import sage packages in python

MaelstromYamato
107 ●3 ●4 ●10

kcrisman
12252 ●42 ●136 ●255

An easy way to use sage in python files is demonstrated in the Sage Tutorial.

#!/usr/bin/env sage -python

import sys
from sage.all import *

if len(sys.argv) != 2:
    print "Usage: %s <n>"%sys.argv[0]
    print "Outputs the prime factorization of n."
    sys.exit(1)

print factor(sage_eval(sys.argv[1]))

Well, what if I don't want to import all of sage as shown above using:

from sage.all import *

Instead of this command above, I just want to import the following:

Matrix -> type 'sage.matrix.matrix_integer_dense.Matrix_integer_dense'
vector -> type 'sage.modules.vector_integer_dense.Vector_integer_dense'
ZZ -> type 'sage.rings.integer_ring.IntegerRing_class'
MixedIntegerLinearProgram -> type 'sage.numerical.mip.MixedIntegerLinearProgram'

So I should be able to write something like this in python

from sage.library.package.for.Matrix import *
from sage.library.package.for.vector import *
from sage.library.package.for.ZZ import *
from sage.library.package.for.MixedIntegerLinearProgram import *

I just don't know what they are. Any help is appreciated.

Thanks.

Comments

I'd be really careful with this. The cascade of imports is very convoluted, and there isn't any guarantee that importing something like `ZZ` won't import most of the rest of Sage. It may not be worth the effort.

kcrisman ( 12 years ago )

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answered 12 years ago

John Palmieri

8906 ●20 ●74 ●193 http://www.math.washin...

updated 12 years ago

Matrix -> type 'sage.matrix.matrix_integer_dense.Matrix_integer_dense'

from sage.matrix.all import Matrix

or

from sage.matrix.constructor import Matrix
vector -> type 'sage.modules.vector_integer_dense.Vector_integer_dense'

from sage.modules.free_module_element import vector
ZZ -> type 'sage.rings.integer_ring.IntegerRing_class'

from sage.rings.integer_ring import ZZ
MixedIntegerLinearProgram -> type 'sage.numerical.mip.MixedIntegerLinearProgram'

from sage.numerical.mip import MixedIntegerLinearProgram

Once you know roughly where the class is defined, for example Matrix is defined somewhere in SAGE_ROOT/devel/sage/sage/matrix/, take a look at the file all.py in that directory. In this case you'll find a line

from constructor import matrix, Matrix, column_matrix, random_matrix, diagonal_matrix, identity_matrix, block_matrix, block_diagonal_matrix, jordan_block, zero_matrix, ones_matrix, elementary_matrix, companion_matrix

So that tells you that you can import Matrix from sage.matrix.all or from sage.matrix.constructor. Your other examples can be dealt with similarly.

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Comments

Thanks. This does help!

MaelstromYamato ( 12 years ago )

But this suggestion results in ImportError: cannot import name ZZ.

ml9nn ( 7 years ago )

Sage has changed in the past 5 1/2 years, so whatever suggestion may have worked then may not be valid any more. If you want to ask a new question, please do so.

John Palmieri ( 7 years ago )

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answered 12 years ago

Jason Grout
3505 ●9 ●36 ●81

updated 12 years ago

It seems you are trying to avoid cluttering the namespace? Then do this:

import sage.all
from sage.all import Matrix,vector,ZZ, MixedIntegerLinearProgram

kcrisman was right---lots of Sage depends on lots of other things in Sage, and importing just a piece (i.e., without doing import sage.all) is definitely not supported and may often break or not provide any benefit.

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Comments

Ah, the namespace. See, this doesn't occur to me :)

kcrisman ( 12 years ago )

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