symbolic package problem

[Prasad Mehendale]

Hi,
I am using octave 5.2 on Debian Buster. I installed symbolic package using 
command "pkg install -Forge symbolic".
After the installation, I loaded the package symbolic. When trying an example 
for intgration,
I get following error:

syms x
Symbolic pkg v2.9.0: Traceback (most recent call last):
  File "<string>", line 1, in <module>
ModuleNotFoundError: No module named 'sympy'
error: Python cannot import SymPy: have you installed SymPy?
    Try "sympref diagnose" for more information.
error: called from
    assert_have_python_and_sympy at line 123 column 7
    python_ipc_popen2 at line 79 column 5
    python_ipc_driver at line 62 column 15
    pycall_sympy__ at line 163 column 11
    valid_sym_assumptions at line 38 column 10
    assumptions at line 82 column 7
    syms at line 97 column 13

Please guide. Thanks.
--mathkida