Return immediately in some cases instead of using the result list

I like it better now, but I still dislike it; We need to rewrite the entire function

stdplugins/info.py

@@ -10,7 +10,7 @@ from telethon.tl.types import MessageEntityPre
 from telethon.tl.tlobject import TLObject
 import datetime
 
-PRINTABLE_SET = set(bytes(string.printable, 'ascii'))
+PRINTABLE_SET = set(string.printable.encode())
 STR_LEN_MAX = 256
 BYTE_LEN_MAX = 64
 
@@ -19,7 +19,7 @@ def parse_pre(text):
     text = text.strip()
     return (
         text,
-        [MessageEntityPre(offset=0, length=len(add_surrogate(text)), language='potato')]
+        [MessageEntityPre(offset=0, length=len(add_surrogate(text)), language='')]
     )
 
 
@@ -33,8 +33,9 @@ def yaml_format(obj, indent=0):
         obj = obj.to_dict()
 
     if isinstance(obj, dict):
+        if not obj:
+            return 'dict:'
         result.append(obj.get('_', 'dict') + ':')
-        if obj:
         items = obj.items()
         has_multiple_items = len(items) > 2
         if has_multiple_items:
@@ -54,34 +55,32 @@ def yaml_format(obj, indent=0):
         result.append(' ' * indent)
     elif isinstance(obj, str):
         # truncate long strings and display elipsis
-        result.append(repr(obj[:STR_LEN_MAX]))
+        result = repr(obj[:STR_LEN_MAX])
         if len(obj) > STR_LEN_MAX:
-            result.append('…')
+            result += '…'
+        return result
     elif isinstance(obj, bytes):
         # repr() bytes if it's printable, hex like "FF EE BB" otherwise
         if all(c in PRINTABLE_SET for c in obj):
-            result.append(repr(obj))
+            return repr(obj)
         else:
-            if len(obj) > BYTE_LEN_MAX:
+            return ('<…>' if len(obj) > BYTE_LEN_MAX else
-                result.append('<…>')
+                    ' '.join(f'{b:02X}' for b in obj))
-            else:
-                result.append(' '.join(f'{b:02X}' for b in obj))
     elif isinstance(obj, datetime.datetime):
         # ISO-8601 without timezone offset (telethon dates are always UTC)
-        result.append(obj.strftime('%Y-%m-%d %H:%M:%S'))
+        return obj.strftime('%Y-%m-%d %H:%M:%S')
     elif hasattr(obj, '__iter__'):
         # display iterables one after another at the base indentation level
         result.append('\n')
         indent += 2
         for x in obj:
-            result.append(' ' * indent)
+            result.append(f"{' ' * indent}- {yaml_format(x, indent + 2)}")
-            result.append(yaml_format(x, indent))
             result.append('\n')
         result.pop()
         indent -= 2
         result.append(' ' * indent)
     else:
-        result.append(repr(obj))
+        return repr(obj)
 
     return ''.join(result)