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annotate lookup_list.py @ 12:ff4e551490f1

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Added LookupList type in lookup_list.py and used it to keep order of field names in Example in ArrayDataSet. Example is now just = LookupList.
author bengioy@esprit.iro.umontreal.ca
date Wed, 26 Mar 2008 18:21:57 -0400
parents
children 759d17112b23
rev   line source
12
ff4e551490f1 Added LookupList type in lookup_list.py and used it to keep order
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1
ff4e551490f1 Added LookupList type in lookup_list.py and used it to keep order
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2 class LookupList(object):
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3 """
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4 A LookupList is a sequence whose elements can be named (and unlike
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5 a dictionary the order of the elements depends not on their key but
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6 on the order given by the user through construction) so that
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7 following syntactic constructions work as one would expect:
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8 example = Example(['x','y','z'],[1,2,3])
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9 example.x = [1, 2, 3] # set or change a field
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10 x, y, z = example
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11 x = example[0]
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12 x = example["x"]
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13 print example.keys() # returns ['x','y','z']
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14 print example.values() # returns [[1,2,3],2,3]
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15 """
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16 def __init__(self,names=[],values=[]):
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17 assert len(values)==len(names)
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18 self.__dict__['_values']=values
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19 self.__dict__['_name2index']={}
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20 self.__dict__['_names']=names
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21 for i in xrange(len(values)):
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22 self._name2index[names[i]]=i
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23
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24 def keys(self):
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25 return _names
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26
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27 def values(self):
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28 return _values
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29
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30 def items(self):
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31 return zip(self._names,self._values)
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32
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33 def __getitem__(self,key):
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34 """
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35 The key in example[key] can either be an integer to index the fields
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36 or the name of the field.
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37 """
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38 if isinstance(key,int):
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39 return self._values[key]
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40 else: # if not an int, key must be a name
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41 return self._values[self._name2index[key]]
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42
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43 def __setitem__(self,key,value):
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44 if isinstance(key,int):
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45 self._values[key]=value
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46 else: # if not an int, key must be a name
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47 if key in self._name2index:
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48 self._values[self._name2index[key]]=value
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49 else:
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50 self._name2index[key]=len(self)
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51 self._values.append(value)
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52 self._names.append(key)
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53
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54 def __getattr__(self,name):
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55 return self._values[self._name2index[name]]
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56
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57 def __setattr__(self,name,value):
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58 if name in self._name2index:
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59 self._values[self._name2index[name]]=value
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60 else:
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61 self._name2index[name]=len(self)
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62 self._values.append(value)
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63 self._names.append(name)
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64
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65 def __len__(self):
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66 return len(self._values)
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67
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68 def __repr__(self):
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69 return "{%s}" % ", ".join([str(k) + "=" + repr(v) for k,v in self.items()])