DL Zip



In [1]:

    
import urllib2, zipfile



In [7]:

    
url = 'http://ipython.rossant.net/'
filename = 'facebook.zip'



In [8]:

    
downloaded = urllib2.urlopen(url + filename)



In [9]:

    
folder = 'data'



In [10]:

    
mkdir $folder



In [11]:

    
cd $folder









    



/Users/sukruhasdemir/Dropbox/python-study/ipython-book/data/data



In [12]:

    
cd ..









    



/Users/sukruhasdemir/Dropbox/python-study/ipython-book/data



In [13]:

    
with open(filename, 'wb') as f:
    f.write(downloaded.read())



In [14]:

    
with zipfile.ZipFile(filename) as zip:
    zip.extractall('.')



In [15]:

    
cd $folder









    



[Errno 2] No such file or directory: 'data'
/Users/sukruhasdemir/Dropbox/python-study/ipython-book/data



In [18]:

    
ls









    



facebook/       facebook-r.zip  facebook.zip



In [19]:

    
cd facebook/









    



/Users/sukruhasdemir/Dropbox/python-study/ipython-book/data/facebook



In [20]:

    
ls









    



0.circles     1684.circles  3437.circles  3980.circles  686.circles
0.edges       1684.edges    3437.edges    3980.edges    686.edges
107.circles   1912.circles  348.circles   414.circles   698.circles
107.edges     1912.edges    348.edges     414.edges     698.edges



In [21]:

    
%bookmark fbdata



In [23]:

    
pwd









    Out[23]:





u'/Users/sukruhasdemir/Dropbox/python-study/ipython-book/data/facebook'



In [24]:

    
cd ..









    



/Users/sukruhasdemir/Dropbox/python-study/ipython-book/data



In [25]:

    
cd facebook/









    



/Users/sukruhasdemir/Dropbox/python-study/ipython-book/data/facebook



In [26]:

    
with open('0.edges', 'r') as f:
    print f.readline()

System shell:



In [32]:

    
cd fbdata









    



(bookmark:fbdata) -> /Users/sukruhasdemir/Dropbox/python-study/ipython-book/data/facebook
/Users/sukruhasdemir/Dropbox/python-study/ipython-book/data/facebook



In [39]:

    
files = !ls -1 -S | grep edges



In [40]:

    
files









    Out[40]:





['1912.edges',
 '107.edges',
 '1684.edges',
 '3437.edges',
 '348.edges',
 '0.edges',
 '414.edges',
 '686.edges',
 '698.edges',
 '3980.edges']



In [41]:

    
!head -n5 {files[0]}



In [54]:

    
%alias largest ls -1shS | grep %s



In [55]:

    
largest circles









    



  16 1912.circles
   8 1684.circles
   8 107.circles
   8 348.circles
   8 686.circles
   8 0.circles
   8 3437.circles
   8 414.circles
   8 698.circles
   8 3980.circles



In [56]:

    
%store largest









    



Alias stored: largest (ls -1shS | grep %s)

History:



In [57]:

    
2 + 3









    Out[57]:





5



In [58]:

    
_ * 2









    Out[58]:





10



In [59]:

    
%hist -nop 1-2









    



   1: >>> ls
   2: >>> pwd
u'/Users/sukruhasdemir/Dropbox/python-study/ipython-book'



In [62]:

    
cd ..









    



/Users/sukruhasdemir/Dropbox/python-study/ipython-book/data



In [63]:

    
%run egos.py facebook



In [64]:

    
ids









    Out[64]:





[0, 107, 348, 414, 686, 698, 1684, 1912, 3437, 3980]



In [65]:

    
run egos.py









    



---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
/Users/sukruhasdemir/anaconda/lib/python2.7/site-packages/IPython/utils/py3compat.pyc in execfile(fname, *where)
    176             else:
    177                 filename = fname
--> 178             __builtin__.execfile(filename, *where)

