Crear un archivo zip (comprimir) con una secuencia de comandos Python

#********************************************************************** # Description: #    Zips the contents of a folder. # Parameters: #   0 - Input folder. #   1 - Output zip file. It is assumed that the user added the .zip  #       extension.   #**********************************************************************  # Import modules and create the geoprocessor # import sys, zipfile, arcpy, os, traceback  # Function for zipping files.  If keep is true, the folder, along with  #  all its contents, will be written to the zip file.  If false, only  #  the contents of the input folder will be written to the zip file -  #  the input folder name will not appear in the zip file. # def zipws(path, zip, keep):     path = os.path.normpath(path)     # os.walk visits every subdirectory, returning a 3-tuple     #  of directory name, subdirectories in it, and file names     #  in it.     #     for (dirpath, dirnames, filenames) in os.walk(path):         # Iterate over every file name         #         for file in filenames:             # Ignore .lock files             #             if not file.endswith('.lock'):                 arcpy.AddMessage("Adding %s..." % os.path.join(path, dirpath, file))                 try:                     if keep:                         zip.write(os.path.join(dirpath, file),                         os.path.join(os.path.basename(path), os.path.join(dirpath, file)[len(path)+len(os.sep):]))                     else:                         zip.write(os.path.join(dirpath, file),                                     os.path.join(dirpath[len(path):], file))                                           except Exception, e:                     arcpy.AddWarning("    Error adding %s: %s" % (file, e))      return None  if __name__ == '__main__':     try:         # Get the tool parameter values         #         infolder = arcpy.GetParameterAsText(0)         outfile = arcpy.GetParameterAsText(1)                        # Create the zip file for writing compressed data. In some rare         #  instances, the ZIP_DEFLATED constant may be unavailable and         #  the ZIP_STORED constant is used instead.  When ZIP_STORED is         #  used, the zip file does not contain compressed data, resulting         #  in large zip files.          #         try:                 zip = zipfile.ZipFile(outfile, 'w', zipfile.ZIP_DEFLATED)                 zipws(infolder, zip, True)                 zip.close()         except RuntimeError:                 # Delete zip file if it exists                 #                 if os.path.exists(outfile):                         os.unlink(outfile)                 zip = zipfile.ZipFile(outfile, 'w', zipfile.ZIP_STORED)                 zipws(infolder, zip, True)                 zip.close()                 arcpy.AddWarning("    Unable to compress zip file contents.")                             arcpy.AddMessage("Zip file created successfully")      except:         # Return any Python specific errors as well as any errors from the geoprocessor         #         tb = sys.exc_info()[2]         tbinfo = traceback.format_tb(tb)[0]         pymsg = "PYTHON ERRORS:\nTraceback Info:\n" + tbinfo + "\nError Info:\n    " + \                 str(sys.exc_type)+ ": " + str(sys.exc_value) + "\n"         arcpy.AddError(pymsg)          msgs = "GP ERRORS:\n" + arcpy.GetMessages(2) + "\n"         arcpy.AddError(msgs)