old_contents: # flake8: noqa
  from textx.metamodel import metamodel_from_file, metamodel_from_str
  from textx.model import get_children_of_type, get_parent_of_type, \
      get_model, get_metamodel, get_children
  from textx.exceptions import TextXError, TextXSyntaxError, \
      TextXSemanticError
  from textx.langapi import get_language, iter_languages
  from textx.scoping.tools import textx_isinstance
  
  __version__ = "1.8.0"
  
new_contents: # flake8: noqa
  from textx.metamodel import metamodel_from_file, metamodel_from_str
  from textx.model import get_children_of_type, get_parent_of_type, \
      get_model, get_metamodel, get_children
  from textx.exceptions import TextXError, TextXSyntaxError, \
      TextXSemanticError
  from textx.langapi import get_language, iter_languages
  from textx.scoping.tools import textx_isinstance
  
  __version__ = "2.0.0-dev"
  
subject: Change version to 2.0.0-dev