\subsection{Line style/marker}

\begin{lstlisting}

The following format string characters are accepted 

to control the line style or marker:

    ================    ===============================

    character           description

    ================    ===============================

    '-'                 solid line style

    '--'                dashed line style

    '-.'                dash-dot line style

    ':'                 dotted line style

    '.'                 point marker

    ','                 pixel marker

    'o'                 circle marker

    'v'                 triangle_down marker

    '^'                 triangle_up marker

    '<'                 triangle_left marker

    '>'                 triangle_right marker

    '1'                 tri_down marker

    '2'                 tri_up marker

    '3'                 tri_left marker

    '4'                 tri_right marker

    's'                 square marker

    'p'                 pentagon marker

    '*'                 star marker

    'h'                 hexagon1 marker

    'H'                 hexagon2 marker

    '+'                 plus marker

    'x'                 x marker

    'D'                 diamond marker

    'd'                 thin_diamond marker

    '|'                 vline marker

    '_'                 hline marker

    ================    ===============================

\end{lstlisting}

\subsection{Marker combinations}

\typ{In []: plot(x, y, 'ro')} \\

This plots figure with red colored filled circles.\\

Similarly other combination of colors and marker can be used.

\subsection{Appending to lists}

\subsection{Iterating over a List}

In []: for element in b:  # Iterating over the list, element-wise

 ....:     print element       # Print each element

\section{Strings}

\subsection{Splitting Strings}

In []: greet = ``hello world''

In []: print greet.split()

Out[]: ['hello', 'world']

In []: greet = ``hello, world''

In []: print greet.split(',')

Out[]: ['hello', ' world'] # Note the whitespace before 'world'

A string can be split based on the delimiter specified within quotes. A combination of more than one delimiter can also be used.\\

\typ{In []: greet.split(', ')}\\

\typ{Out[]: ['hello', 'world']}\\Note the whitespace is not there anymore.

\section{Plotting from Files}

\subsection{Opening, reading and writing files}

\begin{lstlisting}

  In []: f = open('datafile.txt') #By default opens in read mode. If file does not exist then it throws an exception

  In []: f = open('datafile.txt','r') #Specifying the read mode

  In []: f = open('datafile.txt', 'w') #Opens the file in write mode. If the file already exists, then it deletes all the previous content and opens.

\end{lstlisting}

\subsection{Plotting}

\begin{lstlisting}

l = []

t = []

for line in open('pendulum.txt'):

    point = line.split()

    l.append(float(point[0]))

    t.append(float(point[1]))

tsq = []

for time in t:

    tsq.append(time*time)

plot(l, tsq, '.')