Get rid of some unnecessary commented out code (issue 3750)
Uncomment quantum printing test
Rewrite comment in test_hydrogen.py
Uncomment test_python_matrix()
Fix quantum printing test
Revert comment in test_failing_integrals.py
Revert back assert in sympy/core/tests/test_expr.py
sympy/core/tests/test_expr.py: new XFAIL for UndefinedFunction
Revert back #assert in test_error_functions.py
Uncomment test for conjugate of erf2()
Revert back #assert in test_spec_polynomials.py
Uncomment XFAIL test in test_spec_polynomials.py
Revert back #assert in test_identitysearch.py
Uncomment assert in test_identitysearch.py
Revert back #assert in test_evalf.py
Revert #assert in test_wester.py
Add comment for Wester test I11
Revert back #assert in test_rde.py
Revert back #assert in test_theanocode.py
Revert back #assert in test_continuous_rv.py