\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{yunshu (xys)}
\pdfinfo{
  /Title (python.pdf)
  /Creator (Cheatography)
  /Author (yunshu (xys))
  /Subject (Python Cheat Sheet)
}

% Lengths and widths
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\addtolength{\hoffset}{-3cm}
\addtolength{\voffset}{-2cm}
\setlength{\tabcolsep}{0.2cm} % Space between columns
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\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}{D40000}
\definecolor{LightBackground}{HTML}{FCEFEF}
\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{Python Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{yunshu (xys)} via \textcolor{DarkBackground}{\uline{cheatography.com/130138/cs/25798/}}}
\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}yunshu (xys) \\
  \uline{cheatography.com/xys} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 20th December, 2020.\\
   Updated 20th December, 2020.\\
   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{1.84149 cm} x{3.13551 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Basics}}  \tn
% Row 0
\SetRowColor{LightBackground}
abs() & absolute value \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
hash() & hash value \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
set() & creat a Set object \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
all() & True if all elements are true \tn 
% Row Count 5 (+ 2)
% Row 4
\SetRowColor{LightBackground}
any() & True if any element is true \tn 
% Row Count 7 (+ 2)
% Row 5
\SetRowColor{white}
min() & return minimum \tn 
% Row Count 8 (+ 1)
% Row 6
\SetRowColor{LightBackground}
max() & return maximum \tn 
% Row Count 9 (+ 1)
% Row 7
\SetRowColor{white}
divmod(a,b) & return (a//b,a\%b) \tn 
% Row Count 10 (+ 1)
% Row 8
\SetRowColor{LightBackground}
hex() & hexadecimal \tn 
% Row Count 11 (+ 1)
% Row 9
\SetRowColor{white}
oct() & octal \tn 
% Row Count 12 (+ 1)
% Row 10
\SetRowColor{LightBackground}
bin() & binary \tn 
% Row Count 13 (+ 1)
% Row 11
\SetRowColor{white}
dir() & return all attributes of obj \tn 
% Row Count 15 (+ 2)
% Row 12
\SetRowColor{LightBackground}
sorted({\emph{iter}}) & return a new sorted list from iter \tn 
% Row Count 17 (+ 2)
% Row 13
\SetRowColor{white}
open(path,mode) & open a file \tn 
% Row Count 19 (+ 2)
% Row 14
\SetRowColor{LightBackground}
int() & creat an Int object \tn 
% Row Count 20 (+ 1)
% Row 15
\SetRowColor{white}
str() & return the string form \tn 
% Row Count 21 (+ 1)
% Row 16
\SetRowColor{LightBackground}
float() & creat a float obj \tn 
% Row Count 22 (+ 1)
% Row 17
\SetRowColor{white}
list() & creat a List obj \tn 
% Row Count 23 (+ 1)
% Row 18
\SetRowColor{LightBackground}
\seqsplit{isinstance(obj},class) & check if obj belongs to class \tn 
% Row Count 25 (+ 2)
% Row 19
\SetRowColor{white}
ord(c) & return ASCII of c \tn 
% Row Count 26 (+ 1)
% Row 20
\SetRowColor{LightBackground}
chr(n) & return char of ASCII \tn 
% Row Count 27 (+ 1)
% Row 21
\SetRowColor{white}
sum(iter) & return sum of iter \tn 
% Row Count 28 (+ 1)
% Row 22
\SetRowColor{LightBackground}
filter(pred,iter) & return list of elements meeting pred \tn 
% Row Count 30 (+ 2)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{5.377cm}{x{1.84149 cm} x{3.13551 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Basics (cont)}}  \tn
% Row 23
\SetRowColor{LightBackground}
pow(a,b) & return a\textasciicircum{}b \tn 
% Row Count 1 (+ 1)
% Row 24
\SetRowColor{white}
callable(obj) & True if obj is callable \tn 
% Row Count 2 (+ 1)
% Row 25
\SetRowColor{LightBackground}
type() & return type of obj \tn 
% Row Count 3 (+ 1)
% Row 26
\SetRowColor{white}
zip() & zip('ab','12') -\textgreater{} a1,b2 \tn 
% Row Count 5 (+ 2)
% Row 27
\SetRowColor{LightBackground}
map(f,xs) & return ys = f(xs) \tn 
% Row Count 6 (+ 1)
% Row 28
\SetRowColor{white}
round() & rounded number \tn 
