ex.py

import sys
import time
from sys import argv
t1input = 0
t1output = 0
t2input = '0'
argv1 = "ex.csv"
script, filename = argv, argv1
f = open(filename, 'r')
setstate = 'green'

while True:
    for i, line in enumerate(f):
        #print (line)[36:-4:]
        abc1 =  (line)[36:-11:]
        abc2 = float(abc1)
        abc3 = int(abc2)
        t1input = abc2
        t2input = t1input/1
        print "t1input = %s" % t1input
        print "tank2 = %s" % t2input
        if t2input != t1output:
            if t2input <= (t1input/100)*25:
                setstate =  'red'
            elif t2input <= (t1input/100)*50:
                setstate = 'amber'
            else:
                setstate = 'green'
        print "state is %s" % setstate
        time.sleep(5)