[Exp PyROOT] Add TObjString pythonisations

These pythonisations include getting the length, getting string
representations and injecting comparison operators.

bindings/pyroot_experimental/PyROOT/CMakeLists.txt

@@ -21,6 +21,7 @@ set(py_sources
   ROOT/pythonization/_tobject.py
   ROOT/pythonization/_tseqcollection.py
   ROOT/pythonisation/_tstring.py
+  ROOT/pythonisation/_tobjstring.py
   ROOT/pythonization/_ttree.py
 )
 

bindings/pyroot_experimental/PyROOT/python/ROOT/pythonization/_tobjstring.py

+# Author: Enric Tejedor CERN  02/2019
+
+################################################################################
+# Copyright (C) 1995-2019, Rene Brun and Fons Rademakers.                      #
+# All rights reserved.                                                         #
+#                                                                              #
+# For the licensing terms see $ROOTSYS/LICENSE.                                #
+# For the list of contributors see $ROOTSYS/README/CREDITS.                    #
+################################################################################
+
+from ROOT import pythonization
+
+
+@pythonization()
+def pythonize_tobjstring(klass, name):
+    # Parameters:
+    # klass: class to be pythonized
+    # name: name of the class
+
+    if name == 'TObjString':
+        # `len(s)` is the length of string representation
+        klass.__len__ = lambda self: len(str(self))
+
+        # Add string representation
+        klass.__str__  = klass.GetName
+        klass.__repr__ = lambda self: "'{}'".format(self)
+
+        # Add comparison operators
+        klass.__eq__ = lambda self, o: str(self) == o
+        klass.__ne__ = lambda self, o: str(self) != o
+        klass.__lt__ = lambda self, o: str(self) <  o
+        klass.__le__ = lambda self, o: str(self) <= o
+        klass.__gt__ = lambda self, o: str(self) >  o
+        klass.__ge__ = lambda self, o: str(self) >= o
+
+    return True