pyknotid/spacecurves/knot.py:254:                import sympy as sym
pyknotid/spacecurves/knot.py:703:        from vispy.geometry import create_sphere
pyknotid/spacecurves/knot.py:704:        from vispy.scene import Mesh
pyknotid/spacecurves/knot.py:715:        pvis.vispy_canvas.view.add(mesh1)
pyknotid/spacecurves/knot.py:716:        pvis.vispy_canvas.view.add(mesh2)
pyknotid/invariants.py:30:import sympy as sym
pyknotid/invariants.py:64:    variable : float or complex or sympy variable
pyknotid/invariants.py:66:        but may be switched to the sympy variable ``t`` in the future.
pyknotid/invariants.py:68:        crossings) or sympy
pyknotid/invariants.py:81:        numpy or sympy as appropriate. If maxima or mathematica, that
pyknotid/invariants.py:126:        return _alexander_sympy(crossings, variable, quadrant)
pyknotid/invariants.py:182:def _alexander_sympy(crossings, variable=None, quadrant='lr'):
pyknotid/invariants.py:185:    with the variable replaced by some sympy expression.
pyknotid/invariants.py:189:    import sympy as sym
