Hi,

if I use Odoo 12 with Python 3.7.4 and PostgreSQL 9.6.15, I got this error.

Traceback (most recent call last):
  File "/home/dev/gitbase/v12/v12-server/odoo/tools/safe_eval.py", line 350, in safe_eval
    return unsafe_eval(c, globals_dict, locals_dict)
  File "", line 1, in <module>
  File "<decorator-gen-61>", line 2, in button_immediate_install
  File "/home/dev/gitbase/v12/v12-server/odoo/addons/base/models/ir_module.py", line 74, in check_and_log
    return method(self, *args, **kwargs)
  File "/home/dev/gitbase/v12/v12-server/odoo/addons/base/models/ir_module.py", line 445, in button_immediate_install
    return self._button_immediate_function(type(self).button_install)
  File "/home/dev/gitbase/v12/v12-server/odoo/addons/base/models/ir_module.py", line 561, in _button_immediate_function
    modules.registry.Registry.new(self._cr.dbname, update_module=True)
  File "/home/dev/gitbase/v12/v12-server/odoo/modules/registry.py", line 86, in new
    odoo.modules.load_modules(registry._db, force_demo, status, update_module)
  File "/home/dev/gitbase/v12/v12-server/odoo/modules/loading.py", line 421, in load_modules
    loaded_modules, update_module, models_to_check)
  File "/home/dev/gitbase/v12/v12-server/odoo/modules/loading.py", line 313, in load_marked_modules
    perform_checks=perform_checks, models_to_check=models_to_check
  File "/home/dev/gitbase/v12/v12-server/odoo/modules/loading.py", line 231, in load_module_graph
    module.with_context(overwrite=overwrite)._update_translations()
  File "/home/dev/gitbase/v12/v12-server/odoo/addons/base/models/ir_module.py", line 885, in _update_translations
    self.env['ir.translation'].load_module_terms(mod_names, filter_lang)
  File "/home/dev/gitbase/v12/v12-server/odoo/addons/base/models/ir_translation.py", line 825, in load_module_terms
    tools.trans_load(self._cr, trans_file, lang, verbose=False, module_name=module_name, context=context)
  File "/home/dev/gitbase/v12/v12-server/odoo/tools/translate.py", line 1017, in trans_load
    result = trans_load_data(cr, fileobj, fileformat, lang, verbose=verbose, module_name=module_name, context=context)
  File "/home/dev/gitbase/v12/v12-server/odoo/tools/translate.py", line 1161, in trans_load_data
    irt_cursor.finish()
  File "/home/dev/gitbase/v12/v12-server/odoo/addons/base/models/ir_translation.py", line 156, in finish
    """ % (self._model_table, self._table))
  File "/home/dev/gitbase/v12/v12-server/odoo/sql_db.py", line 148, in wrapper
    return f(self, *args, **kwargs)
  File "/home/dev/gitbase/v12/v12-server/odoo/sql_db.py", line 225, in execute
    res = self._obj.execute(query, params)
psycopg2.ProgrammingError: ON CONFLICT DO UPDATE command cannot affect row a second time
HINT:  Ensure that no rows proposed for insertion within the same command have duplicate constrained values.

With Python 3.6.8 I got no problems.

I did take care for the python libs between Python 3.6 and 3.7 like in \https://github.com/odoo/odoo/blob/12.0/requirements.txt  defined.

So my question. 

Is there an official recommendation for Odoo version with Python version and PostgreSQL version?