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112	112	Notice how this changes the command prompt to show the name of your virtual environment. In our case, we had named it 'pynn_env', and this is now reflected as a prefix to the command prompt. This confirms that we are now in our new virtual environment.
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	114	+(% class="box warningmessage" %)
	115	+(((
	116	+**Note:**
	117	+\\You might be required to run the above command every time you open a new terminal window. Do verify that the terminal command prompt indicates the name of your virtual environment to confirm that you have indeed activated it.
	118	+)))
	119	+
114	114	Now that we have our project's virtual environment setup, we are now ready to install PyNN and other simulators. In general, it is advisable to install the various simulators (especially NEURON and NEST) prior to installing PyNN, because PyNN will then auto compile NEURON's NMODL fles and NEST's extensions during installation. Alternatively, this would need to be done manually as described on the PyNN website. In this tutorial, we will adopt the easier approach and begin by installing the simulators. For the purposes of this tutorial, we shall demonstrate the installation of Brian2, NEURON and NEST simulators.
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116	116	We start here with the installation of Brian 2. Brian 2 can be installed simply using the pip command.
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153	153	\\sudo apt-get install nest
154	154	)))
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156		-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:
	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 NEST on our computer, we can test as follows:
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158	158	(% class="box infomessage" %)
159	159	(((
160	160	**Screencast** - terminal
	167	+\\(% style="color:#000000" %)nest
	168	+)))
	169	+
	170	+This will display the NEST banner, which mentions the version amongst other info. Here, as we can see, we have now installed NEST v3.1 on our system. Let us next verify that this is indeed accessible via Python.
	171	+
	172	+(% class="box infomessage" %)
	173	+(((
	174	+**Screencast** - terminal
161	161	\\(% style="color:#000000" %)python3
162	162	\\import nest
163	163	\\exit()
164	164	)))
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166		-If there are no error messages here, and the import is successful, then we have completed installing NEST simulator.
	180	+(% class="box warningmessage" %)
	181	+(((
	182	+**Note:**
	183	+\\I find that I receive a "no module named nest" error, when trying the above right after installing NEST. But it succeeds after a restart. So if you do observe an error., close all programs and restart your computer, and try again. This time it should execute as expected.
	184	+)))
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	186	+If there are no error messages here, and the import is successful, then we have completed installing NEST simulator, and are able to load it on Python.
	187	+
168	168	We next move on to the third simulation, NEURON. The installation for NEURON is a bit more involved.
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