X-Git-Url: https://scm.cri.ensmp.fr/git/linpy.git/blobdiff_plain/49fa0d574a20817712006d479549dd96ccfff652..42c85c00b3ed474312c4b66a3da0e8208c60d231:/linpy/linexprs.py diff --git a/linpy/linexprs.py b/linpy/linexprs.py index 38fa7a1..e4ed1cc 100644 --- a/linpy/linexprs.py +++ b/linpy/linexprs.py @@ -122,7 +122,7 @@ class LinExpr: """ if not isinstance(symbol, Symbol): raise TypeError('symbol must be a Symbol instance') - return Rational(self._coefficients.get(symbol, 0)) + return self._coefficients.get(symbol, Fraction(0)) __getitem__ = coefficient @@ -131,15 +131,14 @@ class LinExpr: Iterate over the pairs (symbol, value) of linear terms in the expression. The constant term is ignored. """ - for symbol, coefficient in self._coefficients.items(): - yield symbol, Rational(coefficient) + yield from self._coefficients.items() @property def constant(self): """ The constant term of the expression. """ - return Rational(self._constant) + return self._constant @property def symbols(self): @@ -179,9 +178,8 @@ class LinExpr: Iterate over the coefficient values in the expression, and the constant term. """ - for coefficient in self._coefficients.values(): - yield Rational(coefficient) - yield Rational(self._constant) + yield from self._coefficients.values() + yield self._constant def __bool__(self): return True @@ -249,9 +247,10 @@ class LinExpr: """ Test whether two linear expressions are equal. """ - return isinstance(other, LinExpr) and \ - self._coefficients == other._coefficients and \ - self._constant == other._constant + if isinstance(other, LinExpr): + return self._coefficients == other._coefficients and \ + self._constant == other._constant + return NotImplemented def __le__(self, other): from .polyhedra import Le @@ -499,7 +498,9 @@ class Symbol(LinExpr): return True def __eq__(self, other): - return self.sortkey() == other.sortkey() + if isinstance(other, Symbol): + return self.sortkey() == other.sortkey() + return NotImplemented def asdummy(self): """