Lib/ftplib.py Netrc class should be removed.

[vincele]

BPO	6623
Nosy	@bitdancer, @berkerpeksag
Files	py3k-ftplib.py-use-before-assignment.patch: fix for the macro parsing in ftplib remove_Netrc_class.patch remove_Netrc_class2.patch: Fix to remove deprecated Netrc class. issue6623.diff

^{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/berkerpeksag'
closed_at = <Date 2014-11-01.08:52:37.284>
created_at = <Date 2009-08-01.22:25:35.480>
labels = ['type-feature', 'library']
title = 'Lib/ftplib.py Netrc class should be removed.'
updated_at = <Date 2014-11-01.08:52:37.282>
user = 'https://bugs.python.org/vincele'

bugs.python.org fields:

activity = <Date 2014-11-01.08:52:37.282>
actor = 'berker.peksag'
assignee = 'berker.peksag'
closed = True
closed_date = <Date 2014-11-01.08:52:37.284>
closer = 'berker.peksag'
components = ['Library (Lib)']
creation = <Date 2009-08-01.22:25:35.480>
creator = 'vincele'
dependencies = []
files = ['14625', '34806', '34818', '36807']
hgrepos = []
issue_num = 6623
keywords = ['patch']
message_count = 13.0
messages = ['91176', '91278', '182453', '182454', '216037', '216042', '216092', '216223', '227705', '227708', '228531', '230437', '230438']
nosy_count = 6.0
nosy_names = ['r.david.murray', 'vincele', 'python-dev', 'francismb', 'berker.peksag', 'maatt']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue6623'
versions = ['Python 3.5']

[vincele]

The 'macro_lines' list should probably be emptied upon leaving macro
parsing mode.

Simplify code by using the 'macro_name' variable as the boolean for
macro parsing mode.

Deprecated code probably should be fixed until completely removed

[vincele]

If the macro_lines is not emptied upon end of parsing a macro
definition, if there's another macro definiton it will 'inherit' the
lines from the previous one, which could very well be uncool.

The use before definition should also be fixed.

Please advise if a better fix would be to completely remove the Netrc
class from ftplib, or replace it with a compatibility wrapper that use
the netrc module.

[python-dev]

New changeset acf247d25f17 by R David Murray in branch 'default':
bpo-6623: Add explicit deprecation warning for ftplib.Netrc.
http://hg.python.org/cpython/rev/acf247d25f17

[bitdancer]

Thanks for the report.

ftplib.Netrc has been deprecated (via its doc string) since at least Python 2.4, and is no longer documented in the library reference. I've added an explicit DeprecationWarning in Python 3.4, and have altered this issue to call for its complete removal in Python 3.5.

I am not planning to fix the existing code, because IMO with deprecated code this old the chance of breaking something exceeds the chance that the bad code will do harm.

[maatt]

Created patch to remove the Netrc class and its unit tests (for Python 3.5).

[bitdancer]

This looks good, except that if we are not going to delete that test routine (and we aren't because we didn't deprecate it :) I think we should instead replace the usage of Netrc with the netrc module.

[maatt]

This patch is the same as my previous one, except instead of removing Netrc usage from the ftplib.test() function, it replaces it with the netrc.netrc object. Note that there are no existing tests for the ftplib.test() function.

Also did some very minor cleanups (bare raise is no longer valid) to get rid of warnings/errors in static analyzer.

[bitdancer]

Did you hand test it? Also, you could open a new issue to add tests for the ftplib cli, and probably improve and document it? It was designed as a test, but some people may be using it and it might even be actually useful :)

[francismb]

I've downloaded 'remove_Netrc_class2.patch' and passes the test suite, the examples on the documentation run ok and manually from the command line:

$hg tip
changeset: 92597:e29866cb6b98
tag: tip
parent: 92594:d43d4d4ebf2c
parent: 92596:54987723de99
...
$ hg status
M Lib/ftplib.py
M Lib/test/test_ftplib.py
? Modules/_testembed
$ ./python -m ftplib -d ftp.debian.org -ddebian
*cmd* 'USER anonymous'
*resp* '331 Please specify the password.'
*cmd* 'PASS ****'
*resp '230 Login successful.'
*cmd 'CWD debian'
*resp '250 Directory successfully changed.'
*cmd 'QUIT'
*resp '221 Goodbye.'

My test '.netrc' file was:
$ cat ~/.netrc
machine ftp.debian.org
login anonymous
password anonymous

The patch also looks good for me.

[bitdancer]

Great. The patch looks good to me, too.

Can someone add a What's New removal entry to the patch? (See the 3.4 What's New for a model of what removals look like in What's New.) (It would also be nice if the patch were in hg format so that we get a 'review' link, but that's not critical as I don't think we need a line-by-line review here).