\documentclass[10pt,a4paper]{article}

% Packages
\usepackage{fancyhdr}           % For header and footer
\usepackage{multicol}           % Allows multicols in tables
\usepackage{tabularx}           % Intelligent column widths
\usepackage{tabulary}           % Used in header and footer
\usepackage{hhline}             % Border under tables
\usepackage{graphicx}           % For images
\usepackage{xcolor}             % For hex colours
%\usepackage[utf8x]{inputenc}    % For unicode character support
\usepackage[T1]{fontenc}        % Without this we get weird character replacements
\usepackage{colortbl}           % For coloured tables
\usepackage{setspace}           % For line height
\usepackage{lastpage}           % Needed for total page number
\usepackage{seqsplit}           % Splits long words.
%\usepackage{opensans}          % Can't make this work so far. Shame. Would be lovely.
\usepackage[normalem]{ulem}     % For underlining links
% Most of the following are not required for the majority
% of cheat sheets but are needed for some symbol support.
\usepackage{amsmath}            % Symbols
\usepackage{MnSymbol}           % Symbols
\usepackage{wasysym}            % Symbols
%\usepackage[english,german,french,spanish,italian]{babel}              % Languages

% Document Info
\author{caothucanh}
\pdfinfo{
  /Title (bc3407.pdf)
  /Creator (Cheatography)
  /Author (caothucanh)
  /Subject (BC3407 Cheat Sheet)
}

% Lengths and widths
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\addtolength{\textheight}{-1cm}
\addtolength{\hoffset}{-3cm}
\addtolength{\voffset}{-2cm}
\setlength{\tabcolsep}{0.2cm} % Space between columns
\setlength{\headsep}{-12pt} % Reduce space between header and content
\setlength{\headheight}{85pt} % If less, LaTeX automatically increases it
\renewcommand{\footrulewidth}{0pt} % Remove footer line
\renewcommand{\headrulewidth}{0pt} % Remove header line
\renewcommand{\seqinsert}{\ifmmode\allowbreak\else\-\fi} % Hyphens in seqsplit
% This two commands together give roughly
% the right line height in the tables
\renewcommand{\arraystretch}{1.3}
\onehalfspacing

% Commands
\newcommand{\SetRowColor}[1]{\noalign{\gdef\RowColorName{#1}}\rowcolor{\RowColorName}} % Shortcut for row colour
\newcommand{\mymulticolumn}[3]{\multicolumn{#1}{>{\columncolor{\RowColorName}}#2}{#3}} % For coloured multi-cols
\newcolumntype{x}[1]{>{\raggedright}p{#1}} % New column types for ragged-right paragraph columns
\newcommand{\tn}{\tabularnewline} % Required as custom column type in use

% Font and Colours
\definecolor{HeadBackground}{HTML}{333333}
\definecolor{FootBackground}{HTML}{666666}
\definecolor{TextColor}{HTML}{333333}
\definecolor{DarkBackground}{HTML}{9CA39E}
\definecolor{LightBackground}{HTML}{F8F9F8}
\renewcommand{\familydefault}{\sfdefault}
\color{TextColor}

% Header and Footer
\pagestyle{fancy}
\fancyhead{} % Set header to blank
\fancyfoot{} % Set footer to blank
\fancyhead[L]{
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
    \SetRowColor{DarkBackground}
    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
    }
\end{tabulary}
\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{BC3407 Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{caothucanh} via \textcolor{DarkBackground}{\uline{cheatography.com/182463/cs/37963/}}}
\end{tabulary}
\end{multicols}}

\fancyfoot[L]{ \footnotesize
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}caothucanh \\
  \uline{cheatography.com/caothucanh} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Not Yet Published.\\
   Updated 28th March, 2023.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
  \SetRowColor{white}
  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\begin{document}
\raggedright
\raggedcolumns

% Set font size to small. Switch to any value
% from this page to resize cheat sheet text:
% www.emerson.emory.edu/services/latex/latex_169.html
\footnotesize % Small font.

\begin{multicols*}{3}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Methods for dict}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{`len(dict\_name) \# the no. of items in this dictionary` \newline `dict\_name.clear() \# empty the dictionary` \newline `dict\_name.items() \# pairs of key value` \newline `dict\_name.keys() \# all keys in the dictionary` \newline `dict\_name.values() \# all values in the dictionary`} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Text File I/O}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{{\bf{Reading}} \newline `file\_pointer = open("data.txt", "r")` \newline `for each\_line in file\_pointer:` \newline     `print(each\_line)` \newline `file\_pointer.close()` \newline  \newline {\bf{Other Reading:}} \newline `with open("file.txt", "r") as file:` \newline     `content = file.read()` \newline     `\# f.readline(): line by line as a string` \newline     `\# f.readlines(): as a single list` \newline     `print(content)` \newline  \newline {\bf{Writing:}} \newline `\# f.write(s), f.writelines(lines) - list of string` \newline `file\_pointer = open("line.txt", "w")` \newline `data\_list = {[}"l1", "l2"{]}` \newline `for each\_line in data\_list:` \newline     `print(each\_line, file=file\_pointer)` \newline `file\_pointer.close()` \newline  \newline {\bf{Other Writing:}} \newline data\_list = {[}"l1", "l2"{]} \newline with open("data.txt", "w") as file\_pointer: \newline     for each in data\_list: \newline         \seqsplit{file\_pointer.write(each)}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{CSV File I/O}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{{\bf{CSV Reading}} \newline `import csv` \newline `data\_row = {[}'Data1', 'Data2', 'Data3'{]}` \newline `with open("data.csv", "r") as file\_pointer:` \newline     `csv\_pointer = \seqsplit{csv.reader(file\_pointer)`} \newline     `for each in csv\_pointer:` \newline         `print(each) \#type(each) = list` \newline {\bf{CSV Writing}} \newline with open("data.csv", "w") as file\_pointer: \newline     csv\_pointer = \seqsplit{csv.writer(file\_pointer)} \newline     \seqsplit{csv\_pointer.writerow(data\_row)}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{JSON File I/O}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{{\bf{JSON dump}} \newline `import json` \newline `kelvin = \{\}` \newline `kelvin{[}'Name'{]} = 'Kelvin Lee'` \newline `kelvin{[}'income'{]} = 5300` \newline `kelvin{[}'children'{]} = {[}\{'Name: 'Alice', 'age':6\}{]}` \newline  \newline `with open("profile.json","w") as write\_f:` \newline     `json.dump(kelvin, write\_f, indent=6)` \newline {\bf{JSON load}} \newline `with open("profile.json","r") as read\_f:` \newline     `kelvin = json.load(read\_file)` \newline `print(kelvin{[}"Name"{]})` \newline `for c in kelvin{[}'children'{]}:` \newline     `print(c{[}'age'{]}, c{[}'Name'{]})`} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Object File (Pickling - object -{}-\textgreater{} byte stream)}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{p{5.377cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/caothucanh_1679988669_Screenshot 2023-03-28 153050.png}}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


% That's all folks
\end{multicols*}

\end{document}