<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def ekuced(handle, segno, recno, column, nvals, dvals, isnull):
 """ Update a double precision column entry in a specified EK record. http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/ekuced_c.html :param handle: EK file handle. :type handle: int :param segno: Index of segment containing record. :type segno: int :param recno: Record to which data is to be updated. :type recno: int :param column: Column name. :type column: str :param nvals: Number of values in new column entry. :type nvals: int :param dvals: Double precision values comprising new column entry. :type dvals: Array of floats :param isnull: Flag indicating whether column entry is null. :type isnull: bool """

    handle = ctypes.c_int(handle)
    segno = ctypes.c_int(segno)
    recno = ctypes.c_int(recno)
    column = stypes.stringToCharP(column)
    nvals = ctypes.c_int(nvals)
    dvals = stypes.toDoubleVector(dvals)
    isnull = ctypes.c_int(isnull)
    libspice.ekaced_c(handle, segno, recno, column, nvals, dvals, isnull)