Kent and Max. Thank you very much. It works fine now. Ara
perc = raw_input("Please enter a threshold between 0-1. ")
perc = float(perc)
def percolation(perc):
randval = random.random()
print randval
PERSON, EMPTY = '*', '.'
if randval > perc:
EMPTY
return EMPTY
elif randval < perc:
PERSON
return PERSON
elif randval == perc:
PERSON
return PERSON
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