In Python 3, the strings are identical. In Python 2, if the string is not hard-coded in your script (in which case you can use a Unicode literal, as Roberto suggests), you can decode it:
In [1]: s = 'id\u003d215903184\u0026index\u003d0\u0026st\u003d52\u0026sid\u003d95000\u0026ip\u003d14.145.245.85\u0026pw\u003d'
In [2]: s.decode('unicode-escape')
Out[2]: u'id=215903184&index=0&st=52&sid=95000&ip=14.145.245.85&pw='