reading and writing tabular text files in python3

Question

I have several tabular text files in a folder.The data in the first column are strings,second and third column integers.How can I read them all in and write the first column and the second column edited(say divided by two) into a new tabular text file? I've just begun learning python so please kindly give example code if possible.Thanks.

Answer 1

This snippet might give you some idea

# terrible code for educational purposes only!

in_stream = open(filename_in)
out_stream = open(filename_out, 'w')
output = csv.writer(out_stream)

for col_string, col_value1, col_value2 in csv.reader(in_stream):
    new_row = [col_string, col_value1 / 2, col_value2]
    output.write(new_row)