sage.structure: Remove some module-level imports

[mkoeppe]

New commits:

​5fe64b1	sage.structure.factorization: Make import of sage.rings.integer.Integer local to methods
​eb841de	sage.structure.sequence: Make import of sage.misc.latex local to the latex method
​e45b305	sage.structure.factorization: Make import of sage.misc.misc_c.prod local to methods
​d353497	sage.structure.formal_sum, .parent_gens: Fixup: Remove imports

[tscrim]

These are all okay with me. I am very slightly worried about the Factorization.__pow__, but I doubt anyone is calling that in a sufficiently tight loop for the import to affect that, unless you are calling x^0 or x^1 a lot with x being a factorization. So it is probably fine.

Green patchbot => positive review.

[git]

Branch pushed to git repo; I updated commit sha1. This was a forced push. Last 10 new commits:

​a5453bf	Fixup: Add src/sage/misc/call.py
​64c5701	lazy_import from sage.misc.call with deprecation
​65414f7	Fix imports and one deprecation warning
​b9314d4	sage.misc.call: Add standard header information, add to reference manual
​6024ffd	src/sage/misc/call.py: register_unpickle_override for call_method
​ab4e0fd	Move sage.misc.misc.coeff_repr, repr_lincomb to new module sage.misc.repr
​07e0baa	sage.structure.parent_gens: Remove imports
​646042b	sage.structure.sequence: Make import of sage.misc.latex local to the latex method
​6517828	sage.structure.factorization: Make import of sage.rings.integer.Integer local to methods
​54fabfc	sage.structure.factorization: Make import of sage.misc.misc_c.prod local to methods

[git]

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

​3f5b6ea	Move sage.misc.misc.coeff_repr, repr_lincomb to new module sage.misc.repr
​97199dd	sage.structure.parent_gens: Remove imports
​bb4c6a8	sage.structure.sequence: Make import of sage.misc.latex local to the latex method
​0820283	sage.structure.factorization: Make import of sage.rings.integer.Integer local to methods
​7991b64	sage.structure.factorization: Make import of sage.misc.misc_c.prod local to methods

[git]

Branch pushed to git repo; I updated commit sha1. New commits:

​08fedfa	src/sage/combinat/root_system/type_dual.py: Remove unused variable to fix pyflakes warning
​05efc11	sage.misc.repr.coeff_repr: Add doctest, adapted from sage.misc.latex.coeff_repr
​538323b	src/sage/misc/call.py: Fix block syntax in docstring
​b5f63a5	src/sage/misc/call.py: Returns should be Return
​2c77d17	Merge branch 't/29892/move_sage_misc_misc_coeff_repr__repr_lincomb_to_new_module_sage_misc_repr' into t/29883/sage_structure__remove_some_module_level_imports
​f3afd30	sage.categories.crystals: Make import of sage.misc.latex local to a method
​6433a56	sage.categories: Make imports from sage.rings, .sets, .combinat, .plot, .matrix local to methods
​5c20de7	Merge branch 't/16351/move_searchforest_code_to_sage_sets_recursively_enumerated_set_pyx' into t/29873/sage_categories_remove_module_level_imports
​27f2dab	src/sage/misc/call.py: Add coding directive
​a75ea75	Merge branch 't/29873/sage_categories_remove_module_level_imports' into t/29883/sage_structure__remove_some_module_level_imports

[mkoeppe]

Merged in some tickets to take care of (unrelated) patchbot warnings

[tscrim]

Green patchbot => positive review.

[mkoeppe]

this pyflakes warning looks like an actual bug to me (not from changes on this ticket)

src/sage/categories/finite_dimensional_algebras_with_basis.py:1449:29 undefined name 'x'

... that should be fixed on another ticket.