For me, the compilation failed (in a docker environment we are running on cocalc). Has anyone seen this sympy-error before?
[dochtml] [manifolds] reading sources... [ 96%] tangent_space [dochtml] [manifolds] reading sources... [ 98%] tensorfield [dochtml] [manifolds] reading sources... [100%] vectorfield [dochtml] [manifolds] WARNING: /ext/sage/sage-dev/local/lib/python2.7/site-packages/sage/manifolds/chart.py:docstring of sage.manifolds.chart.RealChart.plot:104: (WARNING/2) Exception occurred in plotting chart-1 [dochtml] [manifolds] from /ext/sage/sage-dev/src/doc/en/reference/manifolds/sage/manifolds/chart.rst: [dochtml] [manifolds] Traceback (most recent call last): [dochtml] [manifolds] File "/ext/sage/sage-dev/local/lib/python2.7/site-packages/matplotlib/sphinxext/plot_directive.py", line 517, in run_code [dochtml] [manifolds] six.exec_(code, ns) [dochtml] [manifolds] File "/ext/sage/sage-dev/local/lib/python2.7/site-packages/matplotlib/externals/six.py", line 672, in exec_ [dochtml] [manifolds] exec("""exec _code_ in _globs_, _locs_""") [dochtml] [manifolds] File "<string>", line 1, in <module> [dochtml] [manifolds] File "<string>", line 2, in <module> [dochtml] [manifolds] File "/ext/sage/sage-dev/local/lib/python2.7/site-packages/sage/manifolds/manifold.py", line 1513, in chart [dochtml] [manifolds] return self._structure.chart(self, coordinates=coordinates, names=names) [dochtml] [manifolds] File "sage/misc/classcall_metaclass.pyx", line 330, in sage.misc.classcall_metaclass.ClasscallMetaclass.__call__ (build/cythonized/sage/misc/classcall_metaclass.c:1589) [dochtml] [manifolds] return cls.classcall(cls, *args, **kwds) [dochtml] [manifolds] File "sage/misc/cachefunc.pyx", line 1059, in sage.misc.cachefunc.CachedFunction.__call__ (build/cythonized/sage/misc/cachefunc.c:6238) [dochtml] [manifolds] w = self.f(*args, **kwds) [dochtml] [manifolds] File "/ext/sage/sage-dev/local/lib/python2.7/site-packages/sage/structure/unique_representation.py", line 1021, in __classcall__ [dochtml] [manifolds] instance = typecall(cls, *args, **options) [dochtml] [manifolds] File "sage/misc/classcall_metaclass.pyx", line 497, in sage.misc.classcall_metaclass.typecall (build/cythonized/sage/misc/classcall_metaclass.c:2039) [dochtml] [manifolds] return (<PyTypeObject*>type).tp_call(cls, args, kwds) [dochtml] [manifolds] File "/ext/sage/sage-dev/local/lib/python2.7/site-packages/sage/manifolds/chart.py", line 1383, in __init__ [dochtml] [manifolds] Chart.__init__(self, domain, coordinates=coordinates, names=names) [dochtml] [manifolds] File "/ext/sage/sage-dev/local/lib/python2.7/site-packages/sage/manifolds/chart.py", line 278, in __init__ [dochtml] [manifolds] self._init_coordinates(coord_list) [dochtml] [manifolds] File "/ext/sage/sage-dev/local/lib/python2.7/site-packages/sage/manifolds/chart.py", line 1451, in _init_coordinates [dochtml] [manifolds] assume(coord_var, 'real') [dochtml] [manifolds] File "/ext/sage/sage-dev/local/lib/python2.7/site-packages/sage/symbolic/assumptions.py", line 550, in assume [dochtml] [manifolds] x.assume() [dochtml] [manifolds] File "/ext/sage/sage-dev/local/lib/python2.7/site-packages/sage/symbolic/assumptions.py", line 239, in assume [dochtml] [manifolds] maxima.eval("declare(%s, %s)" % (self._var._maxima_init_(), self._assumption)) [dochtml] [manifolds] File "sage/structure/sage_object.pyx", line 818, in sage.structure.sage_object.SageObject._maxima_init_ (build/cythonized/sage/structure/sage_object.c:9257) [dochtml] [manifolds] return self._interface_init_(I) [dochtml] [manifolds] File "sage/symbolic/expression.pyx", line 833, in sage.symbolic.expression.Expression._interface_init_ (build/cythonized/sage/symbolic/expression.cpp:8007) [dochtml] [manifolds] from sage.symbolic.expression_conversions import InterfaceInit [dochtml] [manifolds] File "/ext/sage/sage-dev/local/lib/python2.7/site-packages/sage/symbolic/expression_conversions.py", line 844, in <module> [dochtml] [manifolds] sympy_converter = SympyConverter() [dochtml] [manifolds] File "/ext/sage/sage-dev/local/lib/python2.7/site-packages/sage/symbolic/expression_conversions.py", line 689, in __init__ [dochtml] [manifolds] sympy_init() [dochtml] [manifolds] File "/ext/sage/sage-dev/local/lib/python2.7/site-packages/sage/repl/ipython_extension.py", line 561, in wrapper [dochtml] [manifolds] result = func(*args, **kwargs) [dochtml] [manifolds] File "/ext/sage/sage-dev/local/lib/python2.7/site-packages/sage/interfaces/sympy.py", line 649, in sympy_init *[dochtml] [manifolds] from sympy import Add * *[dochtml] [manifolds] ImportError: No module named sympy* [dochtml] [manifolds] WARNING: /ext/sage/sage-dev/local/lib/python2.7/site-packages/sage/manifolds/chart.py:docstring of sage.manifolds.chart.RealChart.plot:141: (WARNING/2) Exception occurred in plotting chart-2 [dochtml] [manifolds] from /ext/sage/sage-dev/src/doc/en/reference/manifolds/sage/manifolds/chart.rst: [dochtml] [manifolds] Traceback (most recent call last): [dochtml] [manifolds] File "/ext/sage/sage-dev/local/lib/python2.7/site-packages/matplotlib/sphinxext/plot_directive.py", line 517, in run_code [dochtml] [manifolds] six.exec_(code, ns) [... and many many more such errors ...] 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