[clean] drop obsolete py3.7 compatibility

- https://github.com/searxng/searxng/discussions/2356

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/compat.py

@@ -1,73 +0,0 @@
-# SPDX-License-Identifier: AGPL-3.0-or-later
-# lint: pylint
-# pyright: basic
-"""Module for backward compatibility.
-
-"""
-# pylint: disable=C,R
-
-
-__all__ = ('cached_property',)
-
-
-try:
-    from functools import cached_property  # type: ignore
-
-except ImportError:
-
-    # cache_property has been added in py3.8 [1]
-    #
-    # To support cache_property in py3.7 the implementation from 3.8 has been
-    # copied here.  This code can be cleanup with EOL of py3.7.
-    #
-    # [1] https://docs.python.org/3/library/functools.html#functools.cached_property
-
-    from threading import RLock
-
-    _NOT_FOUND = object()
-
-    class cached_property:
-        def __init__(self, func):
-            self.func = func
-            self.attrname = None
-            self.__doc__ = func.__doc__
-            self.lock = RLock()
-
-        def __set_name__(self, owner, name):
-            if self.attrname is None:
-                self.attrname = name
-            elif name != self.attrname:
-                raise TypeError(
-                    "Cannot assign the same cached_property to two different names "
-                    f"({self.attrname!r} and {name!r})."
-                )
-
-        def __get__(self, instance, owner=None):
-            if instance is None:
-                return self
-            if self.attrname is None:
-                raise TypeError("Cannot use cached_property instance without calling __set_name__ on it.")
-            try:
-                cache = instance.__dict__
-            except AttributeError:  # not all objects have __dict__ (e.g. class defines slots)
-                msg = (
-                    f"No '__dict__' attribute on {type(instance).__name__!r} "
-                    f"instance to cache {self.attrname!r} property."
-                )
-                raise TypeError(msg) from None
-            val = cache.get(self.attrname, _NOT_FOUND)
-            if val is _NOT_FOUND:
-                with self.lock:
-                    # check if another thread filled cache while we awaited lock
-                    val = cache.get(self.attrname, _NOT_FOUND)
-                    if val is _NOT_FOUND:
-                        val = self.func(instance)
-                        try:
-                            cache[self.attrname] = val
-                        except TypeError:
-                            msg = (
-                                f"The '__dict__' attribute on {type(instance).__name__!r} instance "
-                                f"does not support item assignment for caching {self.attrname!r} property."
-                            )
-                            raise TypeError(msg) from None
-            return val

searx/infopage/__init__.py

@@ -27,12 +27,12 @@ import logging
 import typing
 
 import urllib.parse
+from functools import cached_property
 import jinja2
 from flask.helpers import url_for
 from markdown_it import MarkdownIt
 
 from .. import get_setting
-from ..compat import cached_property
 from ..version import GIT_URL
 from ..locales import LOCALE_NAMES