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You get that result because in the string you want to render as the label, '$\tilde{b}$', Python recognizes \t as a special character: a horizontal tab.

It is not the only special character. Another prominent example is \n, which represents a line break. The complete list of special characters can be found in section "String and Bytes literals" of the Python Language Reference.

Section "Strings" in the Python Tutorial notes:

If you don’t want characters prefaced by \ to be interpreted as special characters, you can use raw strings by adding an r before the first quote:

So you get the desired output if instead of

In your solution add ~ with parentheses to lambda function:

• plotly examples are quite often portable code (easily refactored to R, JS or python)
• structure code in more pythonic way and it becomes obvious how to achieve what you want

Because the user could have shadowed it with an alias or function, and using builtin bypasses those, but isn't completely portable to old shells.

There is also an error happening earlier on:

It seems that I needed to use "com.lightbend.akka" %% "akka-stream-alpakka-csv" % "2.0.2" instead of "com.lightbend.akka" %% "akka-stream-alpakka-reference" % "2.0.2".

OK, you are using this example from the plugin source code repository. Why didn't you just say so and link to it? You made it look as if you created the sample by yourself. I found it and also the project/plugins.sbt which you did not post here. Like I told you before in our chat, I am a Scala noob, I never used it in my whole life and had no idea that a file was missing. That cost me a lot of time. Why did you post an incomplete sample project here instead of publishing it on GitHub like I asked you to? Then I could just have cloned the project and run it. Not until I found the sample code online, did I realise that yours was incomplete.

Furthermore, my IDE IntelliJ IDEA cannot import the sample project, there must be some kind of bug in the current version. I can only compile and run from sbt shell. There, I could finally reproduce your problem.

Actually, the explanation is quite simple: The plugin is outdated and ought to be updated ASAP. It depends on AspectJ Compiler Tools 1.8.10 which only supports Java 8. It is not even the most recent 1.8 release, that should be 1.8.13. Also, the plugin exports AspectJ Runtime 1.8.10 as a runtime dependency to projects using the plugin. See also:

• https://github.com/sbt/sbt-aspectj/blob/8ff3a1ad4224934dabe222205eb89c985670f240/build.sbt#L7
• https://github.com/sbt/sbt-aspectj/blob/8ff3a1ad4224934dabe222205eb89c985670f240/src/main/scala/com/lightbend/sbt/SbtAspectj.scala#L30

As long as you compile and run your project on JDK 1.8, everything is fine. If you use a more recent JDK, the solution is to override the dependencies. Put this into project/plugins.sbt:

It fails because you are running this command from folder that is not an sbt project. As you can see in your error:

The proper way to do this is using RegEx, But a smiple soloution for this case: