Re: [sympy] master not working: ImportError: cannot import name roots

[Aaron Meurer]

It works for me.

Make sure that you don't have anything named "roots" laying around. Or
any additional files or directories for that matter (git status will
tell you what untracked file you have in your repository). Python 3
has these annoying "namespace" packages, meaning that if you have any
directory in your current directory (even if it's completely unrelated
to Python) with the same name as a package, it will break Python,
because it will try to import that directory instead of the package.

Aaron Meurer

On Sun, Oct 27, 2013 at 3:26 AM, Pablo Puente <ppu...@googlemail.com> wrote:
> I did a pull from master and now I get an import error:
>
> pape@lenovo:~/sympy$ python3 bin/test
> Traceback (most recent call last):
> File "bin/test", line 76, in <module>
> import sympy
> File "/home/pape/sympy/sympy/__init__.py", line 35, in <module>
> from .polys import *
> File "/home/pape/sympy/sympy/polys/__init__.py", line 21, in <module>
> from . import numberfields
> File "/home/pape/sympy/sympy/polys/numberfields.py", line 26, in <module>
> from sympy.polys.rootoftools import RootOf
> File "/home/pape/sympy/sympy/polys/rootoftools.py", line 16, in <module>
> from sympy.polys.polyroots import (
> File "/home/pape/sympy/sympy/polys/polyroots.py", line 22, in <module>
> from sympy.simplify import simplify, powsimp
> File "/home/pape/sympy/sympy/simplify/__init__.py", line 23, in <module>
> from .hyperexpand import hyperexpand
> File "/home/pape/sympy/sympy/simplify/hyperexpand.py", line 80, in
> <module>
> from sympy.series import residue
> File "/home/pape/sympy/sympy/series/__init__.py", line 6, in <module>
> from .series import series
> File "/home/pape/sympy/sympy/series/series.py", line 4, in <module>
> from sympy.integrals import integrate
> File "/home/pape/sympy/sympy/integrals/__init__.py", line 12, in <module>
> from .integrals import integrate, Integral, line_integrate
> File "/home/pape/sympy/sympy/integrals/integrals.py", line 3, in <module>
> from sympy.concrete.expr_with_limits import AddWithLimits
> File "/home/pape/sympy/sympy/concrete/__init__.py", line 1, in <module>
> from .products import product, Product
> File "/home/pape/sympy/sympy/concrete/products.py", line 11, in <module>
> from sympy.polys import quo, roots
> ImportError: cannot import name roots
>
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[Pablo Puente]

The problem was not on master (sorry) but was caused by a modification i did locallay.

Adding "from sympy.integrals import integrate" in series.py causes, with both python3 and python 2, the ImportError.

I searched for "roots" and found a twisted python library file caled "roots.py" 

pape@lenovo:~/sympy$ locate roots

/home/pape/sympy/sympy/polys/polyroots.py

/home/pape/sympy/sympy/polys/polyroots.pyc

/home/pape/sympy/sympy/polys/__pycache__/polyroots.cpython-33.pyc

/home/pape/sympy/sympy/polys/tests/test_polyroots.py

/home/pape/workspace/.metadata/.plugins/com.python.pydev.analysis/python_v1_3tswbhuj9gc4kibexhrzgzdx/v1_indexcache/sympy.polys.polyroots_5ze7.v1_indexcache

/home/pape/workspace/.metadata/.plugins/com.python.pydev.analysis/python_v1_3tswbhuj9gc4kibexhrzgzdx/v1_indexcache/sympy.polys.tests.test_polyroots_uce2.v1_indexcache

/home/pape/workspace/.metadata/.plugins/com.python.pydev.analysis/python_v1_3tswbhuj9gc4kibexhrzgzdx/v1_indexcache/twisted.python.roots_9ohn.v1_indexcache

/home/pape/workspace/.metadata/.plugins/com.python.pydev.analysis/python_v1_3tswbhuj9gc4kibexhrzgzdx/v1_indexcache/twisted.test.test_roots_eoll.v1_indexcache

