\documentclass[12pt]{article}

\title{Interactive Plotting}

\author{FOSSEE}

\usepackage{listings}

\lstset{language=Python,

    basicstyle=\ttfamily,

  commentstyle=\itshape\bfseries,

  showstringspaces=false,

}

\newcommand{\typ}[1]{\lstinline{#1}}

\usepackage[english]{babel}

\usepackage[latin1]{inputenc}

\usepackage{times}

\usepackage[T1]{fontenc}

\usepackage{ae,aecompl}

\usepackage{mathpazo,courier,euler}

\usepackage[scaled=.95]{helvet}

\begin{document}

\date{}

\vspace{-1in}

\begin{center}

\LARGE{Statistics and Least square fit}\\

\large{FOSSEE}

\end{center}

\section{Statistics}

Dictionary

\begin{lstlisting}

In []: d = {"Hitchhiker's guide" : 42, 

 ....:      "Terminator" : "I'll be back"} #Creation

In []: d["Hitchhiker's guide"] # Accessing a value with key

In []: "Hitchhiker's guide" in d #Checking for a key

In []: d.keys() # Obtaining List of Keys

In []: d.values() # Obtaining List of Values

\end{lstlisting}

Iterating through List indices

\begin{lstlisting}

In []: names = ["Guido","Alex", "Tim"]

In []: for i, name in enumerate(names):

  ...:     print i, name

\end{lstlisting}

Computing Mean value of `\texttt{g}'

\begin{lstlisting}

In []: G = []

In []: for line in open('pendulum.txt'):

  ....     points = line.split()

  ....     l = float(points[0])

  ....     t = float(points[1])

  ....     g = 4 * pi * pi * l / t * t

  ....     G.append(g)

\end{lstlisting}

sum() and len() functions

\begin{lstlisting}

  total = 0

  for g in G:

    total += g

  mean_g = total / len(g)

  mean_g = sum(G) / len(G)

  mean_g = mean(G)

\end{lstlisting}

\newpage

Ternary Operator

\begin{lstlisting}

In []: score = int(score_str) if score_str != 'AA' else 0

\end{lstlisting}

Drawing Pie Charts

\begin{lstlisting}

In []: pie(science.values(), labels=science.keys())

\end{lstlisting}

Arrays

\begin{lstlisting}

In []: a = array([1, 2, 3]) #Creating

In []: b = array([4, 5, 6])

In []: a + b #Sum; Element-wise

\end{lstlisting}

Numpy statistical operations 

\begin{lstlisting}

In []: mean(math_scores) 

In []: median(math_scores)

In []: std(math_scores)

\end{lstlisting}

\end{document}