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RuntimeError: TypeError: locals is undefined #2461

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moepnse opened this issue Jun 23, 2024 · 0 comments
Open

RuntimeError: TypeError: locals is undefined #2461

moepnse opened this issue Jun 23, 2024 · 0 comments

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@moepnse
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moepnse commented Jun 23, 2024 •
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Hi!

I'm not sure if this is related to the shadow DOM migration I'm currently doing or just a coincidence, but I will find out.

I am currently trying to reproduce the problem in a simplified issue demo. Unfortunately still without success. But maybe this informations will be enough for you and help you to find the bug.
I'm pretty sure I should get a Python exception and not a RuntimeError.

If I find something useful I'll let you know.

Thanks in advance.

Traceback (most recent call last):
  File "?brython-version=snapshot", line 18, in onopen
    import elephas
  File "VFS.elephas/__init__.py", line 73, in <module>
    from. import ui
  File "VFS.elephas.ui/__init__.py", line 6, in <module>
    from. import splash
  File "VFS.elephas.ui.uiplugins.py", line 44, in <module>
    browser.aio.run(load_ui_plugins())
RuntimeError: TypeError: locals is undefined

I think only the first few lines of the JavaScript code are of interest.

// Javascript code generated from ast
var $B = __BRYTHON__,
    _b_ = $B.builtins,
    locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354 = $B.imported["webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354"],
    locals = locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354,
    frame = ["webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354", locals, "webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354", locals]
var __file__ = frame.__file__ = 'stermi/web_workers/formatter.py'
locals.__name__ = 'webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354'
locals.__doc__ = _b_.None
locals.__annotations__ = locals.__annotations__ || $B.empty_dict()
frame.$f_trace = $B.enter_frame(frame)
$B.set_lineno(frame, 1)

