add the code to improve
Question 1
Question 2
Typos
question 2
Check ratio boundaries consistence at the beginning
Now one may replay, change input to raw_input
init correct with 0.0 avoids casting while computing ratio
pep8
up to question 5
remove pdb call
Expert quiestion 1
expert question 2
cosmit
Adds another file
Merge https://github.com/cgoutte/playground