'Returns e ** self.'

def exp(self, context=None):

    if (context is None):
        context = getcontext()
    ans = self._check_nans(context=context)
    if ans:
        return ans
    if (self._isinfinity() == (-1)):
        return _Zero
    if (not self):
        return _One
    if (self._isinfinity() == 1):
        return Decimal(self)
    p = context.prec
    adj = self.adjusted()
    if ((self._sign == 0) and (adj > len(str(((context.Emax + 1) * 3))))):
        ans = _dec_from_triple(0, '1', (context.Emax + 1))
    elif ((self._sign == 1) and (adj > len(str((((- context.Etiny()) + 1) * 3))))):
        ans = _dec_from_triple(0, '1', (context.Etiny() - 1))
    elif ((self._sign == 0) and (adj < (- p))):
        ans = _dec_from_triple(0, (('1' + ('0' * (p - 1))) + '1'), (- p))
    elif ((self._sign == 1) and (adj < ((- p) - 1))):
        ans = _dec_from_triple(0, ('9' * (p + 1)), ((- p) - 1))
    else:
        op = _WorkRep(self)
        (c, e) = (op.int, op.exp)
        if (op.sign == 1):
            c = (- c)
        extra = 3
        while True:
            (coeff, exp) = _dexp(c, e, (p + extra))
            if (coeff % (5 * (10 ** ((len(str(coeff)) - p) - 1)))):
                break
            extra += 3
        ans = _dec_from_triple(0, str(coeff), exp)
    context = context._shallow_copy()
    rounding = context._set_rounding(ROUND_HALF_EVEN)
    ans = ans._fix(context)
    context.rounding = rounding
    return ans