% Row Count 7 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.4885 cm} x{2.4885 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{thread}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{import threading} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
t = \seqsplit{threading.Thread(target=fun}, args = iter,name=thread name) & creat a thread \tn 
% Row Count 5 (+ 4)
% Row 2
\SetRowColor{LightBackground}
t.start() & start thread t \tn 
% Row Count 6 (+ 1)
% Row 3
\SetRowColor{white}
t.join() & join thread t, other threads waiting until t finishes \tn 
% Row Count 9 (+ 3)
% Row 4
\SetRowColor{LightBackground}
lock = threading.Lock() & create a lock \tn 
% Row Count 11 (+ 2)
% Row 5
\SetRowColor{white}
lock.acquire() & current thread acquires the lock \tn 
% Row Count 13 (+ 2)
% Row 6
\SetRowColor{LightBackground}
lock.release() & current thead release lock \tn 
% Row Count 15 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.38896 cm} x{2.58804 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{str-library}}  \tn
% Row 0
\SetRowColor{LightBackground}
s1+s2 & string concatenation \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
s*5 & repeating 5 times of s \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
{[}0{]} or {[}:{]} & subscription and slice \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
in/not in & member test \tn 
% Row Count 6 (+ 1)
% Row 4
\SetRowColor{LightBackground}
r/R & no escape: r'\textbackslash{}n' = '\textbackslash{}n' (no new line) \tn 
% Row Count 8 (+ 2)
% Row 5
\SetRowColor{white}
\% & string formatting (\%d \textless{}=\textgreater{} integer) ) \tn 
% Row Count 10 (+ 2)
% Row 6
\SetRowColor{LightBackground}
s.capitalize() & capitalize the first char in s \tn 
% Row Count 12 (+ 2)
% Row 7
\SetRowColor{white}
s.count(x,beg=0,end=len(s))) & count the number of occurence of x in s \tn 
% Row Count 14 (+ 2)
% Row 8
\SetRowColor{LightBackground}
s.endswith(suffix,beg=0,end=len(s)) & check if s ends with suffix (within the given area) \tn 
% Row Count 17 (+ 3)
% Row 9
\SetRowColor{white}
\seqsplit{s.startswith(prefix},beg=0,end=len(s)) & check if s starts with x \tn 
% Row Count 19 (+ 2)
% Row 10
\SetRowColor{LightBackground}
\seqsplit{s.expandtabs(tabsize=8)} & expand the "tab" in s to space \tn 
% Row Count 21 (+ 2)
% Row 11
\SetRowColor{white}
s.find(x,beg=0,end=len(s)) & return start index of x  in s if x is in s, else -1 \tn 
% Row Count 24 (+ 3)
% Row 12
\SetRowColor{LightBackground}
s.index(x,beg=0,end=len(s)) & similar to find, but raises an exception if x is not in s \tn 
% Row Count 27 (+ 3)
% Row 13
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{s.rindex()} \tn 
% Row Count 28 (+ 1)
% Row 14
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{s.rfind()} \tn 
% Row Count 29 (+ 1)
% Row 15
\SetRowColor{white}
s.isalnum() & True if every char(\textgreater{}=1) in s is number or letter \tn 
% Row Count 32 (+ 3)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{5.377cm}{x{2.38896 cm} x{2.58804 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{str-library (cont)}}  \tn
% Row 16
\SetRowColor{LightBackground}
s.isalpha() & True if every char(\textgreater{}=1) in s is letter \tn 
% Row Count 2 (+ 2)
% Row 17
\SetRowColor{white}
s.isdigit() & True if every char(\textgreater{}=1) in s is number \tn 
% Row Count 4 (+ 2)
% Row 18
\SetRowColor{LightBackground}
s.isnumeric() & True if all characters in the string are numeric(\textgreater{}=1) \tn 
% Row Count 7 (+ 3)
% Row 19
\SetRowColor{white}
s.isdecimal() & Return True if the string is a decimal string(\textgreater{}=1), False otherwise. \tn 
% Row Count 11 (+ 4)
% Row 20
\SetRowColor{LightBackground}
s.isspace() & True if s only contains space \tn 
% Row Count 13 (+ 2)
% Row 21
\SetRowColor{white}
s.join() & Concatenate any number of strings using s as delimiter \tn 
% Row Count 16 (+ 3)
% Row 22
\SetRowColor{LightBackground}
