Formatting Python code

[Rich Shepard]

Here's an issue that's appeared twice (so far) in the document and I cannot
find the reason.

The *.lyx code in a Program Listing environment looks like this:
-----
\begin_layout Plain Layout

         self.sheet = Sheet(self.frame,
\end_layout

\begin_layout Plain Layout

                           data = [[f"Row {r},
\end_layout

\begin_layout Plain Layout

                           Column {c}
\backslash
nnewline1
\backslash
nnewline2"
\end_layout

\begin_layout Plain Layout

                           for c in range(50)]
\end_layout

\begin_layout Plain Layout

                           for r in range(500)]) 
\end_layout
-----
The same code in the *.tex file is:
         self.sheet = Sheet(self.frame,
                           data = [[f"Row {r},
                           Column {c}\nnewline1\nnewline2"
                           for c in range(50)]
                           for r in range(500)]) 
------
So why does the pdflatex *.pdf display the attached with small space symbols?

Rich
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