Gregory P. Smith added the comment:
Based on our hallway pow-wow at PyCon 2015 sprints day #1... I audited the
zipfile module to confirm our suspicions about it being large.
In current Python 3.5 head's zipfile.py module here are the things it depends
directly upon from other modules:
import io # [Py(C: _io)] io.BufferedIOBase{,readline}, io.BytesIO, io.open
import os # [Py(C: various)] os.path.*, os.getcwd, os.stat, os.listdir,
curdir, pardir,
import re # [Py(C: sre_*)] Only used for universal newlines in
ZipExtFile.readline(). Shouldn't the io module do this part for us?!?
import importlib.util # [Py] importib.util.cache_from_source() from PyZipFile
to create importable .zip files.
import sys # [C] sys.platform for creation metadata, sys.stderr for a strange
print on a DeprecationWarning.
import time # [C] time.localtime, time.time
import stat # [Py] stat.filemode, stst.S_ISDIR
import shutil # [Py] shutil.copyfileobj() from _extract_member().
import struct # [Py(C: _struct)] struct.pack(), struct.unpack(),
struct.calcsize()
import binascii # [C] binascii.crc32() only if zlib is unavailable. (store
only zip support?)
import threading # [Py] threading.RLock() in ZipFile.
import zlib, bz2, lzma are all conditional. # [C]
import warnings # [Py] conditional import to highlight legacy uses.
import py_compile # [Py] conditional import in PyZipFile for importable .zip
file creation.
Some of these are obviously shims around C extensions which could conditionally
be used directly if desired. But many others are largely implemented in
Python. Freezing all of these just to use the bloated zipfile.py within a pure
Python zipimport implementation seems like extreme overkill. Not worth the
effort.
Efforts for improved zipimport are now likely to focus on a simple C zip file
reading-only library being used by a new clean implementation of a zip importer
on top of that.
--
nosy: +gregory.p.smith
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