Sympy Google Colab issue

[Gopal M.]

Hi all,

I have been receiving the following import error when executing sympy in a Google Colab notebook. 

ImportError Traceback (most recent call last) <ipython-input-22-7a57ce630735> in <module>() 

----> 1 from quple import ParameterisedCircuit 

2 # Building a circuit of 4 qubits with a layer of CNOT gates using 

3 # the nearest neighbor interaction graph 

4 circuit = ParameterisedCircuit(n_qubit=4) 

5 circuit.add_entanglement_layer(['CNOT'], entangle_strategy=nearest_neighbor)

11 frames

/usr/local/lib/python3.7/dist-packages/sympy/solvers/ode/systems.py in <module>() 19 from sympy.sets.sets import FiniteSet 

20 from sympy.solvers.deutils import ode_order ---> 

21 from sympy.solvers.solveset import NonlinearError, solveset 

22 from sympy.utilities import default_sort_key 

23 from sympy.utilities.iterables import ordered 

ImportError: cannot import name 'NonlinearError' from 'sympy.solvers.solveset' (/usr/local/lib/python3.7/dist-packages/sympy/solvers/solveset.py) --------------------------------------------------------------------------- NOTE: If your import is failing due to a missing package, you can manually install dependencies using either !pip or !apt. To view examples of installing some common dependencies, click the "Open Examples" button below. ---------------------------------------------------------------------------

Any thoughts about the cause of this? Missing dependencies? 

Thank you!