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44	44	**Slide** listing prerequisites
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46	46
47		-I will demonstrate 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 are also not expected to vary significantly for other Linux distributions. In the latter case, you can find information on the Internet about how to carry out the equivalent of the tasks demonstrated here using Ubuntu OS. Also, this tutorial focuses only on Python 3, because Python 2 is no longer supported. It is recommended to use Python version 3.6 or higher. I will be using Python 3.8.10 in this tutorial, because it is the default version provided with Ubuntu 20.04.
	47	+I will demonstrate 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 are also not expected to vary significantly for other Linux distributions. In the latter case, you can find information on the Internet about how to carry out the equivalent of the tasks demonstrated here. Also, this tutorial focuses only on Python 3, because Python 2 is no longer supported. It is recommended to use Python version 3.6 or higher. I will be using Python 3.8.10 in this tutorial, because it is the default version provided with Ubuntu 20.04.
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49	49	(% class="box errormessage" %)
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69	69	cd pynn_project
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72		-Next, we will create a virtual environment within this directory. Python 3 provides support for creating virtual environments. Since Python 3.6, the recommended method for creating a new virtual environment is as follows.
	72	+Next, we will create a virtual environment within this directory. Python 3 provides support for creating virtual environments. To use this, we first install the package named 'python3-venv':
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	74	+(% class="box infomessage" %)
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76		-**Note**
	76	+**Screencast** - terminal
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78		-
79		-For older versions of Python 3, you might be required to manually install `python3-venv` package before being able to run the below command. To install, run:
80		-\\sudo apt-get install python3-venv
81		-\\More recent versions of Python 3 (e.g., v3.9) already have this pre-installed.
	78	+(% style="color:#000000" %)
	79	+sudo apt-get install python3-venv
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	82	+And once this is installed, we can create a new virtual environment as follows.
	83	+
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86	86	**Screencast** - terminal
87		-\\(% style="color:#000000" %)python3 -m venv pynn_env
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	88	+(% style="color:#000000" %)
	89	+sudo apt-get install python3-venv
	90	+python3 -m venv pynn_env
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90	90	(% class="box warningmessage" %)
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217	217	If there are no error messages here, and the import is successful, we have completed installing NEST simulator and are able to load it via Python.
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219		-We next move on to the third simulator, NEURON. Similar to Brian2, the installation for NEURON can be easily done via the 'pip' command. Do note that this method of installation does not auto-enable MPI support. Do visit the NEURON website if you wish to install on clusters or HPC machines.
	222	+We next move on to the third simulator, NEURON. Similar to Brian2, the installation for NEURON can be easily done via the 'pip' command. Do note that this method of installation does not auto-enable MPI support, which would be required for running simulations in parallel. Do visit the NEURON website if you wish to install on clusters or HPC machines.
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