dropped python 2.7 support

Author: sy-c

CMakeLists.txt

@@ -73,11 +73,6 @@ if(NOT APPLE)
   find_package(Python3 3.6 COMPONENTS Interpreter Development)
   if(Python3_FOUND)
     set(boost_python_component "python${Python3_VERSION_MAJOR}${Python3_VERSION_MINOR}")
-  else()
-    # Backwards compatible. Can be removed once the Python3 recipe is stable
-    message(WARNING "Python 3 was not found: falling back to Python 2")
-    find_package(Python2 2.7 COMPONENTS Development REQUIRED)
-    set(boost_python_component "python27")
   endif()
 endif()
 
@@ -99,7 +94,6 @@ target_sources(ALF PRIVATE
   src/AlfServer.cxx
   src/DimServices/DimServices.cxx
   src/DimServices/ServiceNames.cxx
-  $<$<BOOL:${Python2_FOUND}>:src/PythonInterface.cxx>
   $<$<BOOL:${Python3_FOUND}>:src/PythonInterface.cxx>
 )
 
@@ -116,8 +110,6 @@ set(LINK_LIBS
     AliceO2::ReadoutCard
     AliceO2::Common
     Boost::boost
-    $<$<BOOL:${Python2_FOUND}>:Boost::python27>
-    $<$<BOOL:${Python2_FOUND}>:Python2::Python>
     $<$<BOOL:${Python3_FOUND}>:Boost::python${Python3_VERSION_MAJOR}${Python3_VERSION_MINOR}>
     $<$<BOOL:${Python3_FOUND}>:Python3::Python>
 )