Returning a dictionary from a file - file

Question

I have have written this code defining a class
class OrderRecord:
"""Defines an OrderRecord class, suitable for use in keeping track of order records"""
import tools2
def __init__(self, string):
"""Creates a new OrderRecord object"""
string = string.split(',')
self.date = string[0]
self.location = string[1]
self.name = string[2]
self.colour = string[3]
self.order_num = string[4]
self.cost = 0
def cost_of_order(self):
"""Creates a list of the name and adds up the cost of each letter"""
letter = list(self.name)
for let in letter:
self.cost = self.cost + self.tools2.letter_price(let, self.colour)
return self.cost
def __str__(self):
"""Calls the cost_of_order function and returns the split string in the required format"""
self.cost = self.cost_of_order()
return("Date: {0}\nLocation: {1}\nName: {2}\nColour: \
{3}\nOrder Num: {4}\nCost: {5:.2f}".format(self.date, self.location, \
self.name, self.colour, self.order_num, self.cost))
Now I need to write a function that reads a file containing the following:
20130902,Te Rakipaewhenua,Vinas,parauri,8638
20130909,Te Papaioea,McClary,kikorangi,11643
20131215,Kapiti,Labrie,kikorangi,65291
20141106,Waihopai,Labrie,ma,57910
and returns a dictionary that has the location as the key and lists of OrderRecords as the values.
I know this isn't too hard of a task but I have been stuck on this for awhile because I can't get my head around what to do for it.
Any help would be appreciated.

Answer 1

Maybe something like this. It is not the solution but it has what you need with some modifications.
import collections
dct_result = collections.defaultdict(list)
for line in open('file_path'):
fields = line.split(',')
# index 1 being the second column
dct_result[field(1)].append(OrderRecord( some args ))