Bug#993132: python3-fife: prints "is"/"is not" used-with-a-literal warnings at install time

[The Wanderer]

Package: python3-fife
Version: 0.4.2-3
Severity: normal

Dear Maintainer,

When I installed python3-fife as a dependency from another package, I
saw the following printed in the console:


Setting up python3-fife (0.4.2-3) ...
/usr/lib/python3/dist-packages/fife/extensions/fife_settings.py:301:
SyntaxWarning: "is not" with a literal. Did you mean "!="?
  if module is not "FIFE":
/usr/lib/python3/dist-packages/fife/extensions/fife_settings.py:435:
SyntaxWarning: "is" with a literal. Did you mean "=="?
  if module is "FIFE":
/usr/lib/python3/dist-packages/fife/extensions/pychan/widgets/animationicon.py:193:
SyntaxWarning: "is not" with a literal. Did you mean "!="?
  if anim is not "":
/usr/lib/python3/dist-packages/fife/extensions/pychan/widgets/curvegraph.py:164:
SyntaxWarning: "is" with a literal. Did you mean "=="?
  if coordinates is None or len(coordinates) is 0:
/usr/lib/python3/dist-packages/fife/extensions/pychan/widgets/linegraph.py:157:
SyntaxWarning: "is" with a literal. Did you mean "=="?
  if coordinates is None or len(coordinates) is 0:
/usr/lib/python3/dist-packages/fife/extensions/pychan/widgets/pointgraph.py:157:
SyntaxWarning: "is" with a literal. Did you mean "=="?
  if coordinates is None or len(coordinates) is 0:
/usr/lib/python3/dist-packages/fife/extensions/pychan/widgets/widget.py:1038:
SyntaxWarning: "is" with a literal. Did you mean "=="?
  if len(margin) is 4:
/usr/lib/python3/dist-packages/fife/extensions/pychan/widgets/widget.py:1044:
SyntaxWarning: "is" with a literal. Did you mean "=="?
  elif len(margin) is 3:
/usr/lib/python3/dist-packages/fife/extensions/pychan/widgets/widget.py:1050:
SyntaxWarning: "is" with a literal. Did you mean "=="?
  elif len(margin) is 2:
/usr/lib/python3/dist-packages/fife/extensions/pychan/widgets/widget.py:1056:
SyntaxWarning: "is" with a literal. Did you mean "=="?
  elif len(margin) is 1:
/usr/lib/python3/dist-packages/fife/extensions/pychan/widgets/widget.py:1068:
SyntaxWarning: "is" with a literal. Did you mean "=="?
  if len(padding) is 4:
/usr/lib/python3/dist-packages/fife/extensions/pychan/widgets/widget.py:1074:
SyntaxWarning: "is" with a literal. Did you mean "=="?
  elif len(padding) is 3:
/usr/lib/python3/dist-packages/fife/extensions/pychan/widgets/widget.py:1080:
SyntaxWarning: "is" with a literal. Did you mean "=="?
  elif len(padding) is 2:
/usr/lib/python3/dist-packages/fife/extensions/pychan/widgets/widget.py:1086:
SyntaxWarning: "is" with a literal. Did you mean "=="?
  elif len(padding) is 1:
/usr/lib/python3/dist-packages/fife/extensions/serializers/xmlmap.py:640: SyntaxWarning:
"is not" with a literal. Did you mean "!="?
  if data['s_ref'] is not -1:
/usr/lib/python3/dist-packages/fife/extensions/serializers/xmlmap.py:663: SyntaxWarning:
"is not" with a literal. Did you mean "!="?
  if data['s_ref'] is not -1:
/usr/lib/python3/dist-packages/fife/extensions/serializers/xmlmap.py:686: SyntaxWarning:
"is not" with a literal. Did you mean "!="?
  if data['s_ref'] is not -1:
/usr/lib/python3/dist-packages/fife/extensions/serializers/xmlmapsaver.py:301:
SyntaxWarning: "is not" with a literal. Did you mean "!="?
  if info.getSubdivisions() is not 32:
Setting up unknown-horizons (2019.1-3) ...
/usr/lib/python3/dist-packages/horizons/extscheduler.py:72:
SyntaxWarning: "is" with a literal. Did you mean "=="?
  if obj.loops > 0 or obj.loops is -1:


I'm not sufficiently familiar with either the language or the codebase
to be sure about whether these represent harmless warnings (in which
case this bug should be "minor") or could produce actual unintended
behavior, although I think the former is more likely; however, either
way, having this output appear isn't the best user-facing appearance.

Please adjust the package such that this type of output does not appear
at the point of package installation.


-- System Information:
Debian Release: 11.0
  APT prefers testing
  APT policy: (900, 'testing'), (800, 'stable'), (500, 'testing-debug'),
(500, 'stable-security')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.10.0-8-amd64 (SMP w/12 CPU threads)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE
not set
Shell: /bin/sh linked to /usr/bin/dash
Init: sysvinit (via /sbin/init)
LSM: AppArmor: enabled

Versions of packages python3-fife depends on:
ii  libboost-filesystem1.74.0  1.74.0-9
ii  libc6                      2.31-13
ii  libfifechan0.1.5           0.1.5-2
ii  libgcc-s1                  10.2.1-6
ii  libgl1                     1.3.2-1
ii  libglew2.1                 2.1.0-4+b1
ii  libopenal1                 1:1.19.1-2
ii  libpng16-16                1.6.37-3
ii  libpython3.9               3.9.2-1
ii  libsdl2-2.0-0              2.0.14+dfsg2-3
ii  libsdl2-image-2.0-0        2.0.5+dfsg1-2
ii  libsdl2-ttf-2.0-0          2.0.15+dfsg1-1
ii  libstdc++6                 10.2.1-6
ii  libtinyxml2.6.2v5          2.6.2-4
ii  libvorbisfile3             1.3.7-1
ii  python3                    3.9.2-3
ii  zlib1g                     1:1.2.11.dfsg-2

python3-fife recommends no packages.

python3-fife suggests no packages.

-- no debconf information