s.upper() & all to uppercase \tn 
% Row Count 17 (+ 1)
% Row 23
\SetRowColor{white}
s.isupper() & True if all cased chars are supercase(\textgreater{}=1) \tn 
% Row Count 20 (+ 3)
% Row 24
\SetRowColor{LightBackground}
s.lower() & all to lowercase \tn 
% Row Count 21 (+ 1)
% Row 25
\SetRowColor{white}
s.islower() & True if all cased chars are lowercase(\textgreater{}=1) \tn 
% Row Count 24 (+ 3)
% Row 26
\SetRowColor{LightBackground}
s.lstrip() & return a new string leading whitespace removed \tn 
% Row Count 27 (+ 3)
% Row 27
\SetRowColor{white}
s.strip() & Return a copy of the string with leading and trailing whitespace removed \tn 
% Row Count 31 (+ 4)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{5.377cm}{x{2.38896 cm} x{2.58804 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{str-library (cont)}}  \tn
% Row 28
\SetRowColor{LightBackground}
s.rstrip() & Return a copy of the string with trailing whitespace removed. \tn 
% Row Count 4 (+ 4)
% Row 29
\SetRowColor{white}
s.split(del,maxsplit = s.count(del)) & Return a list of the words in the string, using del as the delimiter string \tn 
% Row Count 8 (+ 4)
% Row 30
\SetRowColor{LightBackground}
\seqsplit{s.splitlines(keepends)} & Return a list of the lines in the string, breaking at line boundaries. Line breaks are not included in the resulting list unless keepends is given and true. \tn 
% Row Count 16 (+ 8)
% Row 31
\SetRowColor{white}
s.swapcase() & lower \textless{}-\textgreater{} upper \tn 
% Row Count 17 (+ 1)
% Row 32
\SetRowColor{LightBackground}
s.titile() & titilization: all words are capitalized \tn 
% Row Count 19 (+ 2)
% Row 33
\SetRowColor{white}
s.replace(old,new,{\emph{max}}) & Return a copy with all occurrences of substring old replaced by new \tn 
% Row Count 23 (+ 4)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.09034 cm} x{2.88666 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{list}}  \tn
% Row 0
\SetRowColor{LightBackground}
{[}1,2,3{]}+{[}4,5,6{]} & {[}1,2,3,4,5,6{]} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
arr = {[}0{]}*10 & Array arr = new Array{[}10{]} \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
l.append(obj) & append obj at end of l \tn 
% Row Count 4 (+ 1)
% Row 3
\SetRowColor{white}
l.count(obj) & count occurence number of obj in l \tn 
% Row Count 6 (+ 2)
% Row 4
\SetRowColor{LightBackground}
l.extend({\emph{iter}}) & Extend list by appending elements from the iterable \tn 
% Row Count 9 (+ 3)
% Row 5
\SetRowColor{white}
l.index(obj,beg=0,end=len(l)) & Return first index of value. Raises ValueError if the value is not present \tn 
% Row Count 13 (+ 4)
% Row 6
\SetRowColor{LightBackground}
l.remove(obj) & Remove first occurrence of value. Raises ValueError if the value is not present \tn 
% Row Count 17 (+ 4)
% Row 7
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{l.sort(cmp=None,key=None,reverse=False)} \tn 
% Row Count 18 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.69218 cm} x{3.28482 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{tuple}}  \tn
% Row 0
\SetRowColor{LightBackground}
(1,2)+(3,4) & (1,2,3,4) \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
(0)*10 & (0,0,0,0,0,0,0,0,0,0) \tn 
% Row Count 2 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.84149 cm} x{3.13551 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{dict (hashtable)}}  \tn
% Row 0
\SetRowColor{LightBackground}
d = \{'age':20\} & create a dict \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
d{[}'age'{]} = 30 & add/update value \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
d.pop(key) & deleting key and value \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
d.clear() & create a dict \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
d.get(key,default=None) & get value by key, or default if key not exists \tn 
% Row Count 6 (+ 2)
% Row 5
\SetRowColor{white}
