pydoc crashes on a class property

[doko42]

BPO	891637
Nosy	@doko42

^{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 = None
closed_at = <Date 2004-08-17.13:26:42.000>
created_at = <Date 2004-02-06.08:44:19.000>
labels = []
title = 'pydoc crashes on a class property'
updated_at = <Date 2004-08-17.13:26:42.000>
user = 'https://github.com/doko42'

bugs.python.org fields:

activity = <Date 2004-08-17.13:26:42.000>
actor = 'doko'
assignee = 'none'
closed = True
closed_date = None
closer = None
components = ['Demos and Tools']
creation = <Date 2004-02-06.08:44:19.000>
creator = 'doko'
dependencies = []
files = []
hgrepos = []
issue_num = 891637
keywords = []
message_count = 5.0
messages = ['19926', '19927', '19928', '19929', '19930']
nosy_count = 2.0
nosy_names = ['doko', 'jlgijsbers']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue891637'
versions = ['Python 2.3']

[doko42]

[forwarded from http://bugs.debian.org/231202]

---

class foo(object): 
    __slots__ = ['_bar'] 
    bar = property(lambda (self): self._bar) 
    def __init__(self, bar): self._bar = bar 
 
f = foo(1) 
assert(f.bar == 1) 

---

removing the parenthesis around the lambda's parameter
avoids the pydoc crash. Python itself doesn't seem to
care about the parenthesis.

$ python tmp.py  # no errors
$ pydoc tmp 
Traceback (most recent call last): 
  File "/usr/bin/pydoc", line 4, in ? 
    pydoc.cli() 
  File "/usr/lib/python2.3/pydoc.py", line 2123, in cli 
    help.help(arg) 
  File "/usr/lib/python2.3/pydoc.py", line 1582, in help 
    elif request: doc(request, 'Help on %s:') 
  File "/usr/lib/python2.3/pydoc.py", line 1375, in doc 
    pager(title % desc + '\n\n' + text.document(object,
name)) 
  File "/usr/lib/python2.3/pydoc.py", line 283, in
document 
    if inspect.ismodule(object): return
self.docmodule(*args) 
  File "/usr/lib/python2.3/pydoc.py", line 990, in
docmodule 
    contents.append(self.document(value, key, name)) 
  File "/usr/lib/python2.3/pydoc.py", line 284, in
document 
    if inspect.isclass(object): return
self.docclass(*args) 
  File "/usr/lib/python2.3/pydoc.py", line 1135, in
docclass 
    lambda t: t[1] == 'property') 
  File "/usr/lib/python2.3/pydoc.py", line 1087, in
spillproperties 
    base = self.document(func, tag, mod) 
  File "/usr/lib/python2.3/pydoc.py", line 285, in
document 
    if inspect.isroutine(object): return
self.docroutine(*args) 
  File "/usr/lib/python2.3/pydoc.py", line 1177, in
docroutine 
    args, varargs, varkw, defaults =
inspect.getargspec(object) 
  File "/usr/lib/python2.3/inspect.py", line 656, in
getargspec 
    args, varargs, varkw = getargs(func.func_code) 
  File "/usr/lib/python2.3/inspect.py", line 624, in
getargs 
    remain[-1] = remain[-1] - 1 
IndexError: list index out of range

[jlgijsbers]

Logged In: YES
user_id=469548

First, note that the problem doesn't lie in properties. This
crashes as well:

foo = lambda  (bar): 1

second, Python does care about the parentheses. It just
doesn't matter when the lambda has only one argument. Using
parentheses creates a sublist instead of a parameter list,
as in the following example with normal functions:

def foo((bar, baz)): return bar
assert(foo((1, 2)) == 1)

pydoc (or rather, inspect) should still be fixed though.

[jlgijsbers]

Logged In: YES
user_id=469548

This crashes as well:

def foo((bar)): return 1

A patch is available at http://python.org/sf/1005466.

[doko42]

Logged In: YES
user_id=60903

Fixed in

• Lib/inspect.py 1.53 and 1.47.8.2
• Lib/test/test_inspect.py 1.15 and 1.12.8.3

[doko42]

Logged In: YES
user_id=60903

Fixed in

• Lib/inspect.py 1.53 and 1.47.8.2
• Lib/test/test_inspect.py 1.15 and 1.12.8.3