Fix RPM packaging under Python 3

Refs #27631

Framework/PostInstall/CMakeLists.txt

@@ -12,7 +12,7 @@
 # ${DESTDIR}${CMAKE_INSTALL_PREFIX} but this should be evaluated at CPack time
 # so escape the $ to its written literally.
 set(PACKAGE_ROOT \$ENV{DESTDIR}\${CMAKE_INSTALL_PREFIX})
-set(EXCLUDE_REGEX ".*_template|.*port_v3")
+set(EXCLUDE_REGEX ".*_template")
 
 set(COMPILE_SCRIPT "message ( \"Byte-compiling Python in ${PACKAGE_ROOT}\")")
 set(

buildconfig/CMake/ExternalSipPyQt4.cmake

@@ -63,6 +63,8 @@ ${_lib_site_packages}
 import sys; new = sys.path[sys.__plen:]; del sys.path[sys.__plen:]; p = getattr(sys, '__egginsert', 0); sys.path[p:p] = new; sys.__egginsert = p + len(new)
 ")
 
-# Package PyQt
+# Package PyQt. We assume this is for Python 3
 install(DIRECTORY ${_lib_site_packages}/PyQt4
-        DESTINATION ${LIB_DIR})
+        DESTINATION ${LIB_DIR} 
+        PATTERN "__pycache__" EXCLUDE
+        PATTERN "port_v2" EXCLUDE)

buildconfig/CMake/LinuxPackageScripts.cmake

@@ -30,6 +30,9 @@ if ( CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT )
   set ( CMAKE_INSTALL_PREFIX /opt/mantid${CPACK_PACKAGE_SUFFIX} CACHE PATH "Install path" FORCE )
 endif()
 
+# Tell rpm to use the appropriate python executable
+set(CPACK_RPM_SPEC_MORE_DEFINE "%define __python ${PYTHON_EXECUTABLE}")
+
 # Tell rpm that this package does not own /opt /usr/share/{applications,pixmaps}
 # Required for Fedora >= 18 and RHEL >= 7
 set ( CPACK_RPM_EXCLUDE_FROM_AUTO_FILELIST_ADDITION /opt /usr/share/applications /usr/share/pixmaps )

scripts/HFIR_4Circle_Reduction/process_mask.py

@@ -4,6 +4,8 @@
 #     NScD Oak Ridge National Laboratory, European Spallation Source
 #     & Institut Laue - Langevin
 # SPDX - License - Identifier: GPL - 3.0 +
+from __future__ import print_function
+
 import math
 import numpy
 import re
@@ -35,7 +37,7 @@ def parse_mask(xml_name):
     det_range_list = re.split(',', det_list_str)
 
     for det_range in det_range_list:
-        print det_range
+        print(det_range)
 
     # int_count = 0