/home/pape/workspace/.metadata/.plugins/org.eclipse.core.resources/.projects/sympy/com.python.pydev.analysis/v1_indexcache/sympy.polys.polyroots_5ze7.v1_indexcache

/home/pape/workspace/.metadata/.plugins/org.eclipse.core.resources/.projects/sympy/com.python.pydev.analysis/v1_indexcache/sympy.polys.tests.test_polyroots_uce2.v1_indexcache

/usr/lib/python2.7/dist-packages/sympy/polys/polyroots.py

/usr/lib/python2.7/dist-packages/sympy/polys/polyroots.pyc

/usr/lib/python2.7/dist-packages/sympy/polys/tests/test_polyroots.py

/usr/lib/python2.7/dist-packages/sympy/polys/tests/test_polyroots.pyc

/usr/lib/python2.7/dist-packages/twisted/python/roots.py

/usr/lib/python2.7/dist-packages/twisted/python/roots.pyc

/usr/lib/python2.7/dist-packages/twisted/test/test_roots.py

/usr/lib/python2.7/dist-packages/twisted/test/test_roots.pyc

/usr/share/doc/python-twisted-web/examples/rootscript.py

/usr/share/pyshared/sympy/polys/polyroots.py

/usr/share/pyshared/sympy/polys/tests/test_polyroots.py

/usr/share/pyshared/twisted/python/roots.py

/usr/share/pyshared/twisted/test/test_roots.py

Also I thought it could be caused come from another sympy installation in pythonpath (maybe coming from IPython Notebook). 

pape@lenovo:~/sympy$ locate polytools

/home/pape/sympy/sympy/polys/polytools.py

/home/pape/sympy/sympy/polys/polytools.pyc

/home/pape/sympy/sympy/polys/__pycache__/polytools.cpython-33.pyc

/home/pape/sympy/sympy/polys/tests/test_polytools.py

/home/pape/workspace/.metadata/.plugins/com.python.pydev.analysis/python_v1_3tswbhuj9gc4kibexhrzgzdx/v1_indexcache/sympy.polys.polytools_6qvd.v1_indexcache

/home/pape/workspace/.metadata/.plugins/com.python.pydev.analysis/python_v1_3tswbhuj9gc4kibexhrzgzdx/v1_indexcache/sympy.polys.tests.test_polytools_1mp0.v1_indexcache

/home/pape/workspace/.metadata/.plugins/org.eclipse.core.resources/.projects/sympy/com.python.pydev.analysis/v1_indexcache/sympy.polys.polytools_6qvd.v1_indexcache

/home/pape/workspace/.metadata/.plugins/org.eclipse.core.resources/.projects/sympy/com.python.pydev.analysis/v1_indexcache/sympy.polys.tests.test_polytools_1mp0.v1_indexcache

/usr/lib/python2.7/dist-packages/sympy/polys/polytools.py

/usr/lib/python2.7/dist-packages/sympy/polys/polytools.pyc

/usr/lib/python2.7/dist-packages/sympy/polys/tests/test_polytools.py

/usr/lib/python2.7/dist-packages/sympy/polys/tests/test_polytools.pyc

/usr/share/pyshared/sympy/polys/polytools.py

/usr/share/pyshared/sympy/polys/tests/test_polytools.py

I removed /usr/share/pyshared/sympy/ but the problem still happens.

Any other ideas?

[Aaron Meurer]

Oh, if it came from adding an import, then the issue is most likely
due to a circular import problem. In that case, you'll have to move
the import inside the function that needs it.

Aaron Meurer

[Pablo Puente]

You were right!

i moved, just for testing import integrate in series() and the error is removed.

Thanks.

from __future__ import print_function, division

from sympy.core.sympify import sympify

def series(expr, x=None, x0=0, n=6, dir="+"):

    from sympy.integrals import integrate

    """Series expansion of expr around point `x = x0`.

    See the doctring of Expr.series() for complete details of this wrapper.

    """

    expr = sympify(expr)

    return expr.series(x, x0, n, dir)

[Aaron Meurer]

Put it after the doctest.

Aaron Meurer