var _frame_obj = $B.frame_obj
var stack_length = $B.count_frames()
try{
  $B.set_lineno(frame, 4)
  var module = $B.$import_from("collections", ["deque"], {}, 0, locals);
  $B.set_lineno(frame, 6)
  var module = $B.$import_from("sys", ["argv"], {}, 0, locals);
  $B.set_lineno(frame, 7)
  var module = $B.$import_from("os", ["environ"], {}, 0, locals);
  $B.set_lineno(frame, 8)
  $B.$import("html", [], {}, locals, true)
  $B.set_lineno(frame, 10)
  var module = $B.$import_from("browser", ["bind", "self", "console"], {}, 0, locals);
  $B.set_lineno(frame, 11)
  $B.$import("json", [], {}, locals, true)
  $B.set_lineno(frame, 18);
  $B.$call($B.$getattr_pep657(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354.console, 'debug', [0,0,13]), [0,0,42])('started format web worker')
  $B.set_lineno(frame, 21)
  function format532751527348713(){
    var locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format,
        locals
    locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format = locals = format532751527348713.$args_parser(format532751527348713, arguments)
    var frame = ["format", locals, "webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354", locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354, format532751527348713]
    if(locals.$has_generators){
      frame.$has_generators = true
    }
    frame.__file__ = __file__
    frame.$lineno = 21
    frame.$f_trace = $B.enter_frame(frame)
    try{
      $B.js_this = this
      $B.set_lineno(frame, 22)
      locals.__annotations__ = locals.__annotations__ || $B.empty_dict()
      var ann = $B.$list(['%', '{'])
      locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.start_tokens = ann
      $B.set_lineno(frame, 23)
      var ann = $B.$list(['%', '}'])
      locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.end_tokens = ann
      $B.set_lineno(frame, 24)
      locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.stack = $B.$call(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354.deque, [12,12,24])($B.$list([]), 2)
      $B.set_lineno(frame, 25)
      var ann = $B.$call($B.$getattr_pep657('', 'join', [30,30,37]), [30,30,51])(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.start_tokens)
      locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.start_tokens_chars = ann
      $B.set_lineno(frame, 26)
      var ann = $B.$call($B.$getattr_pep657('', 'join', [28,28,35]), [28,28,47])(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.end_tokens)
      locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.end_tokens_chars = ann
      $B.set_lineno(frame, 27)
      var ann = false
      locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.start_token_found = ann
      $B.set_lineno(frame, 28)
      var ann = false
      locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.end_token_found = ann
      $B.set_lineno(frame, 29)
      var ann = ''
      locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.var_name = ann
      $B.set_lineno(frame, 30)
      var ann = 'abcdefghijklmnopqrstuvwxyz1234567890_'
      locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.allowed_chars = ann
      $B.set_lineno(frame, 31)
      var ann = ''
      locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.last_char = ann
      $B.set_lineno(frame, 32)
      var ann = ''
      locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.start_token = ann
      $B.set_lineno(frame, 33)
      var ann = ''
      locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.end_token = ann
      $B.set_lineno(frame, 34)
      var ann = ''
      locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.new_string = ann
      frame.$lineno = 35
      var no_break_532751527348714 = true,
          iterator_532751527348714 = locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.string
      for(var next_532751527348714 of $B.make_js_iterator(iterator_532751527348714, frame, 35)){
        locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.c = next_532751527348714
        if($B.set_lineno(frame, 36) && ($B.$bool((! $B.$bool(locals.$test = ! $B.$bool(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.start_token_found)) ? locals.$test : $B.$is_member(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.c, locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.start_tokens_chars))) || $B.$bool((! $B.$bool(locals.$test = (! $B.$bool(locals.$test = locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.start_token_found) ? locals.$test : $B.$is_member(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.c, locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.end_tokens_chars))) ? locals.$test : $B.rich_comp('__ne__', locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.last_char, '\\'))))){
          $B.set_lineno(frame, 37);
          $B.$call($B.$getattr_pep657(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.stack, 'append', [12,12,24]), [12,12,27])(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.c)
        }else{
          $B.set_lineno(frame, 39);
          $B.$call($B.$getattr_pep657(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.stack, 'append', [12,12,24]), [12,12,29])(' ')
        }
        $B.set_lineno(frame, 40)
        locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.token = $B.$call($B.$getattr_pep657('', 'join', [16,16,23]), [16,16,30])(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.stack)
        if($B.set_lineno(frame, 41) && $B.$bool(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.start_token_found)){
          frame.$lineno = 42
          var no_break_532751527348715 = true,
              iterator_532751527348715 = $B.fast_tuple([locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.c, locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.token])
          for(var next_532751527348715 of $B.make_js_iterator(iterator_532751527348715, frame, 42)){
            locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.t = next_532751527348715
            if($B.set_lineno(frame, 43) && $B.$bool($B.$is_member(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.t, locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.end_tokens))){
              if($B.set_lineno(frame, 44) && $B.$bool($B.rich_comp('__eq__', $B.$call($B.$getattr_pep657(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.start_tokens, 'index', [23,23,41]), [23,23,54])(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.start_token), $B.$call($B.$getattr_pep657(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.end_tokens, 'index', [58,58,74]), [58,58,77])(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.t)))){
                $B.set_lineno(frame, 45)
                locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.end_token = locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.t
                $B.set_lineno(frame, 46)
                locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.value = $B.$call($B.$getattr_pep657(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.data, 'get', [32,32,40]), [32,32,89])(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.var_name, _b_.str.$factory(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.start_token) + _b_.str.$factory(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.var_name) + _b_.str.$factory(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.end_token))
                if($B.set_lineno(frame, 47) && $B.$bool($B.$call(_b_.isinstance, [27,27,58])(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.value, $B.fast_tuple([_b_.list, _b_.dict])))){
                  $B.set_lineno(frame, 48)
                  locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.value = $B.$call($B.$getattr_pep657(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354.json, 'dumps', [36,36,46]), [36,36,53])(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.value)
                }else{
                  $B.set_lineno(frame, 50)
                  locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.value = $B.$call(_b_.str, [36,36,46])(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.value)
                }
                $B.set_lineno(frame, 51)
                locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.new_string = $B.augm_assign(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.new_string, '+=', $B.$call($B.$getattr_pep657(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354.html, 'escape', [38,38,49]), [38,38,56])(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.value))
                $B.set_lineno(frame, 52)
                locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.start_token_found = false
                $B.set_lineno(frame, 53)
                locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.end_token_found = true
                $B.set_lineno(frame, 54)
                locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.var_name = ''
                no_break_532751527348715 = false
                break
              }else{
                $B.set_lineno(frame, 57);
                $B.$call(_b_.print, [24,24,70])('end token does not match start token!')
                $B.set_lineno(frame, 58)
                locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.start_token_found = false
                $B.set_lineno(frame, 59)
                locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.new_string = $B.augm_assign(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.new_string, '+=', $B.rich_op('__add__', $B.rich_op('__add__', locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.start_token, locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.var_name, [38,38,60,60]), locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.c, [38,38,64,64]))
                $B.set_lineno(frame, 60)
                locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.var_name = ''
              }
            }
          }
          if(no_break_532751527348715){
            if($B.set_lineno(frame, 62) && $B.$bool($B.$is_member(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.c, locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.end_tokens_chars))){
              $B.set_lineno(frame, 63)
              locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.last_char = locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.c
              continue
            }
            if($B.set_lineno(frame, 65) && $B.$bool($B.$is_member(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.c, locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.allowed_chars))){
              $B.set_lineno(frame, 66)
              locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.var_name = $B.augm_assign(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.var_name, '+=', locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.c)
              continue
            }else{
              $B.set_lineno(frame, 69)
              locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.start_token_found = false
              $B.set_lineno(frame, 70);
              $B.$call(_b_.print, [20,20,67])(_b_.str.$factory(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.c) + ' is not allowed inside placeholder')
              $B.set_lineno(frame, 71)
              locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.new_string = $B.augm_assign(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.new_string, '+=', $B.rich_op('__add__', $B.rich_op('__add__', locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.start_token, locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.var_name, [34,34,56,56]), locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.c, [34,34,60,60]))
              $B.set_lineno(frame, 72)
              locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.var_name = ''
            }
            continue
          }
          
