lsprof: support PyPy (issue4573) PyPy's _lsprof module doesn't export a "profiler_entry" symbol. This patch treats the symbol as optional and falls back to verifying the attribute is present on the first entry in the collected data as part of validation. There is a chance not every entry will contain the requested sort attribute. But, this patch does unbust lsprof on PyPy for the hg commands I've tested, so I assume it is sufficient. It's certainly better than the ImportError we encountered before. As part of the import refactor, I snuck in the addition of absolute_import.