Grouping on and exporting to csv files

accessnewbie at gmail.com accessnewbie at gmail.com
Wed Mar 20 01:34:26 CET 2013


My current Test_Sort.csv looks like this (which constantly changes-although never more than 4 records, thus far anyway):

RecNo,Count,District,Fruit,StoreNo
1,100,0,oranges,1254
2,30,3,apples,654
3,100,0,bananas,21
4,0,4,grapes,478

I wrote the following python 2.7 script (stuck with 2.7)

---------------------
import sys
import csv
import operator


source = "E:\\Data\\Test_Sort.csv"
result = "E:\\Data\\Test_Sort1.csv"

with open(source,"rb") as source:
    rdr= csv.reader( source )
    with open(result,"wb") as result:
        next(rdr, None) # Skip header
        wtr= csv.writer( result )
        for r in rdr:
            wtr.writerow( (r[2], r[3])) # Only write columns 3 and 4 to a csv file
    exit
exit

data = csv.reader(open("E:\\Data\\Test_Sort1.csv"),delimiter=',')
sortedlist = sorted(data, key=operator.itemgetter(0,1)) # sort by column 1, the 2
print sortedlist

-----------------------------

My sortedlist results are:

[['0', 'bananas'], ['0', 'oranges'], ['3', 'apples'], ['4', 'grapes']]

I want to output all fruits with the same District number out to a csv file called by its District number. (No headers)

Thus in above example I would ultimately have three csv files:

0.csv
bananas
oranges

3.csv
apples

4.csv
grapes

Question is : Any ideas as to how export this sortedlist to the tables described above?

I already have a script that already will look at each file and count the number of lines and insert the correct number of commas and the word "and" where appropriate in a sentence.

My ultimate goal is to read each file and print out a sentence based on whether it has record or not, and if so how many records and then add the word "and" and/or commas between records if greater than 1. I will then concatenate all the sentences together to form a paragraph.

Thus, the above example would say: 

The western district sold bananas and oranges. The central district sold apples. The southern district sold grapes.

or if the files were:

0.csv
apples
bananas
oranges

2.csv
grapes

The resulting paragraph would read:

The western district sold apples, bananas, and oranges. The eastern district sold grapes.

It may seem like a crazy way about getting my results but it was the best I could come up with given my limited knowledge of python.

Thanks for any and all help.




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