docstr: Get the latest minute on or before ``dt`` in which ``asset`` traded.
  
  If there are no trades on or before ``dt``, returns ``pd.NaT``.
  
  Parameters
  ----------
  asset : catalyst.asset.Asset
      The asset for which to get the last traded minute.
  dt : pd.Timestamp
      The minute at which to start searching for the last traded minute.
  
  Returns
  -------
  last_traded : pd.Timestamp
      The dt of the last trade for the given asset, using the input
      dt as a vantage point.
docstr_tok: ["Get","the","latest","minute","on","or","before","``","dt","``","in","which","``","asset","``","traded",".","If","there","are","no","trades","on","or","before","``","dt","``",",","returns","``","pd.NaT","``",".","Parameters","--","--","--","--","--","asset",":","catalyst.asset.Asset","The","asset","for","which","to","get","the","last","traded","minute",".","dt",":","pd.Timestamp","The","minute","at","which","to","start","searching","for","the","last","traded","minute",".","Returns","--","--","--","-","last_traded",":","pd.Timestamp","The","dt","of","the","last","trade","for","the","given","asset",",","using","the","input","dt","as","a","vantage","point","."]
code: def get_last_traded_dt(self, asset, dt):
      """
      Get the latest minute on or before ``dt`` in which ``asset`` traded.
  
      If there are no trades on or before ``dt``, returns ``pd.NaT``.
  
      Parameters
      ----------
      asset : catalyst.asset.Asset
          The asset for which to get the last traded minute.
      dt : pd.Timestamp
          The minute at which to start searching for the last traded minute.
  
      Returns
      -------
      last_traded : pd.Timestamp
          The dt of the last trade for the given asset, using the input
          dt as a vantage point.
      """
      pass
  
file_path: catalyst/catalyst/data/bar_reader.py
imports: from abc import ABCMeta, abstractmethod, abstractproperty
  from six import with_metaclass
label_desc: Use image node_id 7 for calling the BarReader obj's underlying member method code with example usage: obj.get_last_traded_dt(asset, dt) without return types