fix #4956 (#4958)

scripts/update_api.py

@@ -1819,25 +1819,33 @@ if _lib is None:
     print("    builtins.Z3_LIB_DIRS = [ '/path/to/libz3.%s' ] " % _ext)
   raise Z3Exception("libz3.%s not found." % _ext)
 
-def _str_to_bytes(s):
-  if isinstance(s, str):
-    try: 
-      return s.encode('latin-1')
-    except:
-      # kick the bucket down the road.  :-J
-      return s
-  else:
-    return s
+# def _str_to_bytes(s):
+#   if isinstance(s, str):
+#     try:
+#       return s.encode('latin-1')
+#     except:
+#       # kick the bucket down the road.  :-J
+#       return s
+#   else:
+#     return s
 
 if sys.version < '3':
+  def _str_to_bytes(s):
+    return s
   def _to_pystr(s):
      return s
 else:
+  def _str_to_bytes(s):
+    if isinstance(s, str):
+        enc = sys.stdout.encoding
+        return s.encode(enc if enc != None else 'latin-1')
+    else:
+      return s
+
   def _to_pystr(s):
      if s != None:
         enc = sys.stdout.encoding
-        if enc != None: return s.decode(enc)
-        else: return s.decode('latin-1')
+        return s.decode(enc if enc != None else 'latin-1')
      else:
         return ""