simplejson.scanner.JSONDecodeError: Expecting value: line 1 column 1 (char 0) - json

Question

I have been writing a simple plugin for hackerrank to compile and run code, of a problem on hackerrank from my system.
For ex: I need to test code for this problem https://www.hackerrank.com/challenges/solve-me-first
So, I ran my script like:
python hackerrank.py https://www.hackerrank.com/challenges/solve-me-first solve-me-first.cpp
I get following output:
Traceback (most recent call last):
File "hackerrank.py", line 126, in <module>
h.run()
File "hackerrank.py", line 113, in run
if self.compile_and_test() == "NOT_FOUND":
File "hackerrank.py", line 51, in compile_and_test
j = self.r.json()
File "/usr/lib/python2.7/dist-packages/requests/models.py", line 741, in json
return json.loads(self.text, **kwargs)
File "/usr/lib/python2.7/dist-packages/simplejson/__init__.py", line 488, in loads
return _default_decoder.decode(s)
File "/usr/lib/python2.7/dist-packages/simplejson/decoder.py", line 370, in decode
obj, end = self.raw_decode(s)
File "/usr/lib/python2.7/dist-packages/simplejson/decoder.py", line 389, in raw_decode
return self.scan_once(s, idx=_w(s, idx).end())
simplejson.scanner.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
Here is my hackerrank.py file:
import requests
import time
import sys
import os.path
class HackerRank:
def __init__(self,url,code="",ext=".py"):
self.code = code
self.ext = ext
self.set_language()
self.problem_url = url
self.s = requests.session()
self.set_post_url()
def set_post_url(self):
#rootUrl = "https://www.hackerrank.com/"
#l = self.problem_url.split("/")
#print l
#if l[3] == "challenges":
# contestUrl = "/contests/master/challenges/" + l[4]
#else:
# # it's a contest
# contestUrl = "/".join(l[3:])
#self.post_url = rootUrl + "/rest/" + contestUrl + "/compile_tests/"
self.post_url = self.problem_url
def set_language(self):
if self.ext == ".py":
self.language = "python"
if self.ext == ".c":
self.language = "c"
if self.ext == ".cpp":
self.language = "cpp"
if self.ext == ".java":
self.language = "java"
# TODO : find out the language value for other exts
def set_code(self,code):
self.code = code
def generate_payload(self):
self.payload = {'code' : self.code, 'language' : self.language}
def compile_and_test(self):
self.generate_payload()
self.r = self.s.post(self.post_url, params=self.payload)
if self.r.status_code == 404:
print "not found 1"
return "NOT_FOUND"
print "yes"
j = self.r.json()
print j
self.submission_id = j['model']['id']
self.get_url = self.post_url + "/submissions/code/" + str(self.submission_id)
self.rr = self.s.get(self.get_url, cookies = self.s.cookies)
return self.rr
def fetch(self,last_status):
if self.r.status_code == 404:
return
self.rr = self.s.get(self.get_url, cookies = self.s.cookies)
self.res = self.rr.json()
if self.res['model']['status'] == 0:
new_status = self.res['model']['status_string']
if new_status != last_status:
print(new_status)
time.sleep(1)
self.fetch(new_status)
else:
return
def compiler_message(self):
return self.res['model']['compilemessage']
def testcase_message(self):
return self.res['model']['testcase_message']
def expected_output(self):
return self.res['model']['expected_output']
def stdin(self):
return self.res['model']['stdin']
def stdout(self):
return self.res['model']['stdout']
def dump(self):
cm = self.compiler_message()
tm = self.testcase_message()
eo = self.expected_output()
stdin = self.stdin()
stdout = self.stdout()
s = ""
for i in range(len(tm)):
s += (cm + "\n\n")
s += ("Testcase# " + str(i) + "\n")
s += ("Sample Input:\n\n")
s += (stdin[i])
s += ("\n\n")
s += ("Your Output:\n\n")
s += (stdout[i])
s += ("\n\n")
s += ("Expected Output:\n\n")
s += (eo[i])
s += ("\n\n")
s += ("Compiler Message:\n\n")
s += (tm[i])
s += ("\n\n")
print(s)
return s
def run(self):
if self.compile_and_test() == "NOT_FOUND":
print "not found"
return "404 : NOT_FOUND"
self.fetch("")
return self.dump()
if __name__=="__main__":
url = sys.argv[1]
codefile = sys.argv[2]
print url,codefile
ext = os.path.splitext(codefile)[1]
code = open(codefile).read()
h = HackerRank(url,code,ext)
h.run()
I am newbie to json and plugins. Can you help me out.