[cleanup] Remove obsolete Python compatibility code (#17357)

Authored by: doe1080

yt_dlp/utils/_utils.py

@@ -238,11 +238,9 @@ def find_xpath_attr(node, xpath, key, val=None):
     expr = xpath + (f'[@{key}]' if val is None else f"[@{key}='{val}']")
     return node.find(expr)
 
-# On python2.6 the xml.etree.ElementTree.Element methods don't support
-# the namespace parameter
-
 
 def xpath_with_ns(path, ns_map):
+    """Expand namespace-prefixed names to Clark notation."""
     components = [c.split(':') for c in path.split('/')]
     replaced = []
     for c in components:
@@ -876,7 +874,7 @@ class Popen(subprocess.Popen):
 
         self.__text_mode = kwargs.get('encoding') or kwargs.get('errors') or text or kwargs.get('universal_newlines')
         if text is True:
-            kwargs['universal_newlines'] = True  # For 3.6 compatibility
+            kwargs['text'] = True
             kwargs.setdefault('encoding', 'utf-8')
             kwargs.setdefault('errors', 'replace')
 
@@ -1012,7 +1010,7 @@ class ExtractorError(YoutubeDLError):
     def format_traceback(self):
         return join_nonempty(
             self.traceback and ''.join(traceback.format_tb(self.traceback)),
-            self.cause and ''.join(traceback.format_exception(None, self.cause, self.cause.__traceback__)[1:]),
+            self.cause and ''.join(traceback.format_exception(self.cause)[1:]),
             delim='\n') or None
 
     def __setattr__(self, name, value):
@@ -1960,11 +1958,7 @@ def setproctitle(title):
         libc = ctypes.cdll.LoadLibrary('libc.so.6')
     except OSError:
         return
-    except TypeError:
-        # LoadLibrary in Windows Python 2.7.13 only expects
-        # a bytestring, but since unicode_literals turns
-        # every string into a unicode string, it fails.
-        return
+
     title_bytes = title.encode()
     buf = ctypes.create_string_buffer(len(title_bytes))
     buf.value = title_bytes
@@ -2655,11 +2649,10 @@ def multipart_encode(data, boundary=None):
     Encode a dict to RFC 7578-compliant form-data
 
     data:
-        A dict where keys and values can be either Unicode or bytes-like
-        objects.
+        A dict where keys and values can be either str or bytes-like objects.
     boundary:
-        If specified a Unicode object, it's used as the boundary. Otherwise
-        a random boundary is generated.
+        An ASCII string to use as the boundary. If omitted, a random boundary
+        is generated.
 
     Reference: https://tools.ietf.org/html/rfc7578
     """
@@ -3422,7 +3415,7 @@ def ass_subtitles_timecode(seconds):
 def dfxp2srt(dfxp_data):
     """
     @param dfxp_data A bytes-like object containing DFXP data
-    @returns A unicode object containing converted SRT data
+    @returns A string containing the converted SRT data
     """
     LEGACY_NAMESPACES = (
         (b'http://www.w3.org/ns/ttml', [