RNTupleWriter Class Reference

Python interface

RNTupleWriter is an interface to write RNTuples to storage.

A simple way to write an RNTuple in python is by:

• creating a model and adding fields to it
• opening an RNTupleWriter
• creating entries and filling them with data
• committing entries to the RNTuple via writer.Fill(entry)

import ROOT
 
# Create the model
model = ROOT.RNTupleModel.Create()
 
# Define the schema by adding fields to the model.
model.MakeField['int']("foo")
 
# Create a writer as a context manager
with ROOT.RNTupleWriter.Recreate(model, "myNtuple", "file.root") as writer:
    # create an entry and use it to write data to the RNTuple
    entry = writer.CreateEntry()
    for i in range(0,10):
        entry['foo'] = i
        writer.Fill(entry)
# On destruction, the writer will flush the written data to disk

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The documentation for this class was generated from the following file:

• pyzdoc/_rntuple.pyzdoc