Question

I’m currently opening CSV files in Excel with multiple columns, where values will only appear if a number changes. For example, the data may ACTUALLY be: 90,90,90,90,91. But it will only appear as 90,,,,91. I’d really like the values in between to be filled with 90s. Is there anyway python could help with this? I really appreciate your help!

Answer 1

a short solution (one liner for transforming ['90','','','','','91'] into ['90','90','90','90','90','91']):

 import csv
 spamReader = csv.reader(open('eggs.csv', 'rb'))
 for row in spamReader:
      a = map(lambda i : reduce(lambda y, z: z != "" and z or y, row[:i]), range(1,len(row)+1))
      print ",".join(a)