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Drinfeld modules: Make some imports lazy #35275

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Merged
merged 3 commits into from
Apr 1, 2023
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Drinfeld modules: Make some imports lazy #35275

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002af7d
drinfeld_modules: Make some imports lazy
mkoeppe Mar 13, 2023
e6c6518
sage.rings: Make some imports lazy or move into methods
mkoeppe Mar 13, 2023
72111c6
src/sage/categories/drinfeld_modules.py: Alphabetical order for lazy …
mkoeppe Mar 14, 2023
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8 changes: 5 additions & 3 deletions src/sage/categories/drinfeld_modules.py
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Original file line number Diff line number Diff line change
Expand Up @@ -23,10 +23,12 @@
from sage.categories.homsets import Homsets
from sage.misc.functional import log
from sage.misc.latex import latex
from sage.misc.lazy_import import lazy_import
from sage.rings.integer import Integer
from sage.rings.polynomial.ore_polynomial_ring import OrePolynomialRing
from sage.rings.polynomial.polynomial_ring import PolynomialRing_general
from sage.rings.ring_extension import RingExtension_generic

lazy_import('sage.rings.polynomial.ore_polynomial_ring', 'OrePolynomialRing')
lazy_import('sage.rings.polynomial.polynomial_ring', 'PolynomialRing_general')
lazy_import('sage.rings.ring_extension', 'RingExtension_generic')


class DrinfeldModules(Category_over_base_ring):
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5 changes: 4 additions & 1 deletion src/sage/rings/function_field/all.py
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@@ -1,2 +1,5 @@
from .constructor import FunctionField
from .drinfeld_modules.drinfeld_module import DrinfeldModule

from sage.misc.lazy_import import lazy_import

lazy_import("sage.rings.function_field.drinfeld_modules.drinfeld_module", "DrinfeldModule")
4 changes: 2 additions & 2 deletions src/sage/rings/polynomial/polynomial_ring.py
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Expand Up @@ -166,8 +166,6 @@
import sage.rings.abc
from sage.rings.fraction_field_element import FractionFieldElement
from sage.rings.finite_rings.element_base import FiniteRingElement

from .polynomial_element import PolynomialBaseringInjection
from .polynomial_real_mpfr_dense import PolynomialRealDense
from .polynomial_integer_dense_flint import Polynomial_integer_dense_flint
from sage.rings.polynomial.polynomial_singular_interface import PolynomialRing_singular_repr
Expand Down Expand Up @@ -679,6 +677,8 @@ def _coerce_map_from_base_ring(self):
To: Univariate Polynomial Ring in x over Rational Field
sage: R.coerce_map_from(GF(7))
"""
from .polynomial_element import PolynomialBaseringInjection

return PolynomialBaseringInjection(self.base_ring(), self)

def _coerce_map_from_(self, P):
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