human
Solve the following python programming problem given the following code:
def calc_time(lower_bound, upper_bound, latitude, longitude, attribute, value, altitude = 0, pressure = 101325, temperature = 12, xtol = 1e-12) : 
    "
    Calculate the time between lower_bound and upper_bound
    where the attribute is equal to value. Uses PyEphem for
    solar position calculations.

    Parameters
    ----------
    lower_bound : datetime.datetime
    upper_bound : datetime.datetime
    latitude : float
    longitude : float
    attribute : str
        The attribute of a pyephem.Sun object that
        you want to solve for. Likely options are 'alt'
        and 'az' (which must be given in radians).
    value : int or float
        The value of the attribute to solve for
    altitude : float
        Distance above sea level.
    pressure : int or float, optional
        Air pressure in Pascals. Set to 0 for no
        atmospheric correction.
    temperature : int or float, optional
        Air temperature in degrees C.
    xtol : float, optional
        The allowed error in the result from value

    Returns
    -------
    datetime.datetime

    Raises
    ------
    ValueError
        If the value is not contained between the bounds.
    AttributeError
        If the given attribute is not an attribute of a
        PyEphem.Sun object.
    " 
    try : 
        import scipy.optimize as so 
except ImportError : 
        raise ImportError ('The calc_time function requires scipy') 
(obs, sun) = _ephem_setup (latitude, longitude, altitude, obs, temperature) 
    def compute_attr(thetime, target, attr) : 
        obs.date = thetime 
        sun.compute (obs) 
        return (getattr (sun, attr) - target) 
lb = datetime_to_djd (lower_bound) 
    ub = datetime_to_djd (upper_bound) 
    djd_root = so.brentq (compute_attr, lb, ub, (value, attribute), xtol = xtol) 
    return djd_to_datetime (djd_root) 

    
    

    Fix the buggy line: (obs, sun) = _ephem_setup (latitude, longitude, altitude, obs, temperature)
assistant
#Here is Python code to fix the buggy line: (obs, sun) = _ephem_setup (latitude, longitude, altitude, obs, temperature)
.

(obs, sun) = _ephem_setup (latitude, longitude, altitude, pressure, temperature)