Question

I’m having problems with the writerow() function. I have an object (orders_matrix) like this:

[[datetime.datetime(2008, 11, 20, 16, 0), 'AA', 'Buy', '100'],     
[datetime.datetime(2008, 11, 28, 16, 0), 'AA', 'Sell', '100'],
[datetime.datetime(2009, 2, 17, 16, 0), 'AA', 'Buy', '100']]

and would like to write it in CSV format like this:

2008,11,20,AA,Buy,100,
2008,11,28,AA,Sell,100,
2009,2,17,AA,Buy,100,

I’ve tried to use the writerow() function in a for loop:

with open('orders.csv', 'w') as orders_file:
  writer = csv.writer(orders_file)
  for row in orders_matrix:
    writer.writerow([row[:4], row[5:7], row[8:10], row[11:]])

but couldn’t be able to convert the datetime object and add the other elements. I’d like to know if it’s possible to do that and how.

Answer 1

You can use the year, month, day properties of the datetime object to get the related values. So, the last line might be changed with:

writer.writerow([row[0].year, row[0].month, row[0].day, row[1], row[2], row[3]])