def evaluate_expression(thread_id, frame_id, expression, doExec):
    '''returns the result of the evaluated expression
    @param doExec: determines if we should do an exec or an eval
    '''
    frame = find_frame(thread_id, frame_id)
    if frame is None:
        return

    # Not using frame.f_globals because of https://sourceforge.net/tracker2/?func=detail&aid=2541355&group_id=85796&atid=577329
    # (Names not resolved in generator expression in method)
    # See message: http://mail.python.org/pipermail/python-list/2009-January/526522.html
    updated_globals = {}
    updated_globals.update(frame.f_globals)
    updated_globals.update(frame.f_locals)  # locals later because it has precedence over the actual globals

    try:
        expression = str(expression.replace('@LINE@', '\n'))

        if doExec:
            try:
                # try to make it an eval (if it is an eval we can print it, otherwise we'll exec it and
                # it will have whatever the user actually did)
                compiled = compile(expression, '<string>', 'eval')
            except:
                Exec(expression, updated_globals, frame.f_locals)
                pydevd_save_locals.save_locals(frame)
            else:
                result = eval(compiled, updated_globals, frame.f_locals)
                if result is not None:  # Only print if it's not None (as python does)
                    sys.stdout.write('%s\n' % (result,))
            return

        else:
            return eval_in_context(expression, updated_globals, frame.f_locals)
    finally:
        # Should not be kept alive if an exception happens and this frame is kept in the stack.
        del updated_globals
        del frame
returns the result of the evaluated expression
    @param doExec: determines if we should do an exec or an eval
    
debugger/src/_pydevd_bundle/pydevd_vars.py