Hi. I think I have found a minor memory leak in Modules/main.c:pymain_parse_cmdline_impl. When the loop in the pymain_read_conf function in this same file calls pymain_init_cmdline_argv a 2nd time, the pymain->command buffer of wchar_t is overriden and the previously allocated memory is never freed. I haven't written any code test to reproduce this, but it can be tested easily with gdb: ``` gdb -- bin/python3 -c pass start b Modules/main.c:587 b pymain_clear_pymain c c ``` You'll see that PyMem_RawMalloc is called twice without pymain->command ever being freed in pymain_clear_pymain. I have a patch coming as PR on GitHub I'd be glad to have your feedback on this issue and my proposal for a fix. Regards.

 New changeset 35ca1820e19f81f69073f294503cdcd708fe490f by Victor Stinner (Lucas Cimon) in branch 'master': bpo-35720: Fixing a memory leak in pymain_parse_cmdline_impl() (GH-11528) https://github.com/python/cpython/commit/35ca1820e19f81f69073f294503cdcd708fe490f 

 New changeset f71e7433ebccb2e3a2665b93bb84de38f9c581c8 by Miss Islington (bot) in branch '3.7': bpo-35720: Fixing a memory leak in pymain_parse_cmdline_impl() (GH-11528) https://github.com/python/cpython/commit/f71e7433ebccb2e3a2665b93bb84de38f9c581c8 

Thanks Lucas Cimon!