Python profiling

Profiling in python is very handy. It will help you to monitor your code performance and find the hot spot of your code.
Here I am using cProfile for profiling. It is built in with python.

Download sample code , unzip the file and cd to the folder.
No run this command python -m cProfile a.py
Output will be

Visualization of cProfile data:

I used RunSnakeRun for visualization.
Now run this following two command (make sure you installed RunSnakeRun)
python -m cProfile -o file.prof a.py
runsnake file.prof
Output will be

Check it out.

Min, max value and index from list

See also enumerate and operator.itemgetter

import operator
a = [2, 5, 1, 4, 8, 71, 4, 1, 21]
min_i, min_v = min(enumerate(a), key = operator.itemgetter(1))
max_i, max_v = max(enumerate(a), key = operator.itemgetter(1))

print "[Min] index:",min_i,"value:",min_v
print "[Max] index:",max_i,"value:",max_v

Output:

[Min] index: 2 value: 1
[Max] index: 5 value: 71

Python: Absolute difference between successive elements in list

See also abs, zip and islice

from itertools import islice

a = [1, 4 , 2 , 6 , 7, 3]
result = [abs(p-q) for p, q in zip(a, islice(a, 1, None))]

print result

Output:

[3, 2, 4, 1, 4]