[Python-modules-team] Bug#708305: python3-urwid: UnboundLocalError: local variable 'w' referenced before assignment

[brian m. carlson]

Package: python3-urwid
Version: 1.1.0-1
Severity: normal

I have a piece of software using urwid.  Occasionally, the following
error occurs:

Traceback (most recent call last):
  File "/home/hodgson/bin/newfol", line 1488, in <module>
    main(sys.argv[1:])
  File "/home/hodgson/bin/newfol", line 1482, in main
    start_curses()
  File "/home/hodgson/bin/newfol", line 1079, in start_curses
    loop.run()
  File "/usr/lib/python3/dist-packages/urwid/main_loop.py", line 272, in run
    self.screen.run_wrapper(self._run)
  File "/usr/lib/python3/dist-packages/urwid/raw_display.py", line 242, in run_wrapper
    return fn()
  File "/usr/lib/python3/dist-packages/urwid/main_loop.py", line 337, in _run
    self.event_loop.run()
  File "/usr/lib/python3/dist-packages/urwid/main_loop.py", line 708, in run
    self._loop()
  File "/usr/lib/python3/dist-packages/urwid/main_loop.py", line 787, in _loop
    self._watch_files[fd]()
  File "/usr/lib/python3/dist-packages/urwid/main_loop.py", line 388, in _update
    self.process_input(keys)
  File "/usr/lib/python3/dist-packages/urwid/main_loop.py", line 485, in process_input
    event, button, col, row, focus=True ):
  File "/usr/lib/python3/dist-packages/urwid/container.py", line 1144, in mouse_event
    event, button, col, row-htrim, focus )
  File "/usr/lib/python3/dist-packages/urwid/decoration.py", line 901, in mouse_event
    event, button, col, row-top, focus)
  File "/usr/lib/python3/dist-packages/urwid/container.py", line 1658, in mouse_event
    focus)
  File "/usr/lib/python3/dist-packages/urwid/container.py", line 406, in mouse_event
    self.__super.mouse_event(size, event, button, col, row, focus)
  File "/usr/lib/python3/dist-packages/urwid/container.py", line 1658, in mouse_event
    focus)
  File "/usr/lib/python3/dist-packages/urwid/decoration.py", line 664, in mouse_event
    focus)
  File "/usr/lib/python3/dist-packages/urwid/container.py", line 2171, in mouse_event
    col - x, row, focus)
  File "/usr/lib/python3/dist-packages/urwid/container.py", line 1653, in mouse_event
    if not hasattr(w, 'mouse_event'):
UnboundLocalError: local variable 'w' referenced before assignment

I don't have a reproducible testcase, but it looks like this might occur
when the for loop iterates over an empty sequence.

-- System Information:
Debian Release: jessie/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.8-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/mksh-static

Versions of packages python3-urwid depends on:
ii  libc6    2.17-1
ii  python3  3.2.3-7

python3-urwid recommends no packages.

python3-urwid suggests no packages.

-- no debconf information

-- 
brian m. carlson / brian with sandals: Houston, Texas, US
+1 832 623 2791 | http://www.crustytoothpaste.net/~bmc | My opinion only
OpenPGP: RSA v4 4096b: 88AC E9B2 9196 305B A994 7552 F1BA 225C 0223 B187
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