inheriting from datetime

[Rob Conner]

So this is simple, why can't I run the following code? I've tried many
variances of this, but simply cannot inherit from datetime or
datetime.datetime. I get this on line 3.
TypeError: function takes at most 2 arguments (3 given)

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import datetime
_datetime = datetime.datetime

class MyDateTime(_datetime):
    """
    Identical to builtin datetime.datetime, except it accepts
    invalid dates and times as input.
    """
    _valid = True

    def __init__(self, year, month, day, *args, **kw):
        try:
            _datetime.__init__(self, year, month, day, *args, **kw)
        except _datetime.ValueError:
            _valid = False
            self.year   = year
            self.month  = month
            self.day    = day
            self.args   = args
            self.kw     = kw
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