Arguments tooltip wrong if def contains tuple

[tzot]

BPO	791968
Nosy	@terryjreedy, @kbkaiser, @ned-deily

^{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/kbkaiser'
closed_at = <Date 2013-07-26.20:47:04.875>
created_at = <Date 2003-08-20.15:16:18.000>
labels = ['expert-IDLE']
title = 'Arguments tooltip wrong if def contains tuple'
updated_at = <Date 2013-07-26.20:47:04.875>
user = 'https://bugs.python.org/tzot'

bugs.python.org fields:

activity = <Date 2013-07-26.20:47:04.875>
actor = 'terry.reedy'
assignee = 'kbk'
closed = True
closed_date = None
closer = None
components = ['IDLE']
creation = <Date 2003-08-20.15:16:18.000>
creator = 'tzot'
dependencies = []
files = []
hgrepos = []
issue_num = 791968
keywords = []
message_count = 9.0
messages = ['17853', '17854', '17855', '17856', '17857', '193597', '193617', '193629', '193744']
nosy_count = 5.0
nosy_names = ['terry.reedy', 'kbk', 'tzot', 'ned.deily', 'ariel_bruner']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue791968'
versions = ['Python 2.3']

[tzot]

This happens in IDLE on Windows 2000, from 2.3 EXE
installer. Type the following:

>>> def f((a,b), c):
	print a, b, c

>> f(

The tooltip shows up containing the following exact
string (but the triple quotes):
"""(.0, c)"""

[tzot]

Logged In: YES
user_id=539787

Quite fast, Neal! :)
It seems it's not exactly an IDLE bug; check ToolTip.py, line
134 (vanilla 2.3); it's the f.func_code.co_varnames that
returns this tuple:
('.0', 'c', 'a', 'b')

[tzot]

Logged In: YES
user_id=539787

I tried this:

def f((a,b), c, (d,e)): pass

and f.func_code.co_varnames is

('.0', 'c', '.4', 'a', 'b', 'd', 'e')

That means .0 and .4 are dummy placeholders for the
argument tuples. I couldn't find a direct way to know the
length of each tuple, though --unless one analyzes the first
UNPACK_SEQUENCE bytecodes of fob.func_code.co_code,
and then uses the tuple fob.func_code.co_varnames
[fob.func_code.co_argcount:] to recreate the tuples; should
we get into this trouble, or just do a regular expression
replace a la:

argText = "(%s)" % re.sub("\.\d+", "<tuple>", argText)

at line 144?

[kbkaiser]

Logged In: YES
user_id=149084

Problem still exists in 2.5 as of Rev 50739.

[kbkaiser]

Used your idea of displaying "<tuple>'

Rev 53641

[ArielBruner]

It seems like the solution has caused a different issue: now, when defining a function with factional default arguments, the <tuple> text replaces the correct values in the tooltip.

Here's an example -

>>> def f(a=0.5):
        pass
>>> f(

tooltip shows - "(a=0<tuple>)", i.e. replaces the ".5" with <tuple>.

[ned-deily]

Ariel, if you think there is a problem, please open a new issue with all the pertinent information. This issue was closed long ago.

[ArielBruner]

I will, sorry. I thought it's possible reopen an issue. Since all the relevant information is already contained here, and since the problem is with the fix to the issue, I figured it's best to reopen this one.

[terryjreedy]

If someone pushes a patch and closes the issue and the buildbots break, reopening the issue is the appropriate response. Too much later and the pool of potentially interested people will have changed. Anyway, the new issue is bpo-18539.