'module'对象在使用python解析JSON时没有属性'loads'

I am trying to parse JSON from Python. I recently started working with Python so I followed some stackoverflow tutorial how to parse JSON using Python and I came up with below code -

#!/usr/bin/python
import json

j = json.loads('{"script":"#!/bin/bash echo Hello World"}')
print j['script']

But whenever I run the above code, I always get this error -

Traceback (most recent call last):
  File "json.py", line 2, in <module>
    import json
  File "/cygdrive/c/ZookPython/json.py", line 4, in <module>
    j = json.loads('{"script":"#!/bin/bash echo Hello World"}')
AttributeError: 'module' object has no attribute 'loads'

Any thoughts what wrong I am doing here? I am running cygwin in windows and from there only I am running my python program. I am using Python 2.7.3

And is there any better and efficient way of parsing the JSON as well?

Update:-

Below code doesn't work if I remove the single quote since I am getting JSON string from some other method -

#!/usr/bin/python

import json

jsonStr = {"script":"#!/bin/bash echo Hello World"}

j = json.loads(jsonStr)
shell_script = j['script']
print shell_script

所以，在反序列化之前，如何确保它也有一个引用？

This is the error I get -

Traceback (most recent call last):
  File "jsontest.py", line 7, in <module>
    j = json.loads(jsonStr)
  File "/usr/lib/python2.7/json/__init__.py", line 326, 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