X-Git-Url: https://svn.cri.ensmp.fr/git/linpy.git/blobdiff_plain/966727e8d6a1bcbb27dfb1586daa233b006b4fca..3ff02ec4a397d81d1019080a78198c454861c1e2:/pypol/isl.py

diff --git a/pypol/isl.py b/pypol/isl.py
index f1e63dc..bbc8d13 100644
--- a/pypol/isl.py
+++ b/pypol/isl.py
@@ -4,21 +4,22 @@ isl format: basic set: ("{[x, y] : x >= 0 and x < 5 and y >= 0 and y < x+4 }")
 """
 
 import ctypes, ctypes.util
+import functools
 import math
 import numbers
 import operator
 import re
-import functools
-
 
 from decimal import Decimal
 from fractions import Fraction
 from functools import wraps
 
+
 libisl = ctypes.CDLL(ctypes.util.find_library('isl'))
 
 libisl.isl_printer_get_str.restype = ctypes.c_char_p
 
+
 def _polymorphic_method(func):
     @functools.wraps(func)
     def wrapper(self, other):
@@ -30,6 +31,7 @@ def _polymorphic_method(func):
         raise TypeError('operand should be a Value or a Rational')
     return wrapper
 
+
 class Context:
 
     __slots__ = ('_ic')
@@ -40,8 +42,8 @@ class Context:
     @property
     def _as_parameter_(self):
         return self._ic
-    
-    #comment out so does not delete itself after being created 
+
+    #comment out so does not delete itself after being created
     #def __del__(self):
     #   libisl.isl_ctx_free(self)
 
@@ -120,19 +122,12 @@ class Value:
             numerator = libisl.isl_val_read_from_str(context, numerator)
             denominator = str(frac.denominator).encode()
             denominator = libisl.isl_val_read_from_str(context, denominator)
-            self._iv = libisl.isl_val_div(numerator, denominator)       
+            self._iv = libisl.isl_val_div(numerator, denominator)
         return self
 
-
     @property
     def _as_parameter_(self):
         return self._iv
-    
-    def symbols(self):
-        s = set()
-        for constraint in self.constraints():
-            s.update(constraint.symbols)
-        yield from sorted(s)
 
     def __del__(self):
         libisl.isl_val_free(self)
@@ -147,7 +142,7 @@ class Value:
     @property
     def denominator(self):
         if self._denominator is None:
-            raise ValueError('not a rational number')        
+            raise ValueError('not a rational number')
         return self._denominator
 
     def __bool__(self):
@@ -258,7 +253,7 @@ class Value:
         return bool(libisl.isl_val_is_infty(self) or
                 libisl.isl_val_is_neginfty(self))
 
-    def is_nan(self): 
+    def is_nan(self):
         return bool(libisl.isl_val_is_nan(self))
 
     def __str__(self):