How two merge several .csv files horizontally with python?

Question

I\'ve several .csv files (~10) and need to merge them together into a single file horizontally. Each file has the same number of rows (~300) and 4 header lines which are not

Answer 1

You can load the CSV files using the csv module in Python. Please refer to the documentation of this module for the loading code, I cannot remember it but it is really easy. Something like:

import csv
reader = csv.reader(open("some.csv", "rb"))
csvContent = list(reader)

After that, when you have the CSV files loaded in such form (a list of tuples):

[ ("header1", "header2", "header3", "header4"),
  ("value01", "value12", "value13", "value14"),
  ("value11", "value12", "value13", "value14"),
  ... 
]

You can merge two such lists line-by-line:

result = [a+b for (a,b) in zip(csvList1, csvList2)]

To save such a result, you can use:

writer = csv.writer(open("some.csv", "wb"))
writer.writerows(result)