JSONDecodeError: Expecting value: line 1 column 1 (char 0)

[ikrambennasrbennasr]

Hello ; please i run this code :

data = json.dumps({'sl':5.84,'sw':3.0,'pl':3.75,'pw':1.1})
r = requests.post(url,data)
print(r.json())

and i get this error:
JSONDecodeError Traceback (most recent call last)
in ()
4 data = json.dumps({'sl':5.84,'sw':3.0,'pl':3.75,'pw':1.1})
5 r = requests.post(url,data)
----> 6 print(r.json())

~/anaconda3/lib/python3.6/site-packages/requests/models.py in json(self, **kwargs)
890 # used.
891 pass
--> 892 return complexjson.loads(self.text, **kwargs)
893
894 @Property

~/anaconda3/lib/python3.6/json/init.py in loads(s, encoding, cls, object_hook, parse_float, parse_int, parse_constant, object_pairs_hook, **kw)
352 parse_int is None and parse_float is None and
353 parse_constant is None and object_pairs_hook is None and not kw):
--> 354 return _default_decoder.decode(s)
355 if cls is None:
356 cls = JSONDecoder

~/anaconda3/lib/python3.6/json/decoder.py in decode(self, s, _w)
337
338 """
--> 339 obj, end = self.raw_decode(s, idx=_w(s, 0).end())
340 end = _w(s, end).end()
341 if end != len(s):

~/anaconda3/lib/python3.6/json/decoder.py in raw_decode(self, s, idx)
355 obj, end = self.scan_once(s, idx)
356 except StopIteration as err:
--> 357 raise JSONDecodeError("Expecting value", s, err.value) from None
358 return obj, end

JSONDecodeError: Expecting value: line 1 column 1 (char 0)

Any help please. Thanks