'Base module supporting qweb template functions (provides basic
imports and utilities), returned as a Python AST.
Currently provides:
* collections
* itertools
Define:
* escape
* unicodifier (empty string for a None or False, otherwise unicode string)'

def _base_module(self):

    return ast.parse(dedent('\n                                                from    collections    import    OrderedDict\n                                                from    odoo.addons.base.ir.ir_qweb.qweb    import    escape,    unicodifier,    foreach_iterator\n                                                '))
