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"""Definitions of common exceptions for `polys` module. """
from sympy.utilities import public
@public
class BasePolynomialError(Exception):
"""Base class for polynomial related exceptions. """
def new(self, *args):
raise NotImplementedError("abstract base class")
@public
class ExactQuotientFailed(BasePolynomialError):
def __init__(self, f, g, dom=None):
self.f, self.g, self.dom = f, g, dom
def __str__(self): # pragma: no cover
from sympy.printing.str import sstr
if self.dom is None:
return "%s does not divide %s" % (sstr(self.g), sstr(self.f))
else:
return "%s does not divide %s in %s" % (sstr(self.g), sstr(self.f), sstr(self.dom))
def new(self, f, g):
return self.__class__(f, g, self.dom)
@public
class PolynomialDivisionFailed(BasePolynomialError):
def __init__(self, f, g, domain):
self.f = f
self.g = g
self.domain = domain
def __str__(self):
if self.domain.is_EX:
msg = "You may want to use a different simplification algorithm. Note " \
"that in general it's not possible to guarantee to detect zero " \
"in this domain."
elif not self.domain.is_Exact:
msg = "Your working precision or tolerance of computations may be set " \
"improperly. Adjust those parameters of the coefficient domain " \
"and try again."
else:
msg = "Zero detection is guaranteed in this coefficient domain. This " \
"may indicate a bug in SymPy or the domain is user defined and " \
"doesn't implement zero detection properly."
return "couldn't reduce degree in a polynomial division algorithm when " \
"dividing %s by %s. This can happen when it's not possible to " \
"detect zero in the coefficient domain. The domain of computation " \
"is %s. %s" % (self.f, self.g, self.domain, msg)
@public
class OperationNotSupported(BasePolynomialError):
def __init__(self, poly, func):
self.poly = poly
self.func = func
def __str__(self): # pragma: no cover
return "`%s` operation not supported by %s representation" % (self.func, self.poly.rep.__class__.__name__)
@public
class HeuristicGCDFailed(BasePolynomialError):
pass
class ModularGCDFailed(BasePolynomialError):
pass
@public
class HomomorphismFailed(BasePolynomialError):
pass
@public
class IsomorphismFailed(BasePolynomialError):
pass
@public
class ExtraneousFactors(BasePolynomialError):
pass
@public
class EvaluationFailed(BasePolynomialError):
pass
@public
class RefinementFailed(BasePolynomialError):
pass
@public
class CoercionFailed(BasePolynomialError):
pass
@public
class NotInvertible(BasePolynomialError):
pass
@public
class NotReversible(BasePolynomialError):
pass
@public
class NotAlgebraic(BasePolynomialError):
pass
@public
class DomainError(BasePolynomialError):
pass
@public
class PolynomialError(BasePolynomialError):
pass
@public
class UnificationFailed(BasePolynomialError):
pass
@public
class UnsolvableFactorError(BasePolynomialError):
"""Raised if ``roots`` is called with strict=True and a polynomial
having a factor whose solutions are not expressible in radicals
is encountered."""
@public
class GeneratorsError(BasePolynomialError):
pass
@public
class GeneratorsNeeded(GeneratorsError):
pass
@public
class ComputationFailed(BasePolynomialError):
def __init__(self, func, nargs, exc):
self.func = func
self.nargs = nargs
self.exc = exc
def __str__(self):
return "%s(%s) failed without generators" % (self.func, ', '.join(map(str, self.exc.exprs[:self.nargs])))
@public
class UnivariatePolynomialError(PolynomialError):
pass
@public
class MultivariatePolynomialError(PolynomialError):
pass
@public
class PolificationFailed(PolynomialError):
def __init__(self, opt, origs, exprs, seq=False):
if not seq:
self.orig = origs
self.expr = exprs
self.origs = [origs]
self.exprs = [exprs]
else:
self.origs = origs
self.exprs = exprs
self.opt = opt
self.seq = seq
def __str__(self): # pragma: no cover
if not self.seq:
return "Cannot construct a polynomial from %s" % str(self.orig)
else:
return "Cannot construct polynomials from %s" % ', '.join(map(str, self.origs))
@public
class OptionError(BasePolynomialError):
pass
@public
class FlagError(OptionError):
pass
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