Product Application Developers targeting finer-level control for their IO tasks for optimization should use the current full APIs. If you want to use ADIOS2 in simple use cases (*e.g.* reading a file for analysis, interactive Python, or saving some data for a small project) please refer to the :ref:`Simple Language Bindings APIs` for a flat learning curve.
The full Python APIs follow very closely the full C++11 API interface.
temperature = fh_step.read("temperature", start, count)
pressure = fh_step.read("pressure", start, count)
.. caution::
When reading in stepping mode with the for-in directive, as in the example above, use the step handler (fh_step) inside the loop rather than the global handler (fh)
7. **FlushStepsCount**: user can select how often to produce the more expensive collective metadata file in terms of steps: default is 1. Increase to reduce adios2 collective operations footprint, with the trade-off of reducing checkpoint frequency. Buffer size will increase until first steps count if MaxBufferSize is not set.
7. **MaxBufferSize**: maximum allowable buffer size (must be larger than 16Kb). If to large adios2 will throw an exception.
8. **FlushStepsCount**: user can select how often to produce the more expensive collective metadata file in terms of steps: default is 1. Increase to reduce adios2 collective operations footprint, with the trade-off of reducing checkpoint frequency. Buffer size will increase until first steps count if MaxBufferSize is not set.
