zipapp module should support compression

[zmwangx]

BPO	31638
Nosy	@pfmoore, @merwok, @zmwangx
PRs	#3819

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/pfmoore'
closed_at = <Date 2017-09-29.17:37:11.919>
created_at = <Date 2017-09-29.11:12:16.606>
labels = ['3.7', 'type-feature', 'library']
title = 'zipapp module should support compression'
updated_at = <Date 2017-09-29.17:37:11.919>
user = 'https://github.com/zmwangx'

bugs.python.org fields:

activity = <Date 2017-09-29.17:37:11.919>
actor = 'paul.moore'
assignee = 'paul.moore'
closed = True
closed_date = <Date 2017-09-29.17:37:11.919>
closer = 'paul.moore'
components = ['Library (Lib)']
creation = <Date 2017-09-29.11:12:16.606>
creator = 'zmwangx'
dependencies = []
files = []
hgrepos = []
issue_num = 31638
keywords = ['patch', 'needs review']
message_count = 3.0
messages = ['303323', '303343', '303345']
nosy_count = 3.0
nosy_names = ['paul.moore', 'eric.araujo', 'zmwangx']
pr_nums = ['3819']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue31638'
versions = ['Python 3.7']

[zmwangx]

Currently (up to 3.7.0a1) archives generated by the zipapp module are uncompressed, which are unnecessarily large for large projects. It's easy to add deflate compression support, and Python loads compressed archives just fine.

I already have a patch available. I'll submit a PR soon.

[pfmoore]

Definitely. The reason it uses uncompressed files is simply an oversight on my part - I hadn't realised the default for zipfile was uncompressed.

[pfmoore]

New changeset d87b105 by Paul Moore (Zhiming Wang) in branch 'master':
bpo-31638: Add compression support to zipapp (GH-3819)
d87b105