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The "import json"s were left for uniformity with the other code samples in the module's docs.
Also, here's what the pedantically-strict recipes might look like:
def _reject_inf_nan(string):
 if string in {'-Infinity', 'Infinity', 'NaN'}:
 raise ValueError("JSON does not allow infinite or NaN number values")
def _reject_dupe_keys(pairs):
 obj = {}
 for key, value in pairs:
 if key in pairs:
 raise ValueError("Name %s repeated in an object" % repr(key))
 obj[key] = value
 return obj
def strict_loads(string):
 result = loads(string, parse_constant=_reject_inf_nan, object_pairs_hook=_reject_dupe_keys)
 if not isinstance(result, (dict, list)):
 raise ValueError("The top-level entity of the JSON text was not an object or an array")
 return result
def strict_dumps(obj):
 if not isinstance(obj, (dict, list)):
 raise TypeError("The top-level object of a JSON text must be a dict or a list")
 return dumps(obj, allow_nan=False)