task_listhistory.py

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import os
from taskinit import *

def listhistory(vis=None):
        """List the processing history of a dataset:
        The list of all task processing steps will be
        given in the logger.

        Keyword arguments:
        vis -- Name of input visibility file (MS)
                default: none; example: vis='ngc5921.ms'

        """
        #Python script
        try:
                if ((type(vis)==str) & (os.path.exists(vis))):
                        ms.open(vis)
                else:
                        raise Exception, 'Visibility data set not found - please verify the name'
                ms.listhistory()
                ms.close()
        except Exception, instance:
                print '*** Error ***',instance