path: root/tutorials/module_1/latex/basics_of_python.tex

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    \author{Christian Kolset}

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\begin{document}
    
    \maketitle
    
    

    
    \hypertarget{basics-of-python}{
\section{Basics of Python}\label{basics-of-python}}

This page contains important fundamental concepts used in Python such as
syntax, operators, order or precedence and more.

    \hypertarget{syntax}{%
\subsection{Syntax}\label{syntax}}

\hypertarget{indentations-and-blocks}{%
\subsubsection{Indentations and blocks}\label{indentations-and-blocks}}

In python \emph{indentations} or the space at the start of each line,
signifies a block of code. This becomes important when we start working
with function and loops. We will talk more about this in the controls
structures tutorial.

\hypertarget{comments}{%
\subsubsection{Comments}\label{comments}}

Comments can be added to your code using the hash operator (\#). Any
text behind the comment operator till the end of the line will be
rendered as a comment. If you have an entire block of text or code that
needs to be commented out, the triple quotation marks (""") can be used.
Once used all the code after it will be considered a comment until the
comment is ended with the triple quotation marks.

    \hypertarget{operators}{%
\subsection{Operators}\label{operators}}

In python, operators are special symbols or keywords that perform
operations on values or variables. This section covers some of the most
common operator that you will see in this course.

\hypertarget{arithmetic-operators}{%
\subsubsection{Arithmetic operators}\label{arithmetic-operators}}

\begin{longtable}[]{@{}ll@{}}
\toprule
Operator & Name \\
\midrule
\endhead
+ & Addition \\
- & Subtraction \\
* & Multiplication \\
/ & Division \\
\% & Modulus \\
** & Exponentiation \\
// & Floor division \\
\bottomrule
\end{longtable}

\hypertarget{comparison-operators}{%
\subsubsection{Comparison operators}\label{comparison-operators}}

Used in conditional statements such as \texttt{if} statements or
\texttt{while} loops. Note that in the computer world a double equal
sign (\texttt{==}) means \emph{is equal to}, where as the single equal
sign assigns the variable or defines the variable to be something.

\begin{longtable}[]{@{}ll@{}}
\toprule
Operator & Name \\
\midrule
\endhead
== & Equal \\
!= & Not equal \\
\textgreater{} & Greater than \\
\textless{} & Less than \\
\textgreater= & Greater than or equal to \\
\textless= & Less than or equal to \\
\bottomrule
\end{longtable}

\hypertarget{logical-operators}{%
\subsubsection{Logical operators}\label{logical-operators}}

\begin{longtable}[]{@{}ll@{}}
\toprule
Operator & Descrription \\
\midrule
\endhead
\texttt{and} & Returns True if both statemetns are true \\
\texttt{or} & Returns True if one of the statements is true \\
\texttt{not} & Reerse the result, returns False if the result is true \\
\bottomrule
\end{longtable}

\hypertarget{identity-operators}{%
\subsubsection{Identity operators}\label{identity-operators}}

\begin{longtable}[]{@{}ll@{}}
\toprule
Operator & Description \\
\midrule
\endhead
is & Returns True if both variables are the same object \\
is not & Returns True if both variables are not the same object \\
\bottomrule
\end{longtable}

    \hypertarget{order-of-operation}{%
\subsection{Order of Operation}\label{order-of-operation}}

Similarly to the order or precedence in mathematics, different computer
languages have their own set of rules. Here is a comprehensive table of
the order of operation that python follows.

\begin{longtable}[]{@{}
  >{\raggedright\arraybackslash}p{(\columnwidth - 2\tabcolsep) * \real{0.51}}
  >{\raggedright\arraybackslash}p{(\columnwidth - 2\tabcolsep) * \real{0.49}}@{}}
\toprule
Operator & Description \\
\midrule
\endhead
\texttt{()} & Parentheses \\
\texttt{**} & Exponentiation \\
\texttt{+x} \texttt{-x} \texttt{\textasciitilde{}x} & Unary plus, unary
minus, and bitwise NOT \\
\texttt{*} \texttt{/} \texttt{//} \texttt{\%} & Multiplication,
Division, floor division, and modulus \\
\texttt{+} \texttt{-} & Addition and subtraction \\
\texttt{\textless{}\textless{}} \texttt{\textgreater{}\textgreater{}} &
Bitwise left and right shifts \\
\& & Bitwise AND \\
\^{} & Bitwise XOR \\
\textbar{} & Bitwise OR \\
\texttt{==} \texttt{!=} \texttt{\textgreater{}} \texttt{\textgreater{}=}
\texttt{\textless{}} \texttt{\textless{}=} \texttt{is} \texttt{is\ not}
\texttt{in} \texttt{not\ in} & Comparision, identity and membership
operators \\
\texttt{not} & logical NOT \\
\texttt{and} & AND \\
\texttt{or} & OR \\
\bottomrule
\end{longtable}

    \hypertarget{data-types}{%
\subsection{Data types}\label{data-types}}

Data types are different ways a computer stores data. Other data types
use fewer bits than others allowing you to better utilize your computer
memory. This is important for engineers because The most common data
types that an engineer encounters in python are numeric types. -
\texttt{int} - integer - \texttt{float} - a decimal number -
\texttt{complex} - imaginary number

The comprehensive table below show all built-in data types available in
python.

\begin{longtable}[]{@{}ll@{}}
\toprule
Category & Data Type \\
\midrule
\endhead
Text & int, float, complex \\
Sequance & list, tuple, range \\
Mapping & dict \\
Set & set, frozenset \\
Boolean & bytes, bytearray, memoryview \\
Binary & bytes, bytearray, memoryview \\
None & NoneType \\
\bottomrule
\end{longtable}

    \hypertarget{variables}{%
\subsection{Variables}\label{variables}}

A \textbf{variable} in Python is a name that stores a value, allowing
you to use and manipulate data efficiently.