          if($B.set_lineno(frame, 74) && $B.$bool(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.end_token_found)){
            $B.set_lineno(frame, 75)
            locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.last_char = locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.c
            $B.set_lineno(frame, 76)
            locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.end_token_found = false
            continue
          }
        }
        if($B.set_lineno(frame, 78) && $B.$bool(! $B.$bool(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.start_token_found))){
          frame.$lineno = 79
          var no_break_532751527348721 = true,
              iterator_532751527348721 = $B.fast_tuple([locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.c, locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.token])
          for(var next_532751527348721 of $B.make_js_iterator(iterator_532751527348721, frame, 79)){
            locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.t = next_532751527348721
            if($B.set_lineno(frame, 80) && $B.$bool($B.$is_member(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.t, locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.start_tokens))){
              $B.set_lineno(frame, 81)
              locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.start_token_found = true
              $B.set_lineno(frame, 82)
              locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.start_token = locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.t
              no_break_532751527348721 = false
              break
            }
          }
        }
        if($B.set_lineno(frame, 84) && ($B.$bool((! $B.$bool(locals.$test = ! $B.$is_member(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.c, locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.start_tokens_chars)) ? locals.$test : ! $B.$bool((! $B.$bool(locals.$test = locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.start_token_found) ? locals.$test : $B.$is_member(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.c, locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.end_tokens_chars))))) || $B.$bool($B.rich_comp('__eq__', locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.last_char, '\\')))){
          $B.set_lineno(frame, 85)
          locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.new_string = $B.augm_assign(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.new_string, '+=', locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.c)
        }
        $B.set_lineno(frame, 86)
        locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.last_char = locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.c
      }
      $B.set_lineno(frame, 87)
      var result = locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format.new_string
      $B.trace_return_and_leave(frame, result)
      return result
    }catch(err){
      $B.set_exc_and_leave(frame, err)
      throw err
    }
  }
  $B.make_function_infos(format532751527348713, 'webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354', $B.fast_tuple([]), _b_.None, _b_.None, ['string','data'], null, null,
  2, __file__, 21, 3, [], 0, 'format', 19, 0, 'format', ['string','data','start_tokens','end_tokens','stack','start_tokens_chars','end_tokens_chars','start_token_found','end_token_found','var_name','allowed_chars','last_char','start_token','end_token','new_string','c','token','t','value'])
  format532751527348713.$args_parser = $B.make_args_parser_and_parse
  locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354.format = format532751527348713
  locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354.format.__annotations__ = _b_.dict.$factory([['string', _b_.str]])
  
