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-\section{Functions}\label{functions}
-
-Like a traditional mathematical functions, python functions can take an
-input, process it, and give an output. In python, the input variables
-are referred to as \emph{arguments}. Functions are blocks of code that
-is run every time it's called. This allows us to re-use code.
-
-Functions are defined by using the def keyword. Reminder: it is
-important to keep track of indentations as it signifies the end of the
-function when the indentation returns back to the same level.
-
-\subsection{Defining Functions}\label{defining-functions}
-
-\subsubsection{Simple function}\label{simple-function}
-
-A simple function with no input variable can be useful if you need to
-re-use code multiple times without having to re-write it.
-
-\begin{Shaded}
-\begin{Highlighting}[]
-    \KeywordTok{def}\NormalTok{ function\_name():}
-        \BuiltInTok{print}\NormalTok{(}\StringTok{"This is from a function"}\NormalTok{)}
-\end{Highlighting}
-\end{Shaded}
-
-\subsubsection{Defining a function with one
-input}\label{defining-a-function-with-one-input}
-
-We can pass variables through to the function to be processed as
-follows:
-
-\begin{Shaded}
-\begin{Highlighting}[]
-    \KeywordTok{def}\NormalTok{ function(x):}
-        \BuiltInTok{print}\NormalTok{(x }\OperatorTok{+} \StringTok{" is best"}\NormalTok{)}
-\end{Highlighting}
-\end{Shaded}
-
-Note input variables can be of any data type (integer, float, string,
-etc.). \#\#\# Returning values from a function If we want to calculate a
-value and pass it back to the script for further use, we can use the
-\texttt{return} keyword. Let's define a linear function that takes two
-inputs, \texttt{x} and \texttt{b}, computes the corresponding \texttt{y}
-value, and returns it so it can be used elsewhere in the code.
-
-\begin{Shaded}
-\begin{Highlighting}[]
-    \KeywordTok{def}\NormalTok{ function(x, b):}
-\NormalTok{        y }\OperatorTok{=} \DecValTok{3}\OperatorTok{*}\NormalTok{x}\OperatorTok{+}\NormalTok{b}
-        \ControlFlowTok{return}\NormalTok{ y}
-\end{Highlighting}
-\end{Shaded}
-
-For multiple output variables we can add \#\# Calling functions Now that
-we've covered defining functions we want to call the function in order
-to execute the block inside the function. To do this, we simply re-call
-the function name as follows.
-
-\begin{Shaded}
-\begin{Highlighting}[]
-\NormalTok{function(}\DecValTok{2}\NormalTok{,}\OperatorTok{{-}}\DecValTok{1}\NormalTok{)}
-\end{Highlighting}
-\end{Shaded}
-
-Note that when running this code, nothing happens. This is because we
-haven't told the computer what to do with the output. Hence, if we wish
-to store the output then we need to use the assign operator \texttt{=}.
-
-\begin{Shaded}
-\begin{Highlighting}[]
-\NormalTok{output }\OperatorTok{=}\NormalTok{ function(}\DecValTok{2}\NormalTok{,}\OperatorTok{{-}}\DecValTok{1}\NormalTok{)}
-
-\BuiltInTok{print}\NormalTok{(output)}
-\end{Highlighting}
-\end{Shaded}
-
-In case you want to return multiple output variable from a single
-function we will have\ldots{}
-
-\subsection{Summary}\label{summary}
-
-\begin{Shaded}
-\begin{Highlighting}[]
-\KeywordTok{def}\NormalTok{ function\_name(argument1, argument2, argument3):}
-\NormalTok{    output1 }\OperatorTok{=}\NormalTok{ argument1 }\OperatorTok{*}\NormalTok{ argument2 }\OperatorTok{{-}}\NormalTok{ argument3}
-\NormalTok{    output2 }\OperatorTok{=}\NormalTok{ argument2 }\OperatorTok{+}\NormalTok{ argument3}
-    \ControlFlowTok{return}\NormalTok{ output1, output2}
-
-\NormalTok{[solution1, solution2] }\OperatorTok{=}\NormalTok{ function\_name(}\DecValTok{1}\NormalTok{,}\DecValTok{2}\NormalTok{,}\DecValTok{3}\NormalTok{)}
-\end{Highlighting}
-\end{Shaded}
-
-\begin{itemize}
-\tightlist
-\item
-  \texttt{def} - defines a function. All the code that is indented
-  underneath is considered inside the function block.
-\item
-  \texttt{function\_name} - this is used to call the function block.
-\item
-  \texttt{argument1} (optional) - input variable. This is data that can
-  be pass to the function. It is possible to have multiple variables
-  separated by a comma. As well as can be omitted if the function should
-  just give you an output such as.
-\item
-  \texttt{return} (optional) - if you wish to return something to your
-  script, the return keyword is used. The keyword can be followed by an
-  output variable or a constant. For multiple output variables, separate
-  them by a comma.
-\end{itemize}