i need to execute the examples written in python with ns3

[Alyaa “Researcher” Al_mula]

hello friends how can i execute the python examples in ns3, the ns3 doesnt recognize the module of ns .. please help me 

[BENMADANI Houssem Eddine]

First, you have to make sure that Python Bindings is enabled. If not, enable it using this command:

./ns3 configure --enable-python-bindings

Then run the python example.

./ns3 run scratch/first.py

[Alyaa “Researcher” Al_mula]

in fact thanks a lot, the python program is starting in execution, but after a while a got this error ( for all examples of python):  gmake: *** [Makefile:146: all] Error 2

i wish you help if you could please 

[Tommaso Pecorella]

Simple question: did you read the tutorial and the installation guide?

[Alyaa “Researcher” Al_mula]

yes but i did not understand all it, and there is commands didnt work with me 

[Alyaa “Researcher” Al_mula]

this is line 146: $(MAKE) $(MAKESILENT) -f CMakeFiles/Makefile2 all

On Sunday 31 December 2023 at 02:25:32 UTC+3 Tommaso Pecorella wrote:

[Tommaso Pecorella]

I'm referring to this: https://www.nsnam.org/docs/installation/html/index.html

In order to run the python examples you have to successfully BUILD ns3.

[Alyaa “Researcher” Al_mula]

i already build the ns3, and the examples of c++ it have been simulated successfully 

[Alyaa “Researcher” Al_mula]

ok, i installed the libraries from this website and i got this: 

[ 99%] Linking CXX shared library ../../build/lib/libns3.40-aodv-test-default.so
[ 99%] Building CXX object utils/CMakeFiles/test-runner.dir/test-runner.cc.o
[100%] Linking CXX executable ../build/utils/ns3.40-test-runner-default
Traceback (most recent call last):
  File "/home/alyaa/ns-allinone-3.40/ns-3.40/tes1.py", line 1, in <module>
    import ns3
ModuleNotFoundError: No module named 'ns3'
Command 'python3 tes1.py' returned non-zero exit status 1.

[Tommaso Pecorella]

Please check that you have the correct Cppyy version:

Python requires Cppyy, <https://cppyy.readthedocs.io/en/latest/installation.html> and specifically, version 2.4.2 is the latest version known to work with ns-3 at this time.
python3 -m pip install --user cppyy==2.4.2

moreover, check that the result of the configuration do state that python binding are enabled.

[Alyaa “Researcher” Al_mula]

i checked the cmakechach.txt, and i found this : //Build ns-3 python bindings
NS3_PYTHON_BINDINGS:BOOL=ON

[zeyad omar]

I had the same issue, I used pip install ns3 but didn't work until I found I was using the wrong python version (2.7) so I installed python 3.10 and typed pip install ns3 didn't work as well I typed python --version and got 2.7 that was the default version my system uses so I did this trick in my ubuntu terminal I typed "code ~/.bashrc" to open that file which controls how my terminal executes commands and I typed this line at the end of the file " alias python='/usr/local/bin/python3.10' " which means whenever I type python I mean python 3.10 when I did that I didn't get the NS3 no module found error but It took more than 30 minutes to run that simple script so I gave up on using python.

so to summarize:-
- in terminal write "code ~/.bashrc"

- add this line " alias python='/usr/local/bin/python3.10' " to the end of the file.

- save, close the file, and build NS3

- run your first python script

hope it helps