  $B.set_lineno(frame, 90)
  function format_web532751527348722(){
    var locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web,
        locals
    locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web = locals = format_web532751527348722.$args_parser(format_web532751527348722, arguments)
    var frame = ["format_web", locals, "webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354", locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354, format_web532751527348722]
    if(locals.$has_generators){
      frame.$has_generators = true
    }
    frame.__file__ = __file__
    frame.$lineno = 90
    frame.$f_trace = $B.enter_frame(frame)
    try{
      $B.js_this = this
      $B.set_lineno(frame, 91)
      locals.__annotations__ = locals.__annotations__ || $B.empty_dict()
      var ann = false
      locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.start_token_found = ann
      $B.set_lineno(frame, 92)
      var ann = ''
      locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.var_name = ann
      $B.set_lineno(frame, 93)
      var ann = 'abcdefghijklmnopqrstuvwxyz1234567890_'
      locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.allowed_chars = ann
      $B.set_lineno(frame, 94)
      var ann = ''
      locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.last_char = ann
      $B.set_lineno(frame, 95)
      var ann = '%'
      locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.start_token = ann
      $B.set_lineno(frame, 96)
      var ann = '%'
      locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.end_token = ann
      $B.set_lineno(frame, 97)
      var ann = ''
      locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.new_string = ann
      frame.$lineno = 98
      var no_break_532751527348723 = true,
          iterator_532751527348723 = locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.string
      for(var next_532751527348723 of $B.make_js_iterator(iterator_532751527348723, frame, 98)){
        locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.c = next_532751527348723
        if($B.set_lineno(frame, 99) && $B.$bool(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.start_token_found)){
          if($B.set_lineno(frame, 100) && $B.$bool($B.rich_comp('__eq__', locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.c, locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.end_token))){
            $B.set_lineno(frame, 101)
            locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.value = $B.$call($B.$getattr_pep657(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.data, 'get', [24,24,32]), [24,24,81])(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.var_name, _b_.str.$factory(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.start_token) + _b_.str.$factory(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.var_name) + _b_.str.$factory(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.end_token))
            if($B.set_lineno(frame, 102) && $B.$bool($B.$call(_b_.isinstance, [19,19,50])(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.value, $B.fast_tuple([_b_.list, _b_.dict])))){
              $B.set_lineno(frame, 103)
              locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.value = $B.$call($B.$getattr_pep657(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354.json, 'dumps', [29,29,39]), [29,29,46])(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.value)
            }else{
              $B.set_lineno(frame, 105)
              locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.value = $B.$call(_b_.str, [28,28,38])(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.value)
            }
            $B.set_lineno(frame, 106)
            locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.new_string = $B.augm_assign(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.new_string, '+=', $B.$call($B.$getattr_pep657(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354.html, 'escape', [30,30,41]), [30,30,48])(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.value))
            $B.set_lineno(frame, 107)
            locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.start_token_found = false
            $B.set_lineno(frame, 108)
            locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.var_name = ''
            $B.set_lineno(frame, 109)
            locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.last_char = locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.c
            continue
          }else{
            if($B.set_lineno(frame, 112) && $B.$bool($B.$is_member(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.c, locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.allowed_chars))){
              $B.set_lineno(frame, 113)
              locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.var_name = $B.augm_assign(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.var_name, '+=', locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.c)
              continue
            }else{
              $B.set_lineno(frame, 116)
              locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.start_token_found = false
              $B.set_lineno(frame, 117);
              $B.$call(_b_.print, [20,20,67])(_b_.str.$factory(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.c) + ' is not allowed inside placeholder')
              $B.set_lineno(frame, 118)
              locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.new_string = $B.augm_assign(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.new_string, '+=', $B.rich_op('__add__', $B.rich_op('__add__', locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.start_token, locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.var_name, [34,34,56,56]), locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.c, [34,34,60,60]))
              $B.set_lineno(frame, 119)
              locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.var_name = ''
            }
            continue
          }
        }else if($B.set_lineno(frame, 122) && ($B.$bool($B.rich_comp('__ne__', locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.last_char, '\\')) && $B.$bool($B.rich_comp('__eq__', locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.c, locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.start_token)))){
          $B.set_lineno(frame, 123)
          locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.start_token_found = true
          $B.set_lineno(frame, 124)
          locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.last_char = locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.c
          continue
        }
        if($B.set_lineno(frame, 126) && ($B.$bool((! $B.$bool(locals.$test = $B.rich_comp('__ne__', locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.c, locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.start_token)) ? locals.$test : ! $B.$bool((! $B.$bool(locals.$test = locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.start_token_found) ? locals.$test : $B.rich_comp('__eq__', locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.c, locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.end_token))))) || $B.$bool($B.rich_comp('__eq__', locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.last_char, '\\')))){
          $B.set_lineno(frame, 127)
          locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.new_string = $B.augm_assign(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.new_string, '+=', locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.c)
        }
        $B.set_lineno(frame, 128)
        locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.last_char = locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.c
      }
      $B.set_lineno(frame, 129)
      var result = locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_format_web.new_string
      $B.trace_return_and_leave(frame, result)
      return result
    }catch(err){
      $B.set_exc_and_leave(frame, err)
      throw err
    }
  }
  $B.make_function_infos(format_web532751527348722, 'webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354', $B.fast_tuple([]), _b_.None, _b_.None, ['string','data'], null, null,
  2, __file__, 90, 3, [], 0, 'format_web', 11, 0, 'format_web', ['string','data','start_token_found','var_name','allowed_chars','last_char','start_token','end_token','new_string','c','value'])
  format_web532751527348722.$args_parser = $B.make_args_parser_and_parse
  locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354.format_web = format_web532751527348722
  locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354.format_web.__annotations__ = _b_.dict.$factory([['string', _b_.str]])
  
