[update] Ability to set a maximum version for specific variants

yt_dlp/utils.py

@@ -18,6 +18,7 @@ import html.parser
 import http.client
 import http.cookiejar
 import importlib.util
+import inspect
 import io
 import itertools
 import json
@@ -1909,12 +1910,23 @@ class DateRange:
 
 def platform_name():
     """ Returns the platform name as a str """
-    res = platform.platform()
-    if isinstance(res, bytes):
-        res = res.decode(preferredencoding())
+    write_string('DeprecationWarning: yt_dlp.utils.platform_name is deprecated, use platform.platform instead')
+    return platform.platform()
 
-    assert isinstance(res, str)
-    return res
+
+@functools.cache
+def system_identifier():
+    python_implementation = platform.python_implementation()
+    if python_implementation == 'PyPy' and hasattr(sys, 'pypy_version_info'):
+        python_implementation += ' version %d.%d.%d' % sys.pypy_version_info[:3]
+
+    return 'Python %s (%s %s) - %s %s' % (
+        platform.python_version(),
+        python_implementation,
+        platform.architecture()[0],
+        platform.platform(),
+        format_field(join_nonempty(*platform.libc_ver(), delim=' '), None, '(%s)'),
+    )
 
 
 @functools.cache
@@ -5544,8 +5556,27 @@ def merge_headers(*dicts):
     return {k.title(): v for k, v in itertools.chain.from_iterable(map(dict.items, dicts))}
 
 
+def cached_method(f):
+    """Cache a method"""
+    signature = inspect.signature(f)
+
+    @functools.wraps(f)
+    def wrapper(self, *args, **kwargs):
+        bound_args = signature.bind(self, *args, **kwargs)
+        bound_args.apply_defaults()
+        key = tuple(bound_args.arguments.values())
+
+        if not hasattr(self, '__cached_method__cache'):
+            self.__cached_method__cache = {}
+        cache = self.__cached_method__cache.setdefault(f.__name__, {})
+        if key not in cache:
+            cache[key] = f(self, *args, **kwargs)
+        return cache[key]
+    return wrapper
+
+
 class classproperty:
-    """classmethod(property(func)) that works in py < 3.9"""
+    """property access for class methods"""
 
     def __init__(self, func):
         functools.update_wrapper(self, func)