Merge pull request #2489 from dmitry-ganyushin/f2338-python-str-fullAPI

Added a test to write/read a python string for low-level python API

testing/adios2/bindings/python/CMakeLists.txt

@@ -20,6 +20,7 @@ if(ADIOS2_HAVE_MPI)
   add_python_mpi_test(BPWriteReadTypes)
   add_python_mpi_test(BPWriteTypesHighLevelAPI)
   add_python_mpi_test(BPWriteTypesHighLevelAPILocal)
+  add_python_mpi_test(BPWriteReadString)
   add_python_mpi_test(BPReadMultisteps)
   add_python_mpi_test(BPWriteRead2D)
   add_python_mpi_test(BPBlocksInfo)

testing/adios2/bindings/python/TestBPWriteReadString.py

@@ -0,0 +1,46 @@
+#!/usr/bin/env python
+
+#
+# Distributed under the OSI-approved Apache License, Version 2.0.  See
+# accompanying file Copyright.txt for details.
+#
+# TestBPWriteReadString.py: test writing/reading Python string type
+# in ADIOS2 File Write
+#  Created on: Oct 19, 2020
+#      Author: Dmitry Ganyushin [email protected]
+import unittest
+from mpi4py import MPI
+import adios2
+
+class TestAdiosWriteReadString(unittest.TestCase):
+
+    def test_adios_read_string(self):
+        # MPI
+        comm = MPI.COMM_WORLD
+        the_string = 'hello adios'
+        bpfilename = 'string_test.bp'
+        varname = 'mystringvar'
+        N_steps = 10
+        adios = adios2.ADIOS(comm)
+        ioWrite = adios.DeclareIO('ioWriter')
+        ad_engine = ioWrite.Open(bpfilename, adios2.Mode.Write)
+        var_mystringvar = ioWrite.DefineVariable(varname)
+        for step in range(N_steps):
+            ad_engine.BeginStep()
+            ad_engine.Put(var_mystringvar, the_string + str(step))
+            ad_engine.EndStep()
+        ad_engine.Close()
+
+        ioRead = adios.DeclareIO('ioReader')
+        ad_engine = ioRead.Open(bpfilename, adios2.Mode.Read)
+        var_read_mystringvar = ioRead.InquireVariable(varname)
+        for step in range(N_steps):
+            ad_engine.BeginStep()
+            result = ad_engine.Get(var_read_mystringvar)
+            ad_engine.EndStep()
+            self.assertEqual(result, the_string + str(step))
+        ad_engine.Close()
+
+
+if __name__ == '__main__':
+    unittest.main()