,
-                           attrs: list[tuple[str, Optional[str]]]):
+                           attrs: List[Tuple[str, Optional[str]]]):
         if tag in self.tag_required_blocklist | self.tag_blocklist:
             meta = {k:v for k, v in attrs}
             name = meta.get('name', 'harmful metadata')
@@ -184,7 +184,7 @@ class _HTMLParser(parser.HTMLParser):
             f.write(self.__textrepr)
         return True
 
-    def get_meta(self) -> dict[str, Any]:
+    def get_meta(self) -> Dict[str, Any]:
         if self.__validation_queue:
             raise ValueError("Some tags (%s) were left unclosed in %s" % (
                 ', '.join(self.__validation_queue),