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56	56	**Slide** listing prerequisites
57	57	)))
58	58
59		-I shall be demonstrating the installation on a computer with Ubuntu 20.04 OS installed. The steps are likely to remain very similar for other versions of Ubuntu OS, and also not expected to vary significantly for other Linux distributions. In the latter case, you will find on the Internet about how to carry out the equivalent of the tasks demonstrated here using Ubuntu OS. Also, the tutorial will focus only on Python 3, as Python 2 has now been deprecated. It is recommended to use Python version 3.6 or higher. I would be using Python 3.8.10 in this tutorial, as it is the default version provided with Ubuntu 20.04.
	59	+I shall be demonstrating the installation on a computer with Ubuntu 20.04 OS installed. The steps are likely to remain very similar for other versions of Ubuntu OS, and also not expected to vary significantly for other Linux distributions. In the latter case, you will find on the Internet about how to carry out the equivalent of the tasks demonstrated here using Ubuntu OS. Also, the tutorial will focus only on Python 3, as Python 2 has now been deprecated. It is recommended to use Python version 3.6 or higher. I would be using Python 3.9.7 in this tutorial.
60	60
61		-(% class="box errormessage" %)
62		-(((
63		-**Note:**
64		-Having multiple versions of Python on your system can produce issues while installing NEST. The method shown below will install NEST for the default version of Python provided by your Ubuntu OS. E.g. for Ubuntu 18.04 this might be Python 3.6.9 and for Ubuntu 20.04 it will likely be 3.8.10. If you wish to associate the NEST installation with a different Python version installed on your system, please refer the NEST installation instructions to do so on their website.
65		-)))
66		-
67	67	(% class="box infomessage" %)
68	68	(((
69	69	**Screencast** - terminal
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81	81	cd pynn_project
82	82	)))
83	83
84		-Next we shall create a virtual environment within this directory. Python 3 provides support for creating virtual environments. Since Python 3.6, the recommended method of creating a new virtual environment is as follows:
	78	+Next we shall create a virtual environment within this directory. Python 3 provides intrinsic support for creating virtual environments. Since Python 3.6, the recommended method of creating a new virtual environment is as follows:
85	85
86	86	(% class="box errormessage" %)
87	87	(((
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147	147
148	148	If there are no error messages here, and the import is successful, then we have completed installing Brian 2.
149	149
150		-We shall now move on to install the NEST simulator. Unlike Brian 2, NEST is not a Python package and therefore it cannot be installed via the 'pip' command.
151	151
152		-At the time of creating this tutorial, the lastest version of NEST is v3.1. This is currently supported by PyNN v0.10, and it is likely that other versions of NEST could potentially be incompatible with this version of PyNN. The installation is done by first adding the PPA repository for NEST and updating apt, followed by the installation of NEST itself.
	145	+We shall now move on to install the NEST simulator. Unlike Brian 2, NEST is not a Python package and therefore its installation is a bit more involved. We shall install the NEST module along with PyNEST, which is a Python interface for controlling the NEST kernel.
153	153
	147	+We first install the NEST module. Version 2.20 is currently supported by PyNN, and it is likely that other versions of NEST might have issues when used with the current version of PyNN. The installation is done by first adding the PPA repository for NEST and updating apt, followed by the installation of NEST itself.
	148	+
154	154	(% class="box infomessage" %)
155	155	(((
156	156	**Screencast** - terminal
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159	159	\\sudo apt-get install nest
160	160	)))
161	161
162		-This installs the NEST module along with PyNEST, which is a Python interface for controlling the NEST kernel. This allows us to use NEST via Python. To confirm that we have properly installed Brian 2 on our computer, we can test as follows:
	157	+At this point, we have installed the NEST module, but it is still not usable via Python. To do so, we next install PyNEST.
163	163
164		-(% class="box infomessage" %)
165		-(((
166		-**Screencast** - terminal
167		-\\(% style="color:#000000" %)python3
168		-\\import nest
169		-\\exit()
170		-)))
171	171
172		-If there are no error messages here, and the import is successful, then we have completed installing NEST simulator.
173	173
174		-We next move on to the third simulation, NEURON. The installation for NEURON is a bit more involved.
175		-
176		-<< add more >>
177		-
178	178	(% class="box successmessage" %)
179	179	(((
180	180	**Slide** recap of learning objectives
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198	198
199	199	(% class="wikigeneratedid" %)
200	200	[[https:~~/~~/realpython.com/python-virtual-environments-a-primer/>>https://realpython.com/python-virtual-environments-a-primer/]]
201		-[[https:~~/~~/briansimulator.org/install/>>https://briansimulator.org/install/]]
202		-[[https:~~/~~/nest-simulator.readthedocs.io/en/v3.1/installation/index.html>>https://nest-simulator.readthedocs.io/en/v3.1/installation/index.html]]