\seqsplit{d.has\_key(key)} & True if d has key \tn 
% Row Count 7 (+ 1)
% Row 6
\SetRowColor{LightBackground}
d.items() & a list of (key,value) of d \tn 
% Row Count 9 (+ 2)
% Row 7
\SetRowColor{white}
d.update(d2) & updating (k,v) of d2 to d1 \tn 
% Row Count 11 (+ 2)
% Row 8
\SetRowColor{LightBackground}
d.pop(key) & delete and return the value pointed by the key \tn 
% Row Count 13 (+ 2)
% Row 9
\SetRowColor{white}
d.popitem() & delete and return a pair of (k,v) randomly \tn 
% Row Count 15 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{dict features: \newline 1. fast for searching and inserting, which won't be affected by the number of keys \newline 2. occupy a lot of memory}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.9908 cm} x{2.9862 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{set}}  \tn
% Row 0
\SetRowColor{LightBackground}
s = set({[}1,2,3{]}) & creat a set \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
s.add(4) & adding element \tn 
% Row Count 3 (+ 1)
% Row 2
\SetRowColor{LightBackground}
s.remove(4) & deleting element \tn 
% Row Count 4 (+ 1)
% Row 3
\SetRowColor{white}
s1 \& s2 & intersection of sets \tn 
% Row Count 5 (+ 1)
% Row 4
\SetRowColor{LightBackground}
s1 | s2 & union of sets \tn 
% Row Count 6 (+ 1)
% Row 5
\SetRowColor{white}
s.clear() & clear the set \tn 
% Row Count 7 (+ 1)
% Row 6
\SetRowColor{LightBackground}
s.pop() & remove one element randomly \tn 
% Row Count 9 (+ 2)
% Row 7
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{\seqsplit{s1.symmetric\_difference(s2)}} \tn 
% Row Count 10 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.83689 cm} x{2.14011 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{copy}}  \tn
% Row 0
\SetRowColor{LightBackground}
a = li & a: new pointer to li \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
a = li{[}:{]} & first level copy \tn 
% Row Count 3 (+ 1)
% Row 2
\SetRowColor{LightBackground}
a = list(li) & first level copy \tn 
% Row Count 4 (+ 1)
% Row 3
\SetRowColor{white}
a = copy.copy(li) & first level copy \tn 
% Row Count 5 (+ 1)
% Row 4
\SetRowColor{LightBackground}
a = copy.deepcopy(li) & recursive copy \tn 
% Row Count 7 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{import copy \newline li = {[}1,2,3,{[}4,5{]}{]}}  \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}{list generation expression}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{{[}a+b for a in list1 for b in list2{]}} \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}{@property}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{class Student(object): \newline   @property \newline   def {\bf{score}}(self): return 100 \newline  \newline   @{\bf{score}}.setter \newline   def {\bf{score}}(self,value): pass} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{the three names (score) should be consistent}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.18988 cm} x{2.78712 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{regular expression}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{import re} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
re.match(pattern,string,{\emph{flags}}) & Try to apply the pattern at the start of the string, returning a Match object, or None if no match was found. \tn 
% Row Count 6 (+ 5)
% Row 2
\SetRowColor{LightBackground}
\seqsplit{re.search(pattern},string,{\emph{flag}}) & Scan through string looking for a match to the pattern, returning a Match object, or None if no match was found. \tn 
% Row Count 12 (+ 6)
% Row 3
\SetRowColor{white}
\seqsplit{matchObject.span()} & return (a,b) where a is the start inex and b is the end index of the matching \tn 
% Row Count 16 (+ 4)
% Row 4
\SetRowColor{LightBackground}
\seqsplit{re.compile(pattern},{\emph{flag}}) & Compile a regular expression pattern, returning a Pattern object, which can be used in re.match/re.search \tn 
