<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def ckcov(ck, idcode, needav, level, tol, timsys, cover=None):
 """ Find the coverage window for a specified object in a specified CK file. http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/ckcov_c.html :param ck: Name of CK file. :type ck: str :param idcode: ID code of object. :type idcode: int :param needav: Flag indicating whether angular velocity is needed. :type needav: bool :param level: Coverage level: (SEGMENT OR INTERVAL) :type level: str :param tol: Tolerance in ticks. :type tol: float :param timsys: Time system used to represent coverage. :type timsys: str :param cover: Window giving coverage for idcode. :type cover: Optional SpiceCell :return: coverage window for a specified object in a specified CK file :rtype: spiceypy.utils.support_types.SpiceCell """

    ck = stypes.stringToCharP(ck)
    idcode = ctypes.c_int(idcode)
    needav = ctypes.c_int(needav)
    level = stypes.stringToCharP(level)
    tol = ctypes.c_double(tol)
    timsys = stypes.stringToCharP(timsys)
    if not cover:
        cover = stypes.SPICEDOUBLE_CELL(20000)
    assert isinstance(cover, stypes.SpiceCell)
    assert cover.dtype == 1
    libspice.ckcov_c(ck, idcode, needav, level, tol, timsys,
                     ctypes.byref(cover))
    return cover