Mercurial > pylearn

annotate lookup_list.py @ 453:ce6b4fd3ab29

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Fixed typo in help
author delallea@valhalla.apstat.com
date Thu, 04 Sep 2008 13:48:47 -0400
parents 52b4908d8971
children
rev   line source
22
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1
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2 from copy import deepcopy
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3
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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
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25 @note: The element names should be unique.
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26
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27 @todo: Convert this documentation into doctest
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28 format, and actually perform doctest'ing:
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29 U{http://epydoc.sourceforge.net/manual-epytext.html#doctest-blocks}
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30 """
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31 def __init__(self,names=[],values=[]):
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32 #print 'values=', values
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33 #print 'length=', len(values)
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34 #print 'names=', names
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35 #print 'length=',len(names)
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36 assert len(values)==len(names)
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37 self.__dict__['_values']=values
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38 self.__dict__['_name2index']={}
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39 self.__dict__['_names']=names
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40 for i in xrange(len(values)):
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41 assert names[i] not in self._name2index
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42 self._name2index[names[i]]=i
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43
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44 def keys(self):
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45 return self._names
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46
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47 def values(self):
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48 return self._values
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49
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50 def items(self):
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51 """
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52 Return a list of (name,value) pairs of all the items in the look-up list.
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53 """
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54 return zip(self._names,self._values)
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55
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56 def __getitem__(self,key):
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57 """
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58 The key in example[key] can either be an integer to index the fields
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59 or the name of the field.
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60 """
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61 if isinstance(key,int) or isinstance(key,slice) or (isinstance(key,list) and all([isinstance(i,int) for i in key])):
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62 return self._values[key]
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63 else: # if not an int, key must be a name
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64 # expecting key to be a valid field name
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65 assert isinstance(key,str)
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66 return self._values[self._name2index[key]]
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67
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68 def __setitem__(self,key,value):
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69 if isinstance(key,int):
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70 self._values[key]=value
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71 else: # if not an int, key must be a name
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72 if key in self._name2index:
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73 self._values[self._name2index[key]]=value
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74 else:
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75 self.append_keyval(key,value)
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76
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77 def append_keyval(self, key, value):
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78 assert key not in self._name2index
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79 self._name2index[key]=len(self)
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80 self._values.append(value)
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81 self._names.append(key)
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82
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83 def append_lookuplist(self, *list):
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84 for l in list:
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85 for key in l.keys():
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86 self.append_keyval(key,l[key])
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87 del l
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88
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89 def __len__(self):
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90 return len(self._values)
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91
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92 def __repr__(self):
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93 return "{%s}" % ", ".join([str(k) + "=" + repr(v) for k,v in self.items()])
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94
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95 def __add__(self,rhs):
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96 new_example = deepcopy(self)
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97 for item in rhs.items():
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98 new_example.append_keyval(item[0],item[1])
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99 return new_example
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100
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101 def __radd__(self,lhs):
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102 new_example = deepcopy(lhs)
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103 for item in self.items():
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104 new_example.append_keyval(item[0],item[1])
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105 return new_example
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106
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107 def __eq__(self, other):
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108 return self._values==other._values and self._name2index==other._name2index and self._names==other._names
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109
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110 def __ne__(self, other):
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111 return not self.__eq__(other)
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112
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113 def __hash__(self):
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114 raise NotImplementedError()
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115
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116 def __call__(self,*names):
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117 """
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118 Return a list of values associated with the given names (which must all be keys of the lookup list).
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119 """
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120 if names == self._names:
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121 return self._values
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122 return [self[name] for name in names]
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123
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124
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125 if __name__ == '__main__':
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Frederic Bastien <bastienf@iro.umontreal.ca>
parents: 110
diff changeset
126
ff6b7bfb6cdc added function LookupList.append_lookuplist
Frederic Bastien <bastienf@iro.umontreal.ca>
parents: 110
diff changeset
127 a=LookupList(['a'],[1])
ff6b7bfb6cdc added function LookupList.append_lookuplist
Frederic Bastien <bastienf@iro.umontreal.ca>
parents: 110
diff changeset
128 print a
ff6b7bfb6cdc added function LookupList.append_lookuplist
Frederic Bastien <bastienf@iro.umontreal.ca>
parents: 110
diff changeset
129 b=LookupList(['b'],[2])
ff6b7bfb6cdc added function LookupList.append_lookuplist
Frederic Bastien <bastienf@iro.umontreal.ca>
parents: 110
diff changeset
130 print b
ff6b7bfb6cdc added function LookupList.append_lookuplist
Frederic Bastien <bastienf@iro.umontreal.ca>
parents: 110
diff changeset
131 a.append_lookuplist(b)
ff6b7bfb6cdc added function LookupList.append_lookuplist
Frederic Bastien <bastienf@iro.umontreal.ca>
parents: 110
diff changeset
132 print a
ff6b7bfb6cdc added function LookupList.append_lookuplist
Frederic Bastien <bastienf@iro.umontreal.ca>
parents: 110
diff changeset
133 a.append_lookuplist(b)
ff6b7bfb6cdc added function LookupList.append_lookuplist
Frederic Bastien <bastienf@iro.umontreal.ca>
parents: 110
diff changeset
134 print a