/Users/sukruhasdemir/Dropbox/python-study/ipython-book/data/egos.py in <module>()
      4         folder = sys.argv[1]
      5 
----> 6 files = os.listdir(folder)
      7 
      8 ids = sorted(set(map(lambda file: int(file.split('.')[0]), files)))

NameError: name 'folder' is not defined



In [69]:

    
run -i egos.py



In [70]:

    
ids









    Out[70]:





[0, 107, 348, 414, 686, 698, 1684, 1912, 3437, 3980]

NetworkX



In [2]:

    
import networkx as nx



In [9]:

    
g = nx.read_edgelist('0.edges')



In [10]:

    
len(g.nodes()), len(g.edges())









    Out[10]:





(333, 2519)



In [77]:

    
nx.radius(g)









    



---------------------------------------------------------------------------
NetworkXError                             Traceback (most recent call last)
<ipython-input-77-73e1ad16c3de> in <module>()
----> 1 nx.radius(g)

/Users/sukruhasdemir/anaconda/lib/python2.7/site-packages/networkx/algorithms/distance_measures.pyc in radius(G, e)
    140     """
    141     if e is None:
--> 142         e=eccentricity(G)
    143     return min(e.values())
    144 

/Users/sukruhasdemir/anaconda/lib/python2.7/site-packages/networkx/algorithms/distance_measures.pyc in eccentricity(G, v, sp)
     60         if L != order:
     61             msg = "Graph not connected: infinite path length"
---> 62             raise networkx.NetworkXError(msg)
     63 
     64         e[v]=max(length.values())

NetworkXError: Graph not connected: infinite path length



In [11]:

    
sg = nx.connected_component_subgraphs(g)



In [12]:

    
[len(s) for s in sg]









    Out[12]:





[324, 3, 2, 2, 2]



In [13]:

    
sgfirst = sg[0]



In [14]:

    
nx.radius(sgfirst), nx.diameter(sgfirst)









    Out[14]:





(6, 11)



In [85]:

    
class MyClass(object):
    def __dir__(self):
        return ['attr1', 'attr2']



In [86]:

    
obj = MyClass()



In [ ]:

    
obj.



In [89]:

    
??nx



In [94]:

    
%pfile egos.py









    



Object `egos.py` not found.



In [96]:

    
%timeit nx.center(sgfirst)









    



1 loops, best of 3: 209 ms per loop



In [97]:

    
nx.center(sgfirst)









    Out[97]:





[u'51', u'190', u'83', u'307', u'175', u'237', u'277', u'124']

Profiling a script:



In [104]:

    
%run -t center.py









    



[u'51', u'190', u'83', u'307', u'175', u'237', u'277', u'124']

IPython CPU timings (estimated):
  User   :      64.32 s.
  System :       1.10 s.
Wall time:      64.67 s.



In [105]:

    
%run -p center.py









    



[u'51', u'190', u'83', u'307', u'175', u'237', u'277', u'124']



In [15]:

    
run -t center2.py









    



[u'51', u'190', u'83', u'307', u'175', u'237', u'277', u'124']

IPython CPU timings (estimated):
  User   :       0.46 s.
  System :       0.01 s.
Wall time:       0.46 s.



In [108]:

    
%%file text.txt
Hello world!









    



Overwriting text.txt



In [110]:

    
%%!
more text.txt









    Out[110]:





['Hello world!']



In [122]:

    
code = """
import networkx as nx

g = nx.read_edgelist('0.edges')
sg = nx.connected_component_subgraphs(g)[0]

ecc = nx.eccentricity(sg)
r = nx.radius(sg)

center = [node for node in sg.nodes() if ecc[node] == r]

print center
"""
f = open('code2.py', 'w')
f.write(code)
f.close()



In [123]:

    
run code2.py









    



[u'51', u'190', u'83', u'307', u'175', u'237', u'277', u'124']

Hello World Example

In this example we'll learn how to:

Convert a cell in Markdown
Dispaly formatted text with Markdown



In [17]:

    
nx.draw_networkx(sgfirst, node_size=15, edge_color='b', with_labels=False, alpha=.4, linewidths=0)



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