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You can download Python here.

Check the Use Admin Privileges, and the option to Customize the installation.

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During the installation of the Python Engine,select the option to “Install for all users”.

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if You install python under your local user, you may have issues when running the solution as a service, or deployment the solution for production.

Once you've downloaded, open command prompt as an ADMINISTRATOR and type “pip install pythonnet”. For this work, you'll need internet access. If internet is not available, download and install manually.

Once Python .NET has been installed, you can then start using Python in your solution.

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Go to Solution → Settings tab and locate for the Python GroupBox. Click the "..." button, navigate to find the installed Python Engine, and select the python.exe file.

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# This code call the execution of the external file using Python Shell 
# with the optional args defined in this initial section
#
# The macro _ExecutionPath_ is replaced by the path where the solution is set to execute
# Replace that macro by a specific path, or user other built-in macros as nedded
#

arg1 = @Tag.Tag1
arg2 = @Tag.Tag2
result = TK.ExecutePythonShell("_ExecutionPath_ExternalSum.py", [arg1, arg2])
@Tag.Result = result

When creating Script > Tasks, with this method, the Play Button Image Added in the top toolbar, will execute the Python code directing the printing output to the Designer Output Window.

def sub(val1, val2):
    return val1 - val2

result = sub(@Tag.Tag1[1], @Tag.Tag2[1])
@Tag.Result[1] = result

This scenario and the previous one are both relying in the Python interpreter to evaluate the Python code. The difference is that in the first one the python file is external to the solution, and in this one the Python code is saved inside the Solution file. 

Script.Class.ClassPython.sum(Tag.Tag[1], Tag.Tag[2]

def main(self): return def sum(self, val1, val2): return val1 + val2 def multiply(self, val1: int, val2: int): return val1 * val2

# This code call the execution of the external file using Python Shell with the optional args defined in this initial section
#
# The macro ExecutionPath is replaced by the path where the solution is set to execute
# Replace that macro by a specific path, or user other built-in macros as nedded
#

result = TK.ExecutePythonShell("_ExecutionPath_ExternalSumDataAccess.py", [])

# TKDataAccess is located with the product installation files
# 
# If you move this code to another computer, replace the 127.0.0.1 to server you want to connect
# This code can only run on computers where the product is installed
#
# The Macros _ToolkitPath_ and _ExecutionPort_ are resolved automatically before we call this Python code
# If you call the py file directly you need to replace those macros
#
# _ToolkitPath_ should be replaced by the product binaries folder (location of T.Toolkit.DLL and other DLLs)
# _ExecutionPort_ should be replaced by the port number TServer is running, ex.: 3101 (which is dependent on the ExecutionProfile)

import sys
installPath = "_ToolkitPath_"
sysPath = ";".join(sys.path)
if sysPath.find(installPath) < 0 :
    sys.path.append(installPath)

from TKDataAccess import TKDataAccess

dataAccess = TKDataAccess()
connectionStatus = dataAccess.Connect("127.0.0.1:_ExecutionPort_", "guest", "")

if dataAccess.IsConnected() :

	value1 = dataAccess.GetObjectValue("Tag.Tag1[3]")
	value2 = dataAccess.GetObjectValue("Tag.Tag2[3]")
	ret = value1 / value2
	dataAccess.SetObjectValue("Tag.Result[3]", ret)
	print(str(ret))
	dataAccess.Disconnect()