optparse.OptionParser:
Class attributes:
standard_option_list : [Option]
list of standard options that will be accepted by all instances
of this parser class (intended to be overridden by subclasses).
weakref.WeakValueDictionary:
Mapping class that references values weakly.
translate.misc.lru.LRUCachingDict:
Caching dictionary like object that discards the least recently
used objects when number of cached items exceeds maxsize.
translate.storage.statsdb.StatsCache:
An object instantiated as a singleton for each statsfile that
provides access to the database cache from a pool of StatsCache
objects.