IPython console: "sre_constants.error: unbalanced parenthesis" while typing

[J3ronimo]

Description

What steps will reproduce the problem?

In an IPython console in Spyder, write:

from datetime import datetime
now = datetime.now

Now try to enter the following line:

datetime.isoformat(now())

What is the expected output? What do you see instead?
In my case, as soon as I type the second '(', the internal console raises an "sre_constants.error: unbalanced parenthesis".

In a standalone IPython Qt console, this works fine and the arguments list of datetime.now is shown as expected.

Version and main components

• Spyder Version: 2.3.4
• Python Version: 3.4.3
• Qt Version : 4.8.6, PyQt4 (API v2) 4.11.3 on Windows

Optional dependencies

pyflakes >=0.6.0: 0.8.1 (OK)
pep8 >=0.6 : 1.6.2 (OK)
IPython >=1.0 : 3.1.0 (OK)
zmq >=2.1.11 : 14.5.0 (OK)
pygments >=1.6 : 2.0.2 (OK)
pandas >=0.13.1 : 0.16.0 (OK)
sphinx >=0.6.6 : None (NOK)
rope >=0.9.2 : 0.9.4-1 (OK)
jedi >=0.8.1 : None (NOK)
matplotlib >=1.0: 1.4.3 (OK)
sympy >=0.7.3 : 0.7.6 (OK)
pylint >=0.25 : 1.4.3 (OK)

[Nodd]

Thanks for your report.
Is it the full text printed on the console, there is no traceback with the line numbers and so on ?

[J3ronimo]

Hi. Here's the full output it gives me:

C:\Program Files\Python\WinPython-64bit-3.4.3.2\python-3.4.3.amd64\lib\site-packages\IPython\nbformat\current.py:19: UserWarning: IPython.nbformat.current is deprecated.

- use IPython.nbformat for read/write/validate public API
- use IPython.nbformat.vX directly to composing notebooks of a particular version

  """)
Traceback (most recent call last):
  File "C:\Program Files\Python\WinPython-64bit-3.4.3.2\python-3.4.3.amd64\lib\site-packages\IPython\qt\base_frontend_mixin.py", line 138, in _dispatch
    handler(msg)
  File "C:\Program Files\Python\WinPython-64bit-3.4.3.2\python-3.4.3.amd64\lib\site-packages\spyderlib\widgets\ipython.py", line 335, in _handle_inspect_reply
    signature = self.get_signature(content)
  File "C:\Program Files\Python\WinPython-64bit-3.4.3.2\python-3.4.3.amd64\lib\site-packages\spyderlib\widgets\ipython.py", line 271, in get_signature
    signature = getsignaturefromtext(text, name)
  File "C:\Program Files\Python\WinPython-64bit-3.4.3.2\python-3.4.3.amd64\lib\site-packages\spyderlib\utils\dochelpers.py", line 180, in getsignaturefromtext
    sigs_1 = re.findall(oneline_re + '|' + multiline_re, text)
  File "C:\Program Files\Python\WinPython-64bit-3.4.3.2\python-3.4.3.amd64\lib\re.py", line 210, in findall
    return _compile(pattern, flags).findall(string)
  File "C:\Program Files\Python\WinPython-64bit-3.4.3.2\python-3.4.3.amd64\lib\re.py", line 294, in _compile
    p = sre_compile.compile(pattern, flags)
  File "C:\Program Files\Python\WinPython-64bit-3.4.3.2\python-3.4.3.amd64\lib\sre_compile.py", line 568, in compile
    p = sre_parse.parse(p, flags)
  File "C:\Program Files\Python\WinPython-64bit-3.4.3.2\python-3.4.3.amd64\lib\sre_parse.py", line 760, in parse
    p = _parse_sub(source, pattern, 0)
  File "C:\Program Files\Python\WinPython-64bit-3.4.3.2\python-3.4.3.amd64\lib\sre_parse.py", line 370, in _parse_sub
    itemsappend(_parse(source, state))
  File "C:\Program Files\Python\WinPython-64bit-3.4.3.2\python-3.4.3.amd64\lib\sre_parse.py", line 708, in _parse
    p = _parse_sub(source, state)
  File "C:\Program Files\Python\WinPython-64bit-3.4.3.2\python-3.4.3.amd64\lib\sre_parse.py", line 370, in _parse_sub
    itemsappend(_parse(source, state))
  File "C:\Program Files\Python\WinPython-64bit-3.4.3.2\python-3.4.3.amd64\lib\sre_parse.py", line 710, in _parse
    raise error("unbalanced parenthesis")
sre_constants.error: unbalanced parenthesis

[Nodd]

Thanks, it will be easier to debug !

[ccordoba12]

@blink1073 has not worked on this, I've done it, so I'll take a look at this bug :-)

[goanpeca]

Oops, my bad @blink1073 ;-)

[J3ronimo]

Thanks guys.
Was anyone able to reproduce this? I also played around with some other imported functions, but so far didn't find any where this happens in the same way...

[Nodd]

I can reproduce the problem (Linux, python3, with jedi, rope and sphinx installed)

[bilderbuchi]

I can reproduce this (and confirm it works in a standalone ipython console).
WIndows 8, Miniconda, Spyder 2.3.4, Python 3.4.2, rope, jedi, sphinx installed.

[Nodd]

Uh sorry, I can reproduce the problem (I updated my comment above).

[drafter250]

drafter250

it happens with the decimal module if I alias decimal.Decimal

import decimal
D = decimal.Decimal

as soon as you type a second open parenthesis you get the regex error unbalanced parenthesis.

(D( **kaboom!**

Anaconda 2.2 with python 2.7.9, ipython 3.0.0. on windows 7.
heres the traceback:

Traceback (most recent call last):
  File "D:\Continuum\Anaconda\lib\site-packages\IPython\qt\base_frontend_mixin.py", line 138, in _dispatch
    handler(msg)
  File "D:\Continuum\Anaconda\lib\site-packages\spyderlib\widgets\ipython.py", line 335, in _handle_inspect_reply
    signature = self.get_signature(content)
  File "D:\Continuum\Anaconda\lib\site-packages\spyderlib\widgets\ipython.py", line 271, in get_signature
    signature = getsignaturefromtext(text, name)
  File "D:\Continuum\Anaconda\lib\site-packages\spyderlib\utils\dochelpers.py", line 180, in getsignaturefromtext
    sigs_1 = re.findall(oneline_re + '|' + multiline_re, text)
  File "D:\Continuum\Anaconda\lib\re.py", line 181, in findall
    return _compile(pattern, flags).findall(string)
  File "D:\Continuum\Anaconda\lib\re.py", line 251, in _compile
    raise error, v # invalid expression
sre_constants.error: unbalanced parenthesis

[ccordoba12]

I can confirm this bug, and I think I know how to fix it :-)