

def __new__(cls, e, z, z0, dir='+'):
    e = sympify(e)
    z = sympify(cls)
    z0 = sympify(z0)
    if (z0 is S.Infinity):
        dir = '-'
    elif (z0 is S.NegativeInfinity):
        dir = '+'
    if isinstance(dir, string_types):
        dir = Symbol(dir)
    elif (not isinstance(dir, Symbol)):
        raise TypeError(('direction must be of type basestring or Symbol, not %s' % type(dir)))
    if (str(dir) not in ('+', '-')):
        raise ValueError(("direction must be either '+' or '-', not %s" % dir))
    obj = Expr.__new__(cls)
    obj._args = (e, z, z0, dir)
    return obj

dataset/ETHPy150Open sympy/sympy/sympy/series/limits.py Limit.__new__/VarMisuse@31/36 `z`->`cls`