Mercurial > pylearn

annotate lookup_list.py @ 123:8b520423d4ee

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bugfix
author Frederic Bastien <bastienf@iro.umontreal.ca>
date Wed, 07 May 2008 16:17:25 -0400
parents 8fa1ef2411a0
children b4657441dd65 ff6b7bfb6cdc
rev   line source
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b6b36f65664f Created virtual sub-classes of DataSet: {Finite{Length,Width},Sliceable}DataSet,
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1
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2 from copy import deepcopy
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3
ff4e551490f1 Added LookupList type in lookup_list.py and used it to keep order
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4 class LookupList(object):
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5 """
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6 A LookupList is a sequence whose elements can be named (and unlike
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7 a dictionary the order of the elements depends not on their key but
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8 on the order given by the user through construction) so that
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9 following syntactic constructions work as one would expect:
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10 example = LookupList(['x','y','z'],[1,2,3])
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11 example['x'] = [1, 2, 3] # set or change a field
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12 print example('z','y') # prints [3,2]
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13 x, y, z = example
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14 x = example[0]
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15 x = example["x"]
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16 print example.keys() # prints ['x','y','z']
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17 print example.values() # prints [[1,2,3],2,3]
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18 print example.items() # prints [('x',[1,2,3]),('y',2),('z',3)]
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19 example.append_keyval('u',0) # adds item with name 'u' and value 0
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20 print len(example) # number of items = 4 here
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21 example2 = LookupList(['v', 'w'], ['a','b'])
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22 print example+example2 # addition is like for lists, a concatenation of the items.
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23 example + example # throw an error as we can't have duplicate name.
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24 Note that the element names should be unique.
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25 """
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26 def __init__(self,names=[],values=[]):
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27 assert len(values)==len(names)
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28 self.__dict__['_values']=values
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29 self.__dict__['_name2index']={}
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30 self.__dict__['_names']=names
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31 for i in xrange(len(values)):
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32 assert names[i] not in self._name2index
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33 self._name2index[names[i]]=i
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34
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35 def keys(self):
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36 return self._names
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37
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38 def values(self):
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39 return self._values
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40
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41 def items(self):
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42 """
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43 Return a list of (name,value) pairs of all the items in the look-up list.
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44 """
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45 return zip(self._names,self._values)
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46
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47 def __getitem__(self,key):
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48 """
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49 The key in example[key] can either be an integer to index the fields
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50 or the name of the field.
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51 """
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52 if isinstance(key,int) or isinstance(key,slice) or isinstance(key,list):
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53 return self._values[key]
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54 else: # if not an int, key must be a name
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55 # expecting key to be a valid field name
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56 assert isinstance(key,str)
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57 return self._values[self._name2index[key]]
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58
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59 def __setitem__(self,key,value):
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60 if isinstance(key,int):
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61 self._values[key]=value
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62 else: # if not an int, key must be a name
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63 if key in self._name2index:
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64 self._values[self._name2index[key]]=value
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65 else:
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66 self.append_keyval(key,value)
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67
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68 def append_keyval(self, key, value):
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69 assert key not in self._name2index
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70 self._name2index[key]=len(self)
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71 self._values.append(value)
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72 self._names.append(key)
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73
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74 def __len__(self):
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75 return len(self._values)
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76
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77 def __repr__(self):
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78 return "{%s}" % ", ".join([str(k) + "=" + repr(v) for k,v in self.items()])
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80 def __add__(self,rhs):
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81 new_example = deepcopy(self)
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82 for item in rhs.items():
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83 new_example.append_keyval(item[0],item[1])
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84 return new_example
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85
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86 def __radd__(self,lhs):
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87 new_example = deepcopy(lhs)
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88 for item in self.items():
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89 new_example.append_keyval(item[0],item[1])
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90 return new_example
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91
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92 def __eq__(self, other):
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93 return self._values==other._values and self._name2index==other._name2index and self._names==other._names
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94
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95 def __ne__(self, other):
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96 return not self.__eq__(other)
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97
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98 def __hash__():
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99 raise NotImplementedError()
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100
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101 def __call__(*names):
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102 """
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103 Return a list of values associated with the given names (which must all be keys of the lookup list).
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104 """
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105 return [self[name] for name in names]