[Python] Limit RAM usage to python program

I'm trying to limit the RAM usage from a Python program to half so it doesn't totally freezes when all the RAM is used, for this I'm using the following code which is not working and my laptop is still freezing:

import sys
import resource

def memory_limit():
rsrc = resource.RLIMIT_DATA
soft, hard = resource.getrlimit(rsrc)
soft /= 2
resource.setrlimit(rsrc, (soft, hard))

if __name__ == '__main__':
memory_limit() # Limitates maximun memory usage to half
try:
main()
except MemoryError:
sys.stderr.write('MAXIMUM MEMORY EXCEEDED')
sys.exit(-1)


I'm using other functions which I call from the main function.

What am I doing wrong?

Thanks in advance.

PD: I already searched about this and found the code I've put but it's still not working...

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