Python bindings and tests

Author: franzpoeschel

src/binding/python/Series.cpp

@@ -80,14 +80,18 @@ void init_Series(py::module &m) {
 
     py::class_<Series, Attributable>(m, "Series")
 
-        .def(py::init<std::string const&, Access, std::string const &>(),
-            py::arg("filepath"), py::arg("access"), py::arg("options") = "{}")
+        .def(py::init<std::string const&, Access, std::string const &, bool>(),
+            py::arg("filepath"),
+            py::arg("access"),
+            py::arg("options") = "{}",
+            py::arg("parse_lazily") = false)
 #if openPMD_HAVE_MPI
         .def(py::init([](
                  std::string const& filepath,
                  Access at,
                  py::object &comm,
-                 std::string const& options){
+                 std::string const& options,
+                 bool parseLazily){
             //! TODO perform mpi4py import test and check min-version
             //!       careful: double MPI_Init risk? only import mpi4py.MPI?
             //!       required C-API init? probably just checks:
@@ -133,12 +137,13 @@ void init_Series(py::module &m) {
                                          "(Mismatched MPI at compile vs. runtime?)");
             }
 
-            return new Series(filepath, at, *mpiCommPtr, options);
+            return new Series(filepath, at, *mpiCommPtr, options, parseLazily);
         }),
             py::arg("filepath"),
             py::arg("access"),
             py::arg("mpi_communicator"),
-            py::arg("options") = "{}"
+            py::arg("options") = "{}",
+            py::arg("parse_lazily") = false
         )
 #endif
 

test/python/unittest/API/APITest.py

@@ -1634,7 +1634,8 @@ def makeIteratorRoundTrip(self, backend, file_ending):
         read = io.Series(
             "../samples/unittest_serialIterator." + file_ending,
             io.Access_Type.read_only,
-            jsonConfig
+            jsonConfig,
+            parse_lazily=True
         )
         for it in read.read_iterations():
             lastIterationIndex = it.iteration_index
@@ -1682,9 +1683,11 @@ def makeAvailableChunksRoundTrip(self, ext):
 
         read = io.Series(
             name,
-            io.Access_Type.read_only
+            io.Access_Type.read_only,
+            parse_lazily=True
         )
 
+        read.iterations[0].open()
         chunks = read.iterations[0].meshes["E"]["x"].available_chunks()
         chunks = sorted(chunks, key=lambda chunk: chunk.offset)
         for chunk in chunks: