Fix: Formateo PEP8 (79 cols) y limpieza flake8 en paquete facho

- Líneas >79 cols reajustadas en todo el paquete
- Fix F821: etree.cleanup_namespaces(security) en signature.py (era 'header', NameError)
- Fix bug cune_xpath -> xpath en nomina/informacion_general() (NameError)
- Elimina clase TaxScheme duplicada en form/__init__.py
- Imports explícitos (F403/F405) y __all__ en form_xml/invoice.py, nomina
- Elimina imports y variables muertas (F401/F841), E712 (== None -> is None)

facho/fe/client/dian.py

@@ -1,23 +1,13 @@
-from facho import facho
 
 import zeep
 from zeep.wsse.username import UsernameToken
-from .wsse.signature import Signature, BinarySignature
-from zeep.wsa import WsAddressingPlugin
+from .wsse.signature import BinarySignature
 import xmlsec
-import urllib.request
-from datetime import datetime
-from dataclasses import dataclass, asdict, field
-
-import http.client
-import hashlib
-import secrets
-import base64
+from dataclasses import dataclass, asdict
 
 
-__all__ = ['DianClient',
-           'ConsultaResolucionesFacturacionPeticion',
-           'ConsultaResolucionesFacturacionRespuesta']
+__all__ = ['DianClient']
+
 
 class SOAPService:
 
@@ -33,6 +23,7 @@ class SOAPService:
     def todict(self):
         return asdict(self)
 
+
 @dataclass
 class GetNumberingRangeResponse:
 
@@ -49,7 +40,6 @@ class GetNumberingRangeResponse:
 
     NumberRangeResponse: list[NumberRangeResponse]
 
-
     @classmethod
     def fromdict(cls, data):
         return cls(
@@ -100,6 +90,7 @@ class SendTestSetAsyncResponse:
             data['ErrorMessageList'] or []
         )
 
+
 @dataclass
 class SendTestSetAsync(SOAPService):
     fileName: str
@@ -115,6 +106,7 @@ class SendTestSetAsync(SOAPService):
     def build_response(self, as_dict):
         return SendTestSetAsyncResponse.fromdict(as_dict)
 
+
 @dataclass
 class SendBillSync(SOAPService):
     fileName: str
@@ -129,6 +121,7 @@ class SendBillSync(SOAPService):
     def build_response(self, as_dict):
         return as_dict
 
+
 @dataclass
 class GetStatusResponse:
     IsValid: bool
@@ -142,12 +135,12 @@ class GetStatusResponse:
             error_message = data['ErrorMessage']['string']
         else:
             error_message = None
-            
+
         return cls(data['IsValid'],
                    data['StatusDescription'],
                    data['StatusCode'],
                    error_message)
-                   
+
 
 @dataclass
 class GetStatus(SOAPService):
@@ -162,6 +155,7 @@ class GetStatus(SOAPService):
     def build_response(self, as_dict):
         return GetStatusResponse.fromdict(as_dict)
 
+
 @dataclass
 class GetStatusZip(SOAPService):
     trackId: bytes
@@ -175,6 +169,7 @@ class GetStatusZip(SOAPService):
     def build_response(self, as_dict):
         return GetStatusResponse.fromdict(as_dict[0])
 
+
 @dataclass
 class SendNominaSync(SOAPService):
     contentFile: bytes
@@ -188,7 +183,7 @@ class SendNominaSync(SOAPService):
     def build_response(self, as_dict):
         return as_dict
 
-    
+
 class Habilitacion:
     WSDL = 'https://vpfe-hab.dian.gov.co/WcfDianCustomerServices.svc?wsdl'
 
@@ -220,6 +215,7 @@ class Habilitacion:
         def get_wsdl(self):
             return Habilitacion.WSDL
 
+
 class DianGateway:
 
     def _open(self, service):
@@ -250,7 +246,11 @@ class DianClient(DianGateway):
         self._password = password
 
     def _open(self, service):
-        return zeep.Client(service.get_wsdl(), wsse=UsernameToken(self._username, self._password))
+        return zeep.Client(
+            service.get_wsdl(),
+            wsse=UsernameToken(
+                self._username,
+                self._password))
 
 
 class DianSignatureClient(DianGateway):
@@ -262,13 +262,10 @@ class DianSignatureClient(DianGateway):
 
     def _open(self, service):
         # RESOLUCCION 0004: pagina 756
-        from zeep.wsse import utils
 
-        client = zeep.Client(service.get_wsdl(), wsse=
-                             BinarySignature(
-                                 self.private_key_path, self.public_key_path, self.password,
-                                 signature_method=xmlsec.Transform.RSA_SHA256,
-                                 digest_method=xmlsec.Transform.SHA256)
-                             ,
+        client = zeep.Client(service.get_wsdl(), wsse=BinarySignature(
+            self.private_key_path, self.public_key_path, self.password,
+            signature_method=xmlsec.Transform.RSA_SHA256,
+            digest_method=xmlsec.Transform.SHA256),
         )
         return client