QGIS - Python Error on Startup (Ubuntu 18.04)

Use the -n option.

$ iptables --help
[...]
  --numeric     -n              numeric output of addresses and ports

It is hard to be certain without more information about the overall project. However, from your example, I would not use a conditional here at all. If you do use a conditional, I would look into PGF's .is if handler, which will make things much easier.

First some keys:

\tikzset{%

We can afford to use verbose names here because the user interface won't require them at all.

  Crazymoomin circle/.pic={\draw [fill=Crazymoomin@fill] (.5,.5) circle (0.5);},
  Crazymoomin square/.pic={\draw [fill=Crazymoomin@fill] (0,0) -- (0,1) -- (1,1) -- (1,0) -- cycle;},
  Crazymoomin triangle/.pic={\draw [fill=Crazymoomin@fill] (0,0) -- (1,0) -- (0.5, 1) -- cycle;},

So that we can use simple key names in the user interface, we'll put them on a custom path, but we'll make sure that standard TikZ keys work here, too.

  /Crazymoomin/.search also={/tikz},

Switch paths.

  /Crazymoomin/.cd,

Now we can use simple names without overwriting the defaults.

  fill/.code={%

This will hold a custom colour.

    \colorlet{Crazymoomin@fill}{#1}%
  },

And a shape.

  shape/.store in=\Crazymoomin@shape,

To handle the colour/shape combo neatly, let's make colour shape a choice key.

  colour shape/.is choice,

Now for the options, which each switch to our path and set the pic shape and fill.

  colour shape/triangle/.style={/Crazymoomin/.cd, shape=triangle, fill=yellow},
  colour shape/circle/.style={/Crazymoomin/.cd, shape=circle, fill=red},
  colour shape/square/.style={/Crazymoomin/.cd, shape=square, fill=green},

no colour can just set the fill to white.

  no colour/.style={/Crazymoomin/fill=white},

Make sure we have a default for everything.

  fill=gray,
  shape=circle,
}

Now the command.

\newcommand{\TestCommand}[1][]{%
 \tikzset{%

Switch to our path.

   /Crazymoomin/.cd,

Default setting. This sets the filling colour anyway, so no colour is effectively false by default.

   colour shape=circle,

User options.

   #1,
 }%

And the pic.

 \pic {Crazymoomin \Crazymoomin@shape};
}

Then we can write, for example,

\begin{tikzpicture}
 \TestCommand[colour shape=triangle, no colour]
 \scoped[xshift=12.5mm]{\TestCommand[colour shape=circle, no colour]}
 \scoped[xshift=25mm]{\TestCommand[colour shape=square, no colour]}
 \scoped[yshift=12.5mm]{\TestCommand[colour shape=triangle]}
 \scoped[xshift=12.5mm, yshift=12.5mm]{\TestCommand[colour shape=circle]}
 \scoped[xshift=25mm, yshift=12.5mm]{\TestCommand[colour shape=square]}
\end{tikzpicture}

to produce

Obviously this is awkward because I didn't want to mess around too much with \TextCommand which doesn't have any positioning information (eek!?).

Complete code:

\documentclass[border=10pt,multi,tikz]{standalone}
\makeatletter
\tikzset{%
  Crazymoomin circle/.pic={\draw [fill=Crazymoomin@fill] (.5,.5) circle (0.5);},
  Crazymoomin square/.pic={\draw [fill=Crazymoomin@fill] (0,0) -- (0,1) -- (1,1) -- (1,0) -- cycle;},
  Crazymoomin triangle/.pic={\draw [fill=Crazymoomin@fill] (0,0) -- (1,0) -- (0.5, 1) -- cycle;},
  /Crazymoomin/.search also={/tikz},
  /Crazymoomin/.cd,
  fill/.code={%
    \colorlet{Crazymoomin@fill}{#1}%
  },
  shape/.store in=\Crazymoomin@shape,
  colour shape/.is choice,
  colour shape/triangle/.style={/Crazymoomin/.cd, shape=triangle, fill=yellow},
  colour shape/circle/.style={/Crazymoomin/.cd, shape=circle, fill=red},
  colour shape/square/.style={/Crazymoomin/.cd, shape=square, fill=green},
  no colour/.style={/Crazymoomin/fill=white},
  fill=gray,
  shape=circle,
}
\newcommand{\TestCommand}[1][]{%
 \tikzset{%
   /Crazymoomin/.cd,
   colour shape=circle,
   #1,
 }%
 \pic {Crazymoomin \Crazymoomin@shape};
}
\makeatother
\begin{document}
\begin{tikzpicture}
 \TestCommand[colour shape=triangle, no colour]
 \scoped[xshift=12.5mm]{\TestCommand[colour shape=circle, no colour]}
 \scoped[xshift=25mm]{\TestCommand[colour shape=square, no colour]}
 \scoped[yshift=12.5mm]{\TestCommand[colour shape=triangle]}
 \scoped[xshift=12.5mm, yshift=12.5mm]{\TestCommand[colour shape=circle]}
 \scoped[xshift=25mm, yshift=12.5mm]{\TestCommand[colour shape=square]}
\end{tikzpicture}
\end{document}

You can use osslsigncode for this. It’s not available in your version of Ubuntu, only in 16.10 and later; but it’s easy to build.

To verify a signature, run it as

osslsigncode verify filetoverify