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Source Code for Module fuzzy.utils

 1  # -*- coding: utf-8 -*- 
 2  # 
 3  # Copyright (C) 2009  Rene Liebscher 
 4  # 
 5  # This program is free software; you can redistribute it and/or modify it under 
 6  # the terms of the GNU Lesser General Public License as published by the Free  
 7  # Software Foundation; either version 3 of the License, or (at your option) any 
 8  # later version. 
 9  # 
10  # This program is distributed in the hope that it will be useful, but WITHOUT  
11  # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
12  # FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more 
13  # details. 
14  #  
15  # You should have received a copy of the GNU Lesser General Public License 
16  # along with this program; if not, see <http://www.gnu.org/licenses/>.  
17  # 
18  """Helper functions for  pyfuzzy.""" 
19  __revision__ = "$Id: utils.py,v 1.8 2010-01-19 21:45:35 rliebscher Exp $" 
20   
21 -def prop(func): 
22      """Function decorator for defining property attributes 
23     
24      The decorated function is expected to return a dictionary 
25      containing one or more of the following pairs: 
26        - fget - function for getting attribute value 
27        - fset - function for setting attribute value 
28        - fdel - function for deleting attribute 
29      This can be conveniently constructed by the locals() builtin 
30      function; see: 
31      U{http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/205183} 
32      """ 
33      return property(doc=func.__doc__, **func()) 
34   
35 -def checkRange(value, ranges): 
36      """Checks if the value is in the defined range. 
37       
38      The range definition is a list/iterator from: 
39          - float values belonging to the defined range M{x \in {a}} 
40          - 2-tuples of two floats which define a range not including the tuple values itself M{x \in ]a,b[} 
41          - 2-list of two floats which define a range including the list values M{x \in [a,b]} 
42      The order of elements is not important. So could define the set of integer numbers by a 
43      generator returning the following sequence: M{0,1,-1,2,-2,3-,3,...} . 
44       
45      It returns True if the value is in one of the defined ranges. 
46      Otherwise it returns false. 
47      """ 
48      for part in ranges: 
49          if isinstance(part, float): 
50              if part == value: 
51                  return True 
52          elif isinstance(part, list) and len(part) == 2: 
53              if part[0] <= value and value <= part[1]: 
54                  return True 
55          elif isinstance(part, tuple) and len(part) == 2: 
56              if part[0] < value and value < part[1]: 
57                  return True 
58          else: 
59              from fuzzy.Exception import FuzzyException 
60              raise FuzzyException("Range definition is wrong") 
61      return False 
62   
63   
64  inf = float("inf") 
65  inf_p = float("+inf") 
66  inf_n = float("-inf") 
67   

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