[Python] Python KeyError: 'OUTPUT_PATH'

I'm trying to run the following python code for to exercise

#!/bin/python3

import os
import sys

#
# Complete the maximumDraws function below.
#
def maximumDraws(n):
return n+1

if __name__ == '__main__':
fptr = open(os.environ['OUTPUT_PATH'], 'w')

t = int(input())

for t_itr in range(t):
n = int(input())

result = maximumDraws(n)

fptr.write(str(result) + '\n')

fptr.close()


but i get this error message

Traceback (most recent call last):
File "maximumdraws.py", line 13, in <module>
fptr = open(os.environ['OUTPUT_PATH'], 'w')
File "/home/inindekikral/anaconda3/lib/python3.6/os.py", line 669, in __getitem__
raise KeyError(key) from None
KeyError: 'OUTPUT_PATH'


My Operation System is Linux Mint 19 Cinnamon. What i have to do?

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