Python bindings

[Ali A. Salehpour]

Hello, 

I am using Ubuntu 22.04 on WSL 2 to install ns-3. 

I downloaded and install ns-3.38 by ./ns3 tool. However, the Python bindings is "OFF" and I couldn't to enable it. I Want to use Python to run ns-3 programs, thus, I need Python bindings. 

How can I enable it?

[Tom Henderson]

You need to have Python cppyy installed, no later than version 2.4.2.  You can check the version like this:

  $ python3
  Python 3.8.10 (default, Jun 22 2022, 20:18:18)
  [GCC 9.4.0] on linux
  Type "help", "copyright", "credits" or "license" for more information.
  >>> import cppyy
  >>> print("%s" % cppyy.__version)
  2.4.2
  >>>

To install this specific version, you can use pip like this:

  $ python3 -m pip install cppyy==2.4.2

Then, to enable Python bindings, you add the following to the configure step:

  $ ./ns3 configure --enable-python-bindings

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[Ali A. Salehpour]

Thank you very much, Tom.

I worked properly. But, when I closed the terminal and ran "first.py" again, I faced the same error (no module named 'ns').

I ran the following command and it was fixed.

$ pip install ns3

[Tom Henderson]

Keep in mind that what you did the second time did a very different
thing-- it installed the ns-3 libraries from pip. The first command
used the ns-3 libraries built locally.

Now, you may have two installations of ns-3 libraries on your system,
and depending on how your Python environment (path) is set up, one will
take precedence the next time that you call 'import ns3'.

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