--- a/Generic/base.py	Sun Sep 14 17:23:02 2014 +0200
+++ b/Generic/base.py	Tue Sep 30 17:16:50 2014 +0200
@@ -3,7 +3,7 @@
 ## File base.py
 ## This file is part of pyArq-Presupuestos.
 ##
-## Copyright (C) 2010-2013 Miguel Ángel Bárcena Rodríguez
+## Copyright (C) 2010-2014 Miguel Ángel Bárcena Rodríguez
 ##                         <miguelangel@obraencurso.es>
 ##
 ## pyArq-Presupuestos is free software: you can redistribute it and/or modify
@@ -259,8 +259,8 @@
     Description:
         Record object
     Constructor:
-        base.Record(code, synonyms, hierarchy, unit, summary, prices, type,
-                    subtype, text="")
+        base.Record(decimals, code, synonyms, hierarchy, unit, summary,
+                 prices, type_, subtype, parents=None, text=None)
     Ancestry:
     +-- object
       +-- Record
@@ -333,15 +333,19 @@
         self.__labels = tuple[11]
 
     def __init__(self, decimals, code, synonyms, hierarchy, unit, summary,
-                 prices, type_, subtype, parents=[], text=""):
+                 prices, type_, subtype, parents=None, text=None):
         self.code = code
         self.synonyms = synonyms
         self.recordType = (hierarchy, type_, subtype)
         self.unit = unit
         self.summary = summary
         self.setPrices(prices, decimals)
+        if parents is None:
+            parents = []
         self.parents = parents
         self.children = []
+        if text is None:
+            text = ""
         self.text = text
         self.sheet = Sheet()
         self.files = []
@@ -543,9 +547,9 @@
         self.__children = children
 
     def appendChild(self, child_code, decimals, factor=0.0, yield_=0.0,
-                    measure=0.0, measure_list=[], type_ ="", label=""):
+                    measure=0.0, measure_list=None, type_=None, label=None):
         """appendChildren(self, child_code, factor=0.0, yield_=0.0,
-                    measure=0.0, measure_list=[], type_ ="", label=""))
+                    measure=0.0, measure_list=None, type_=None, label=None))
         
         position:
         child_code:
@@ -558,6 +562,12 @@
         
         Append a child to the list of children
         """
+        if measure_list is None:
+            measure_list = []
+        if type_ is None:
+            type_ = ""
+        if label is None:
+            label = ""
         _measure = Measure(decimals, self.recordType,
                            measure, [], label, factor, yield_)
         if len(measure_list) > 0:
@@ -719,8 +729,8 @@
     Description:
         Parametric Record object
     Constructor:
-        base.ParametricRecord(code, synonyms, hierarchy, unit, summary, prices,
-                              type_, subtype, text="")
+        base.ParametricRecord(budget, code, synonyms, hierarchy, unit, summary,
+                 prices, type_, subtype, parents=None, text=None)
     Ancestry:
     +-- object
       +-- Record
@@ -776,9 +786,13 @@
         self.__parametric_text = tuple[19]
     
     def __init__(self, budget, code, synonyms, hierarchy, unit, summary,
-                 prices, type_, subtype, parents=[], text=""):
+                 prices, type_, subtype, parents=None, text=None):
+        if parents is None:
+            parents = []
+        if text is None:
+            text = ""
         Record.__init__(self, budget, code, synonyms, hierarchy, unit, summary,
-                 prices, type_, subtype, parents=[], text="")
+                 prices, type_, subtype, parents, text)
         self.__parameters = {}
         self.__select_comment = ""
         self.__vars = {}
@@ -1105,7 +1119,7 @@
         """)
 
     def buildMeasure(self, list_lines, type_, decimals, recordType):
-        """setMeasure(self, list_lines, type_, decimals)
+        """setMeasure(list_lines, type_, decimals, recordType)
         
         list_lines: list of measure lines
             [ [linetype, comment, units, length, width, height, formula], ... ]
@@ -1950,14 +1964,18 @@
     def iter(self):
         for record in self.__records:
             yield record
-    def iterPreOrder(self, recordCode, codes=[]):
+    def iterPreOrder(self, recordCode, codes=None):
+        if codes is None:
+            codes = []
         _children = self.getchildren(recordCode)
         for _child in _children:
             if not _child in codes:
                 codes.append(_child)
                 self.iterPreOrder(_child, codes)
         return codes
-    def iterPostOrder(self, recordCode, codes=[]):
+    def iterPostOrder(self, recordCode, codes=None):
+        if codes is None:
+            codes = []
         _children = self.getchildren(recordCode)
         for _child in _children:
             if not _child in codes:
@@ -2133,7 +2151,7 @@
                             dictionary["DIRC"], dictionary["DCD"],
                             dictionary["DIVISA"])
         self.__decimals[N] = decimals
-    def getDecimals(self, decimal="All", N=None):
+    def getDecimals(self, decimal=None, N=None):
         """getDecimals(self,decimal="All",N=None)
         
         decimal:
@@ -2143,6 +2161,7 @@
         N: the price group None,1,2,..
             None: Return the active price group
         """
+        if decimal is None: decimal = "All"
         if N is None: N = self.getActiveTitle()
         if decimal == "All":
             return self.__decimals[N+1]
@@ -2172,14 +2191,16 @@
                          "IVA" : dictionary["IVA"]}
         self.__percentages = _percentages
 
-    def getPercentages(self, key="All"):
-        """getPercentages(self, percentage="All")
+    def getPercentages(self, key=None):
+        """getPercentages(self, key=None)
         
         key:
             "All": Return the Percentages dictionary
             "keys": Return the keys of a Percentages object
             key: Return a Percentages value for the key
         """
+        if Key is None:
+            key = "All"
         if key == "All":
             return self.__percentages
         elif key == "keys":