Python KeyError: 'OUTPUT_PATH'

Question

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?

Asked By: Batuhan Özkan

||

Source

Answer 1

A KeyError means that an element doesn’t have a key. So that means that os.environ doesn’t have the key 'OUTPUT_PATH'.

Answered By: DanDeg

Answer 2

os.environ lets you access environment variables from your python script, it seems you do not have an environment variable with name OUTPUT_PATH. From the terminal you run your python script, before running your python code set an environment variable with name OUTPUT_PATH such as:

export OUTPUT_PATH="home/inindekikral/Desktop/output.txt"

Your python script will create a file at that location.

Answered By: unlut

Answer 3

I’m sure there are other ways to do this, but for Hackerrank exercises, the file pointer was opened this way:

fptr = open(os.environ['OUTPUT_PATH'], 'w')

… and I want it to just go to standard output.

I just changed that line to

fptr = sys.stdout   # stdout is already an open stream

and it does what I want.

Note that on the one hand, os.environ['OUTPUT_PATH'] is a string, while fptr is a stream/file pointer.

Variations:

If you want to write to a file, you can do it the way suggested above (setting the OUTPUT_PATH environment variable).
Or, you can set the os.environ directly in python, e.g.

os.environ['OUTPUT_PATH'] = 'junk.txt' # before you open the fptr!

Answered By: redpixel

Answer 4

Simply, change the path of the python code to your local path.

fptr = open("./result.output", 'w')

Answered By: Stanley Ko

Answer 5

Hackerrank sends output to a file, but for practice locally, the output can be printed.

You can remove the use of ftpr by commenting out these lines
fptr = open(os.environ[‘OUTPUT_PATH’], ‘w’) and
fptr.close()

And replace line fptr.write(str(result) + ‘n’) with print(str(result) + ‘n’)

Answered By: user219628

Answer 6

change your code like this:

if __name__ == '__main__':

t = int(input())

for t_itr in range(t):

    n = int(input())

    result = maximumDraws(n)

    print(str(result) + 'n')

Answered By: Chathura Dilshan

Python KeyError: 'OUTPUT_PATH'

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