* Added simple tools to read/write values to/from a HDF5 file.

iofmt/hdf5.py

@@ -0,0 +1,64 @@
+#
+# wpylib.iofmt.hdf5 module
+# Created: 20150401
+# Wirawan Purwanto
+#
+"""
+HDF5 binary format support, using h5py.
+
+"""
+
+import h5py
+import numpy
+import sys
+
+
+# Quickie functions
+
+def hdf5_read_value(filename, key):
+  """Single-value read action from a file.
+  Raises KeyError if the item does not exist.
+  """
+  F = h5py.File(filename, 'r')
+  try:
+    val = F[key].value
+  except KeyError:
+    F.close()
+    raise
+  F.close()
+  return val
+
+
+def hdf5_write_value(filename, key, value):
+  """Single-value write action from a file.
+  Overwrites the existing value, if it exists.
+  Raises an exception upon error.
+  """
+  F = h5py.File(filename, 'a')
+  try:
+    if key in F:
+      del F[key]
+    F[key] = value
+  except:
+    F.close()
+    raise
+  F.close()
+
+
+def hdf5_write_values(filename, keyvals):
+  """Multiple-value write action to a file.
+  The key-value pairs are specified as a dict.
+  Overwrites the existing value, if it exists.
+  Raises an exception upon error.
+  """
+  F = h5py.File(filename, 'a')
+  try:
+    for (key,value) in keyvals.iteritems():
+      if key in F:
+        del F[key]
+      F[key] = value
+  except:
+    F.close()
+    raise
+  F.close()
+