\hypertarget{declaring-and-assigning-variables}{%
\paragraph{Declaring and Assigning
Variables}\label{declaring-and-assigning-variables}}

It is common in low-level computer languages to declare the datatype if
the variable. In python, the datatype is set whilst you assign it. We
assign values to variables using a single \texttt{=}.

```python

    \begin{tcolorbox}[breakable, size=fbox, boxrule=1pt, pad at break*=1mm,colback=cellbackground, colframe=cellborder]
\prompt{In}{incolor}{1}{\boxspacing}
\begin{Verbatim}[commandchars=\\\{\}]
\PY{n}{x} \PY{o}{=} \PY{l+m+mi}{33}          \PY{c+c1}{\PYZsh{} Integer}
\PY{n}{y} \PY{o}{=} \PY{l+m+mf}{3.14}        \PY{c+c1}{\PYZsh{} Float}
\PY{n}{name} \PY{o}{=} \PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{Joe}\PY{l+s+s2}{\PYZdq{}}    \PY{c+c1}{\PYZsh{} String}
\PY{n}{is\PYZus{}valid} \PY{o}{=} \PY{k+kc}{True} \PY{c+c1}{\PYZsh{} Boolean}

\PY{n+nb}{print}\PY{p}{(}\PY{n}{x}\PY{o}{*}\PY{o}{*}\PY{l+m+mi}{2}\PY{o}{+}\PY{l+m+mi}{3}\PY{o}{*}\PY{n}{y}\PY{p}{)}
\end{Verbatim}
\end{tcolorbox}

    \begin{Verbatim}[commandchars=\\\{\}]
1098.42
    \end{Verbatim}

    Change the x and y values above, re-run the cell to see what happens.

You can assign multiple variables at once:

\begin{Shaded}
\begin{Highlighting}[]
\NormalTok{a, b, c }\OperatorTok{=} \DecValTok{1}\NormalTok{, }\DecValTok{2}\NormalTok{, }\DecValTok{3}
\end{Highlighting}
\end{Shaded}

Similarly we can assign the same value to multiple variables:

\begin{Shaded}
\begin{Highlighting}[]
\NormalTok{x }\OperatorTok{=}\NormalTok{ y }\OperatorTok{=}\NormalTok{ z }\OperatorTok{=} \DecValTok{100}
\end{Highlighting}
\end{Shaded}

    \hypertarget{rules}{%
\subparagraph{Rules}\label{rules}}

\begin{itemize}
\tightlist
\item
  Must start with a letter or \texttt{\_}
\item
  Cannot start with a number
\item
  Can only contain letters, numbers, and \texttt{\_}
\item
  Case-sensitive (\texttt{Name} and \texttt{name} are different)
\end{itemize}

\hypertarget{updating-variables}{%
\paragraph{Updating Variables}\label{updating-variables}}

You can change a variable's value at any time.

\begin{Shaded}
\begin{Highlighting}[]
\NormalTok{x }\OperatorTok{=} \DecValTok{5}
\NormalTok{x }\OperatorTok{=}\NormalTok{ x }\OperatorTok{+} \DecValTok{10}  \CommentTok{\# Now x is 15}
\end{Highlighting}
\end{Shaded}

Or shorthand:

\begin{Shaded}
\begin{Highlighting}[]
\NormalTok{x }\OperatorTok{+=} \DecValTok{10}  \CommentTok{\# Same as x = x + 10}
\end{Highlighting}
\end{Shaded}

\hypertarget{variable-types-type-checking}{%
\paragraph{Variable Types \& Type
Checking}\label{variable-types-type-checking}}

Use \texttt{type()} to check a variable's type.

    \begin{tcolorbox}[breakable, size=fbox, boxrule=1pt, pad at break*=1mm,colback=cellbackground, colframe=cellborder]
\prompt{In}{incolor}{2}{\boxspacing}
\begin{Verbatim}[commandchars=\\\{\}]
\PY{n}{x} \PY{o}{=} \PY{l+m+mi}{10}
\PY{n+nb}{print}\PY{p}{(}\PY{l+s+sa}{f}\PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{ Variable x is type: }\PY{l+s+si}{\PYZob{}}\PY{n+nb}{type}\PY{p}{(}\PY{n}{x}\PY{p}{)}\PY{l+s+si}{\PYZcb{}}\PY{l+s+s1}{\PYZsq{}}\PY{p}{)}

\PY{n}{y} \PY{o}{=} \PY{l+s+s2}{\PYZdq{}}\PY{l+s+s2}{Hello}\PY{l+s+s2}{\PYZdq{}}
\PY{n+nb}{print}\PY{p}{(}\PY{l+s+sa}{f}\PY{l+s+s1}{\PYZsq{}}\PY{l+s+s1}{ Variable y is type: }\PY{l+s+si}{\PYZob{}}\PY{n+nb}{type}\PY{p}{(}\PY{n}{y}\PY{p}{)}\PY{l+s+si}{\PYZcb{}}\PY{l+s+s1}{\PYZsq{}}\PY{p}{)}
\end{Verbatim}
\end{tcolorbox}

    \begin{Verbatim}[commandchars=\\\{\}]
 Variable x is type: <class 'int'>
 Variable y is type: <class 'str'>
    \end{Verbatim}

    \hypertarget{exercise}{%
\section{Exercise}\label{exercise}}

    \begin{tcolorbox}[breakable, size=fbox, boxrule=1pt, pad at break*=1mm,colback=cellbackground, colframe=cellborder]
\prompt{In}{incolor}{ }{\boxspacing}
\begin{Verbatim}[commandchars=\\\{\}]

\end{Verbatim}
\end{tcolorbox}


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\end{document}