Octave reading wrong version of Python

Question

I'm trying to use the symbolic package with Octave.

When I try to use sympref diagnose in Octave I get the error:

Symbolic package diagnostics
============================

Python and SymPy are needed for most features of the Symbolic package.

The Python interpreter is currently: "python3".

Computers may have more than one Python interpreter installed.  If you
need to, you can select a different one using the PYTHON environment
variable (see "help sympref").  For example, to use Python 2, try
    setenv PYTHON python2
    sympref reset

Attempting to run python3 -c "print("Python says hello")"

status = 0
output = Python says hello

Good, Python ran correctly.


Python version
--------------

Let's check what version of Python we are calling...

Attempting to run python3 -c "import sys; print(sys.version)"

status = 0
output = 3.7.3 (default, May  6 2019, 01:39:47)
[Clang 9.0.0 (clang-900.0.39.2)]


SymPy Python Library
--------------------

SymPy is a Python library used by Symbolic for almost all features.

Attempting to run python3 -c "import sympy; print(sympy.__version__)"

Traceback (most recent call last):
  File "<string>", line 1, in <module>
ModuleNotFoundError: No module named 'sympy'
status =  1
output =

Unfortunately status was non-zero: probably Python cannot import sympy.

  * Is there an error message above?

  * Do you have SymPy installed?  If not, please try to install it and
    try again.

  * If you do have SymPy installed, maybe it's installed for a different
   Python interpreter than the one we found?  Please try "setenv" as
   described above to change your python interpreter.

However, I do have Sympy installed. If I run it on the terminal I get:

Python 3.8.5 (default, Sep  4 2020, 02:22:02) 
[Clang 10.0.0 ] :: Anaconda, Inc. on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from sympy import *
>>> x=Symbol('x')
>>> integrate(1/x, x)
log(x)

So Sympy works fine. The problem seems to be that the terminal uses Python 3.8.5 and Octave uses Python 3.7.3.

When I try to use >> setenv PYTHON python3.8 to change the version Octave uses from 3.7 to 3.8, I get an error message asking me if Python is installed.

When I try to run Python 3.7 from the terminal I get the error:

command not found: python3.7

What am I doing wrong and how can I fix it?

question from:https://stackoverflow.com/questions/65907438/octave-reading-wrong-version-of-python

Answer 1

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