% Row Count 21 (+ 5)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.39356 cm} x{3.58344 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{parameters}}  \tn
% Row 0
\SetRowColor{LightBackground}
\seqsplit{func(*args)} & accepting any parameters \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
func(**kw) & accepting only key word parameters \tn 
% Row Count 4 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{closure}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{def \seqsplit{create\_myFunc\_at\_runtime(*runtime\_para):} \newline   def myFunc(x): \newline     (return x + runtime\_para) \newline     pass \newline   return myFunc} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.43873 cm} x{2.53827 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Build A Class: Test}}  \tn
% Row 0
\SetRowColor{LightBackground}
\_\_slots\_\_ = ('name','age') & this class have only 2 attributes now: name \& age \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
\_\_eq\_\_(self,obj) & override "==" operator \tn 
% Row Count 5 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\_\_ne\_\_(self,obj) & != \tn 
% Row Count 7 (+ 2)
% Row 3
\SetRowColor{white}
\_\_le\_\_(self,o) & \textless{}= \tn 
% Row Count 8 (+ 1)
% Row 4
\SetRowColor{LightBackground}
\_\_ge\_\_(self,o) & \textgreater{}= \tn 
% Row Count 9 (+ 1)
% Row 5
\SetRowColor{white}
\_\_lt\_\_(self,o) & \textless{} \tn 
% Row Count 10 (+ 1)
% Row 6
\SetRowColor{LightBackground}
\_\_gt\_\_(self,o) & \textgreater{} \tn 
% Row Count 11 (+ 1)
% Row 7
\SetRowColor{white}
\_\_str\_\_(self) & override str() \tn 
% Row Count 12 (+ 1)
% Row 8
\SetRowColor{LightBackground}
\_\_repr\_\_(self) & repr() \tn 
% Row Count 13 (+ 1)
% Row 9
\SetRowColor{white}
\_\_len\_\_(self) & len() \tn 
% Row Count 14 (+ 1)
% Row 10
\SetRowColor{LightBackground}
\seqsplit{\_\_getitem\_\_(self},n) & subscritable and slice-able \tn 
% Row Count 16 (+ 2)
% Row 11
\SetRowColor{white}
\seqsplit{\_\_setitem\_\_(self},key,value) & supporting item assignment \tn 
% Row Count 19 (+ 3)
% Row 12
\SetRowColor{LightBackground}
\_\_call\_\_(self) & -\textgreater{} callable \tn 
% Row Count 20 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{inheritance}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{overriding \_\_init\_\_: \newline super(child class,self).\_\_init\_\_(*para)} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.73735 cm} x{2.23965 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{datetime}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{from datetime import datetime} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
dt = datetime(2015,4,19,12,20) & 2015-04-19 12:20:00 \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
datetime.now() & current date and time \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
\seqsplit{datetime.strptime('2015-6-1} 18:19:59','\%Y-\%m-\%d \%H:\%M:\%S') & str -\textgreater{} datetime \tn 
% Row Count 8 (+ 3)
% Row 4
\SetRowColor{LightBackground}
dt.strftime('\%a,\%b \%d \%H \%M') & datetime -\textgreater{} str \tn 
% Row Count 10 (+ 2)
% Row 5
\SetRowColor{white}
from datetime import timedelta & datetime addition and subtraction \tn 
% Row Count 12 (+ 2)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{now + timedelta(hours = 10)} \tn 
% Row Count 13 (+ 1)
% Row 7
\SetRowColor{white}
\mymulticolumn{2}{x{5.377cm}}{now + timedelta(days=1)} \tn 
% Row Count 14 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{1.89126 cm} x{3.08574 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{JSON}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{import json} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\seqsplit{js=json.dumps(py)} & convet from python obj to json \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
py = json.loads(js) & convert from json to python obj \tn 
% Row Count 5 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}