color version - PET: Python Entre Todos - Python Argentina

es = wsfe.aut(client, token, sign,
CUIT=20234567393, tipo_cbte=1, punto_vta=1,
cbt_desde=1, cbt_hasta=1,
tipo_doc=80, nro_doc=23111111113,
imp_total=121, imp_neto=100, impto_liq=21)
print res['cae'], res['motivo']
If everything went well, this will return the CAE (Electronic Authorization Code in
Spanish), needed to make the electronic bill.
That would be all for webservices in Python. For generation of the bill (for example in
PDF), email delivery and such, see PyRece below.
Legacy languages
Beyond the applications in Python, this library is compatible with languages such as
Visual Basic, ASP, Fox Pro, Cobol, Delphi, Genexus, PowerBuilder, PHP, .Net, Java, ABAP
(SAP), etc. and with any language/application capable of creating Component Object
Model (http://en.wikipedia.org/wiki/Component_Object_Model) in Windows (for example
Excel or Access).
This is easily accomplished using PythonCOM (part of the win32 extensions), wrapping a
common class of python to be exposed to other applications, defining the methods and
public attributes, the exposed name and other, for example:
class WSAA:
"Interface to the WebService of Authentication and Authorization"
_public_methods_ = ['CreateTRA', 'SignTRA', 'CallWSAA']
_public_attrs_ = ['Token', 'Sign', 'Version', 'XmlResponse']
_readonly_attrs_ = _public_attrs_
_reg_progid_ = "WSAA"
_reg_clsid_ = "{6268820C-8900-4AE9-8A2D-F0A1EBD4CAC5}"
Once the interface is registered, it can be called from any other application with this
technology, for example, in Visual Basic it would be:
Set WSFE = CreateObject("WSFE")
WSFE.Token = WSAA.Token ' set token and sign of wsaa
WSFE.Sign = WSAA.Sign
WSFE.Cuit = "3000000000" ' issuer CUIT
ok = WSFE.Conectar(url)
cae = WSFE.Aut(id, presta_serv, tipo_doc, ...
imp_tot_conc, imp_neto, impto_liq, ...)
In our case this was very useful and made possible to many applications contemplate
these new features (webservices, encryption, etc.) with minor modifications, which
otherwise would have been difficult or even impossible.
Text Files and Command Line
Even though the COM interface is very useful for relatively modern applications, there
are still very difficult to access languages or environments, where practically the only
way of interoperatibility are text files.
Languages as Cobol handle files with fields of fixed length (this was already supported by
the RECE of SIAP app), we went down that road, which with Python was quite
straightforward.
The interface includes tools like RECE.PY and RECEX.PY which receive and process
input files by command line, saving results in output files. This behavior es controlled by
a configuration file (RECE.INI) which defines URLs, certificates and paths to use.
PyRece: free SIAP
The history doesn’t end here, some difficulties of the RECE Application or the online
services to make electronic bills (limited functionality, delays or complexities, etc.,
especially for the contributors that do not posess management system) have been seen,
we developed a visual application (“desktop”) to facilitate and extend the possibilities
brought by AFIP:
Set WSAA = CreateObject("WSAA")
tra = WSAA.CreateTRA()
cms = WSAA.SignTRA(tra, "homo.crt", "homo.key")
ta = WSAA.CallWSAA(cms, url)