Thrift modules uses 2 space indent, but python has a PEP 8 (http://www.python.org/dev/peps/pep-0008/).
PEP 008 says: "Use 4 spaces per indentation level." I think it's great idea to convert indentation of python lib and generated code to 4 space. It syncs thrift with other python modules. If nobody objects I create patch for it.
