docs: def qstat(jobid, context='grid'):
    """Queries status of a given job.
  
    Keyword parameters:
  
    jobid
      The job identifier as returned by qsub()
  
    context
      The setshell context in which we should try a 'qsub'. Normally you don't
      need to change the default. This variable can also be set to a context
      dictionary in which case we just setup using that context instead of
      probing for a new one, what can be fast.
  
    Returns a dictionary with the specific job properties
    """
  
    scmd = ['qstat', '-j', '%d' % jobid, '-f']
  
    logger.debug("Qstat command '%s'", ' '.join(scmd))
  
    from .setshell import sexec
    data = str_(sexec(context, scmd, error_on_nonzero=False))
  
    # some parsing:
    retval = {}
    for line in data.split('\n'):
      s = line.strip()
      if s.lower().find('do not exist') != -1: return {}
      if not s or s.find(10*'=') != -1: continue
      kv = QSTAT_FIELD_SEPARATOR.split(s, 1)
      if len(kv) == 2: retval[kv[0]] = kv[1]
  
    return retval