Hello Jeff, I did complete my review for Pythonization in chapter 6. Here are my comments: 1- for the function MPI_Group_range_incl: - missing space in ranges(3,n) (p262, l20) => should be ranges(3, n) 2-for the function MPI_Group_range_excl: - missing space in ranges(3,n) (p263, l20/21) => should be ranges(3, n) 3- for the function MPI_Comm_rank: the word "of" is missing (p265, l39) "in the group comm" should be "in the group OF comm" in the description of the parameter 4- for the function MPI_Intercomm_create: - no hyphen for newintercomm param (p293, l1/2) - for F binding: NEWINTERCOMM should be under LOCAL_COMM (p293,l 31) 5- For the function MPI_Intercomm_merge: position of Figure 6.3 is not optimal (p 294) 6- for the function MPI_Comm_create_keyval: - no hyphen for extra_state param (p299, l11/12) 7- for the function MPI_Win_create_keyval: - put "C binding" on the next page (p304, l48) 8- for the function MPI_Win_set_attr: - put "F08 binding" on the next page (p306, l48) 9- for the function MPI_Type_free_keyval: - put "C binding" on the next page (p309, l48) I don't know if sending you this message is the right way to do this. Best Guillaume