Traceback (most recent call last):


 "/usr/lib/python3.8/site-packages/nose/case.py", line 197, in runTest

self.test(*self.arg)


 "/home/tkloczko/rpmbuild/BUILD/arrow-0.15.6/tests/test_arrow.py", line 481, in test_ctime

result = self.arrow.ctime()
AttributeError: 'TestArrowDatetimeInterface' object has no attribute 'arrow'

Traceback (most recent call last):


 "<input>", line 5, in <module>


 "/home/hcui7/miniconda3/envs/dian/lib/python3.7/site-packages/sympy/matrices/expressions/matmul.py", line 138, in doit

expr = canonicalize(MatMul(*args))


 "/home/hcui7/miniconda3/envs/dian/lib/python3.7/site-packages/sympy/strategies/core.py", line 11, in exhaustive_rl

new, old = rule(expr), expr


 "/home/hcui7/miniconda3/envs/dian/lib/python3.7/site-packages/sympy/strategies/core.py", line 95, in switch_rl

return rl(expr)


 "/home/hcui7/miniconda3/envs/dian/lib/python3.7/site-packages/sympy/strategies/core.py", line 85, in do_one_rl

result = rl(expr)


 "/home/hcui7/miniconda3/envs/dian/lib/python3.7/site-packages/sympy/matrices/expressions/matmul.py", line 190, in any_zeros

for arg in mul.args]):


 "/home/hcui7/miniconda3/envs/dian/lib/python3.7/site-packages/sympy/matrices/expressions/matmul.py", line 190, in <listcomp>

for arg in mul.args]):


 "/home/hcui7/miniconda3/envs/dian/lib/python3.7/site-packages/sympy/matrices/matrices.py", line 2141, in __getattr__

"%s has no attribute %s." % (self.__class__.__name__, attr))
AttributeError: ImmutableSparseMatrix has no attribute is_ZeroMatrix.
