py3: provide (del|get|has|set)attr wrappers that accepts bytes These functions will be imported automagically by our code transformer. getattr() and setattr() are widely used in our code. We wouldn't probably want to rewrite every single call of getattr/setattr. delattr() and hasattr() aren't that important, but they are functions of the same kind.

py3: check python version to enable builtins hack Future patches will add (del|get|has|set)attr wrappers.

py3: move xrange alias next to import lines Builtin functions should be available in compatibility code.

check-code: allow assignment to hasattr variable

debugobsolete: add formatter support (issue5134) It appears that computing index isn't cheap if --rev is specified. That's why "index" field is available only if --index is specified. I've named marker.flags() as "flag" because "flags" implies a list or dict in template world. Thanks to Piotr Listkiewicz for the initial implementation of this patch.

formatter: add function to convert dict to appropriate format This will be used to process key-value pairs by formatter. The default field names and format are derived from the {extras} template keyword. Tests will be added later.

check-code: make dict() pattern less invasive 'foodict(x=y)' should be allowed.

hgweb: tweak zlib chunking behavior When doing streaming compression with zlib, zlib appears to emit chunks with data after ~20-30kb on average is available. In other words, most calls to compress() return an empty string. On the mozilla-unified repo, only 48,433 of 921,167 (5.26%) of calls to compress() returned data. In other words, we were sending hundreds of thousands of empty chunks via a generator where they touched who knows how many frames (my guess is millions). Filtering out the empty chunks from the generator cuts down on overhead. In addition, we were previously feeding 8kb chunks into zlib compression. Since this function tends to emit *compressed* data after 20-30kb is available, it would take several calls before data was produced. We increase the amount of data fed in at a time to 32kb. This reduces the number of calls to compress() from 921,167 to 115,146. It also reduces the number of output chunks from 48,433 to 31,377. This does increase the average output chunk size by a little. But I don't think this will matter in most scenarios. The combination of these 2 changes appears to shave ~6s CPU time or ~3% from a server serving the mozilla-unified repo.