load json from dict python - json

Question

I am trying to convert a dictionary object into json, but unable to do so. I tried json.load(), json.loads() but it gives me following error:
File "lean.py", line 252, in createJSON
return json.loads(jsonElementDict)
File "/usr/lib/python2.7/json/__init__.py", line 338, in loads
return _default_decoder.decode(s)
File "/usr/lib/python2.7/json/decoder.py", line 366, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
TypeError: expected string or buffer
When I print dictionary object, it's as follows:
{
'city': 'Pittsburgh',
'state': 'Pennsylvania',
'gross_floor_area': '',
'energyData': [
{
'cdd': '0.0',
'reading': '80.8',
'monthYear': 'Nov-2014'
},
{
'cdd': '0.0',
'reading': '300000.0',
'monthYear': 'Nov-2014'
}
]
}`
Code:
outputJSON = json.loads(jsonElementDict)
print outputJSON.json['city']