Issue #16819: IDLE method completion now correctly works for bytes literals.

Lib/idlelib/HyperParser.py

@@ -232,6 +232,11 @@ class HyperParser:
                     pass
                 else:
                     # We can't continue after other types of brackets
+                    if rawtext[pos] in "'\"":
+                        # Scan a string prefix
+                        while pos > 0 and rawtext[pos - 1] in "rRbBuU":
+                            pos -= 1
+                        last_identifier_pos = pos
                     break
 
             else:

Misc/NEWS

@@ -124,6 +124,8 @@ Core and Builtins
 Library
 -------
 
+- Issue #16819: IDLE method completion now correctly works for bytes literals.
+
 - Issue #9586: Redefine SEM_FAILED on MacOSX to keep compiler happy.
 
 - Issue 10527: make multiprocessing use poll() instead of select() if available.