def __init__(self, function, usage, short_desc, long_desc='',
                 error_desc=None, options=lambda obj, parser: None,
                 uses_basepath=True, hidden=False):
      self.function = function
      self.usage = usage
      self.short_desc = short_desc
      self.long_desc = long_desc
      self.error_desc = error_desc
      self.options = options
      self.uses_basepath = uses_basepath
      self.hidden = hidden
Calculate the number of rows to add to or remove from some data.
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/tools/appcfg.py/AppCfgApp.Action.__init__--crossover with--dataset/ETHPy150Open UDST/urbansim/urbansim/models/transition.py/TabularTotalsTransition._calc_nrows