Serhiy Storchaka added the comment:
Microbenchmark for caching docstrings:
$ ./python -m perf timeit -s "from collections import namedtuple; names =
['field%d' % i for i in range(1000)]" -- "namedtuple('A', names)"
With sys.intern(): Mean +- std dev: 3.57 ms +- 0.05 ms
With Python-level caching: Mean +- std dev: 3.25 ms +- 0.05 ms
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