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Lazy load urllib modules in saxutils #159675
Description
Feature or enhancement
import xml.sax.saxutilsFirewalld, a popular Linux firewall daemon uses xml.sax to read/write XML files, like most other consumers it does not call prepare_input_source() which is the only function which relies on the urllib imports.
Lazily loading the modules shaves off 3M memory usage (48M before -> 45M after), additionally it makes importing saxutils 3x faster but that is not super important.
Before:
[jelle@natrium][~/projects/cpython]%hyperfine -w 5 "./python -c 'import xml.sax.saxutils'"
Benchmark 1: ./python -c 'import xml.sax.saxutils' (85 runs)
mean ± σ min … max
Wall Time 34.3 ms ± 1.4 ms 32.6 ms … 42.0 ms
Memory 20.3 MiB ± 0.2 MiB 19.7 MiB … 20.6 MiB
After
[jelle@natrium][~/projects/cpython]%hyperfine -w 5 "./python -c 'import xml.sax.saxutils'"
Benchmark 1: ./python -c 'import xml.sax.saxutils' (271 runs)
mean ± σ min … max
Wall Time 10.6 ms ± 0.5 ms 9.1 ms … 11.6 ms
Memory 10.2 MiB ± 0.1 MiB 9.8 MiB … 10.4 MiB
Has this already been discussed elsewhere?
This is a minor feature, which does not need previous discussion elsewhere
Links to previous discussion of this feature:
No response
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