  // declare decorators
  $B.set_lineno(frame, 133)
  var decorator532751527348727 = $B.$call(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354.bind, [1,1,22])(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354.self, 'message')
  $B.set_lineno(frame, 134)
  function message532751527348728(){
    var locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_message,
        locals
    locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_message = locals = message532751527348728.$args_parser(message532751527348728, arguments)
    var frame = ["message", locals, "webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354", locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354, message532751527348728]
    if(locals.$has_generators){
      frame.$has_generators = true
    }
    frame.__file__ = __file__
    frame.$lineno = 134
    frame.$f_trace = $B.enter_frame(frame)
    try{
      $B.js_this = this
      $B.set_lineno(frame, 139);
      $B.$call($B.$getattr_pep657(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354.console, 'debug', [4,4,17]), [4,4,31])('format_web')
      $B.set_lineno(frame, 140);
      $B.$call($B.$getattr_pep657(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354.self, 'send', [4,4,13]), [4,4,51])($B.$call(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354.format_web, [14,14,50])($B.$getitem($B.$getattr_pep657(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_message.evt, 'data', [25,25,33]), 0,[25,34,35]), $B.$getitem($B.$getattr_pep657(locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354_message.evt, 'data', [38,38,46]), 1,[38,47,48])))
      var result = _b_.None
      $B.trace_return_and_leave(frame, result)
      return result
    }catch(err){
      $B.set_exc_and_leave(frame, err)
      throw err
    }
  }
  $B.make_function_infos(message532751527348728, 'webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354', $B.fast_tuple([]), _b_.None, 'Handle a message sent by the main script.\n\
    evt.data is the message body.\n\
    ', ['evt'], null, null,
  1, __file__, 134, 3, [], 0, 'message', 1, 0, 'message', ['evt'])
  message532751527348728.$args_parser = $B.make_args_parser_and_parse
  var decorated532751527348729 = message532751527348728
  decorated532751527348729.__annotations__ = $B.empty_dict()
  locals_webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354.message = $B.$call(decorator532751527348727)(decorated532751527348729)
  $B.leave_frame({locals, value: _b_.None})
}catch(err){
  $B.set_exc_and_trace(frame, err)
  $B.leave_frame({locals, value: _b_.None})
  throw err
}
brython.js:968:62

It is interesting to note that $B.imported["webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354"] is undefined.

__BRYTHON__.imported["webworker_8303fa65_a44d_4bbf_994b_21dbaac4b354"]
undefined
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@moepnse