from IPython.core.display import Image
Image(url='http://labrosa.ee.columbia.edu/crucialpython/logo.png', width=600)

import numpy as np
X = 1
Y = 'c'
Z = X+Y
A = 3
B = 4

whos

locals()

%connect_info

%qtconsole

%debug

def square_sum(a,b):
    c=a*a
    d=b*b
    return c+d

import ipdb as pdb
X = 1
pdb.set_trace()
Y = 1
Z= square_sum(X,Y)
for i in xrange(20):
    X=X+ square_sum(X,Y)/(X*X)
    print X
    pdb.set_trace()

%run -d sample_debug.py : run debuger inside ipython

%pdb

X = 1
Y = 'c'
Z = X+Y
A = 1