33 lines
1.0 KiB
Python
33 lines
1.0 KiB
Python
"""Implementation of :class:`CompositeDomain` class. """
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from sympy.polys.domains.domain import Domain
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from sympy.polys.polyerrors import GeneratorsError
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from sympy.utilities import public
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@public
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class CompositeDomain(Domain):
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"""Base class for composite domains, e.g. ZZ[x], ZZ(X). """
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is_Composite = True
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gens, ngens, symbols, domain = [None]*4
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def inject(self, *symbols):
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"""Inject generators into this domain. """
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if not (set(self.symbols) & set(symbols)):
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return self.__class__(self.domain, self.symbols + symbols, self.order)
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else:
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raise GeneratorsError("common generators in %s and %s" % (self.symbols, symbols))
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def drop(self, *symbols):
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"""Drop generators from this domain. """
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symset = set(symbols)
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newsyms = tuple(s for s in self.symbols if s not in symset)
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domain = self.domain.drop(*symbols)
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if not newsyms:
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return domain
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else:
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return self.__class__(domain, newsyms, self.order)
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