root: overwrite an existing file (closes #26)

* FIX previous 'UPDATE' option which causes problems when the hepdata-converter-ws package passes the name of an existing temporary output file.

Signed-off-by: Graeme Watt <[email protected]>

hepdata_converter/writers/root_writer.py

@@ -368,7 +368,7 @@ def _write_table(self, data_out, table):
     def _prepare_outputs(self, data_out, outputs):
         if isinstance(data_out, (str, unicode)):
             self.file_emulation = True
-            outputs.append(ROOTModule.TFile.Open(data_out, 'UPDATE'))
+            outputs.append(ROOTModule.TFile.Open(data_out, 'RECREATE'))
         # multiple tables - require directory
         elif isinstance(data_out, ROOTModule.TFile):
             outputs.append(data_out)