def foo():
    """docstring"""
    return 'hi'
foo()

def bar():
    print 'hi'

from __future__ import print_function

import time

for i in range(10):
    time.sleep(0.25)
    print(i, end=' ')


import numpy as np

import ctypes
libc = ctypes.CDLL('libc.dylib')
libc.time(-1)

print("I'm okay!")

import numpy as np

np.

np.linspace?

!date

ls

files = !ls

for f in files:
    print(repr(f))

biglist = range(1000000)
bigset = set(biglist)

item = biglist[0]
%timeit item in biglist
%timeit item in bigset

def inner(x):
    return 1/x

def outer(y):
    return inner(1-y)

z = 2
outer(-z + 3)

%debug

%lsmagic

%matplotlib inline
import numpy as np
import matplotlib.pyplot as plt
from scipy.special import jn

x = np.linspace(0,10)
for n in range(5):
    plt.plot(x, jn(n,x))

%%latex
\begin{eqnarray}
\nabla \times \vec{\mathbf{B}} &
    - \frac{1}{c} \frac{\partial\vec{\mathbf{E}}}{\partial t} 
    & = & \frac{4 \pi}{c} \vec{\mathbf{j}} \\
\nabla \cdot \vec{\mathbf{E}} && = & 4 \pi \rho \\
\nabla \times \vec{\mathbf{E}} &
    + \frac{1}{c} \frac{\partial\vec{\mathbf{B}}}{\partial t}
    & = & \vec{\mathbf{0}} \\
\nabla \cdot \vec{\mathbf{B}} && = & 0 
\end{eqnarray}


import sympy
sympy.init_printing(use_latex='mathjax')
x = sympy.symbols('x')
expr = x**10-1
expr

sympy.factor(expr)

from IPython.display import display
from IPython.html.widgets import interact

@interact
def factorit(n=10):
    display(sympy.factor(x**n-1))
    

from IPython.display import Image, YouTubeVideo
Image("figs/darts.png")

YouTubeVideo('BROWqjuTM0g ')

name = "Background"
!head -n 100 {name}.ipynb | pygmentize -l json

!ipython nbconvert {name}.ipynb --to html

from IPython.display import display, HTML
display(HTML("<a href='{name}.html' target='_blank'>{name}.html</a>".format(name=name)))

%%javascript
IPython.notebook.kernel.execute("a=1");

print(a)