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**********************************
Transition from old API to new API
**********************************
A python script using the high-level API of 2.9 and earlier needs to be modified to work with 2.10 and later.
- adios2.open() is replaced with adios2.Stream(), and does not have 4th and 5th optional arguments for external xml and IO name.
- the ``for in file`` is replaced with ``for _ in file.steps()`` but it works for both writing (by specifying the number of output steps) and reading (for the number of available steps in a stream/file).
.. code-block:: python
# OLD API
import adios2
# NEW API
from adios2 import Adios, Stream
# NEW API: this still works
import adios2
# OLD API
fr = adios2.open(args.instream, "r", mpi.comm_app,"adios2.xml", "SimulationOutput")
# NEW API
adios = Adios("adios2.xml", mpi.comm_app)
io = adios.declare_io("SimulationOutput")
fr = Stream(io, args.instream, "r", mpi.comm_app)
# OLD API
for fr_step in fr:
fr_step....
# NEW API 1
for _ in fr.steps():
fr....
# NEW API 2
for fr_step in fr.steps():
fr_step....
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