# Understanding Code

subhabangalore at gmail.com subhabangalore at gmail.com
Tue Nov 13 10:05:37 CET 2012

```Dear Group,
To improve my code writing I am trying to read good codes. Now, I have received a code,as given below,(apology for slight indentation errors) the code is running well.
Now to comprehend the code, I am looking to understand it completely.

class Calculate:
def __init__(self):
self.prior = {}
self.total = {}
self.count = 0
self.prior[cls] = self.prior.get(cls, 0) + 1
for idx, val in enumerate(obs):
key = cls, idx, val
self.total[key] = self.total.get(key, 0) + 1
self.count += 1
def discr(self, cls, obs):
result = self.prior[cls]/self.count
for idx, val in enumerate(obs):
freq = self.total.get((cls, idx, val), 0)
result *= freq/self.prior[cls]
return result
def classify(self, obs):
candidates = [(self.discr(c, obs), c) for c in self.prior]
return max(candidates)[1]

I am not understanding many parts of it, I am understanding many parts of it also.

So I am looking for an exercise what are the things I should know to understand it, (please do not give answers I would get back with the answers in a week and would discuss even how to write better than this).

If any one of the expert members of the room kindly help me to do this.