I have searched that there is "action_invoice_create" method to create invoice from SO in OLD version odoo. 
Can I do it in odoo13?
The old style code like that
o_so_id = 3   #sale order id
o_invoice = models.execute_kw(odoo_config['db'],
                               odoo_config['uid'],
                               odoo_config['password'],
                               'sale.order',
                               'action_invoice_create',
                               [[3]], {'context': {'active_ids': 3}})

But it generate error in odoo 13
​xmlrpc.client.Fault: <Fault 1: 'Traceback (most recent call last):\n  File "/opt/odoo13/odoo/odoo/addons/base/controllers/rpc.py", line 63, in xmlrpc_2\n    response = self._xmlrpc(service)\n  File "/opt/odoo13/odoo/odoo/addons/base/controllers/rpc.py", line 43, in _xmlrpc\n    result = dispatch_rpc(service, method, params)\n  File "/opt/odoo13/odoo/odoo/http.py", line 138, in dispatch_rpc\n    result = dispatch(method, params)\n  File "/opt/odoo13/odoo/odoo/service/model.py", line 40, in dispatch\n    res = fn(db, uid, *params)\n  File "/opt/odoo13/odoo/odoo/service/model.py", line 168, in execute_kw\n    return execute(db, uid, obj, method, *args, **kw or {})\n  File "/opt/odoo13/odoo/odoo/service/model.py", line 93, in wrapper\n    return f(dbname, *args, **kwargs)\n  File "/opt/odoo13/odoo/odoo/service/model.py", line 175, in execute\n    res = execute_cr(cr, uid, obj, method, *args, **kw)\n  File "/opt/odoo13/odoo/odoo/service/model.py", line 164, in execute_cr\n    return odoo.api.call_kw(recs, method, args, kw)\n  File "/opt/odoo13/odoo/odoo/api.py", line 388, in call_kw\n    method = getattr(type(model), name)\nAttributeError: type object \'sale.order\' has no attribute \'action_invoice_create\'\n'>