<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def dumpJson(obj, **kwargs):
 """ Match JS's JSON.stringify. When using the default seperators, base64 encoding JSON results in \n sequences in the output. Hawk barfs in your face if you have that in the text"""

    def handleDateAndBinaryForJs(x):
        if six.PY3 and isinstance(x, six.binary_type):
            x = x.decode()
        if isinstance(x, datetime.datetime) or isinstance(x, datetime.date):
            return stringDate(x)
        else:
            return x
    d = json.dumps(obj, separators=(',', ':'), default=handleDateAndBinaryForJs, **kwargs)
    assert '\n' not in d
    return d