How to call a Python script from Lua?

Using Lua’s external call functionality makes it possible to execute Python scripts in Lua. There are two common methods to achieve this goal.

1. execute this
2. execute a system command
3. a Python script

os.execute("python script.py")

1. open a connection to a program
2. open a pipe
3. I would use io.popen.

local handle = io.popen("python", "w")
handle:write("print('Hello from Python!')")
handle:close()

handle = io.popen("python script.py")
local output = handle:read("*a")
handle:close()

print(output)

The above example first starts the Python interpreter and writes a line of code to print a message. Next, it closes the input stream and calls the Python script script.py again using the io.popen function. Finally, it reads the output of the Python script and prints it out.

Please make sure that the Python interpreter is installed before executing this code, and that the ‘python’ command can be found in the system’s environment variables.