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I have a script that I only need to run once. What I usually do for startup scripts is an Always > Tap Sensor. This python script is being activated by a message sensor with the tap setting enabled. Running this script multiple times will cause problems, so I used a variable system to prevent this from happening.
Is there anyway to stop the script from running more than once in the first place, using logic bricks?
For a script that only runs once, say a setup script, you can use an Always Sensor without True level triggering (the buttons outlined in red in the image below). Doing so will unintuitively to the Always Sensor's name will only run once.
As for scripts where you only want a function to run once, but the rest constantly evaluated, I would highly recommend using The Python Controller in Module mode.
The way it works is you pass in the name of your script (must have a .py), then the name of the function. So in the picture my script is named script.py and the function I am calling is functionName.
The final way is to use a variable, or property.
import bge
cont = bge.logic.getCurrentController()
own = cont.owner
if 'init' not in own: # Will only run once, or when the var gets removed
own['init'] = True
print('only once')
Then if you need that code to run again use this line del own['init'].
What do you think about setting a static variable, like a Property, in Blender at the end of the Script that prevents it from running again ?
For more Details see: How to Set a Property Value in Blender Game Engine?
