[dependencies] Create module with all dependency imports

yt_dlp/dependencies.py

@@ -0,0 +1,77 @@
+# flake8: noqa: F401
+
+try:
+    import brotlicffi as brotli
+except ImportError:
+    try:
+        import brotli
+    except ImportError:
+        brotli = None
+
+
+try:
+    import certifi
+except ImportError:
+    certifi = None
+else:
+    from os.path import exists as _path_exists
+
+    # The certificate may not be bundled in executable
+    if not _path_exists(certifi.where()):
+        certifi = None
+
+
+try:
+    from Cryptodome.Cipher import AES as Cryptodome_AES
+except ImportError:
+    try:
+        from Crypto.Cipher import AES as Cryptodome_AES
+    except ImportError:
+        Cryptodome_AES = None
+
+
+try:
+    import mutagen
+except ImportError:
+    mutagen = None
+
+
+secretstorage = None
+try:
+    import secretstorage
+    _SECRETSTORAGE_UNAVAILABLE_REASON = None
+except ImportError:
+    _SECRETSTORAGE_UNAVAILABLE_REASON = (
+        'as the `secretstorage` module is not installed. '
+        'Please install by running `python3 -m pip install secretstorage`')
+except Exception as _err:
+    _SECRETSTORAGE_UNAVAILABLE_REASON = f'as the `secretstorage` module could not be initialized. {_err}'
+
+
+try:
+    import sqlite3
+except ImportError:
+    # although sqlite3 is part of the standard library, it is possible to compile python without
+    # sqlite support. See: https://github.com/yt-dlp/yt-dlp/issues/544
+    sqlite3 = None
+
+
+try:
+    import websockets
+except (ImportError, SyntaxError):
+    # websockets 3.10 on python 3.6 causes SyntaxError
+    # See https://github.com/yt-dlp/yt-dlp/issues/2633
+    websockets = None
+
+
+all_dependencies = {k: v for k, v in globals().items() if not k.startswith('_')}
+
+
+available_dependencies = {k: v for k, v in all_dependencies.items() if v}
+
+
+__all__ = [
+    'all_dependencies',
+    'available_dependencies',
+    *all_dependencies.keys(),
+]