Avoid respecifying default encoding for .encode()/.decode() calls

In Python 3, both .encode() and .decode() default the encoding to
'utf-8'. See the docs:

https://docs.python.org/3/library/stdtypes.html#str.encode
https://docs.python.org/3/library/stdtypes.html#bytes.decode

Simplify and shorten the code by using the default instead of
respecifying it.

1 files changed, 1 insertions, 1 deletions

diff --git a/sphinx/pycode/parser.py b/sphinx/pycode/parser.py
index 71d7df781..0d0c3322f 100644
--- a/sphinx/pycode/parser.py
+++ b/sphinx/pycode/parser.py
@@ -480,7 +480,7 @@ class Parser:
     def parse_comments(self):
         # type: () -> None
         """Parse the code and pick up comments."""
-        tree = ast.parse(self.code.encode('utf-8'))
+        tree = ast.parse(self.code.encode())
         picker = VariableCommentPicker(self.code.splitlines(True), self.encoding)
         picker.visit(tree)
         self.comments = picker.comments