Question

CSV has field that is being parsed which may or may not have entries within the field that have values that are additionally separated by comma.

import csv

def import_text(filename, separator):
    for line in csv.reader(open(filename), delimiter=separator,
                           skipinitialspace=True):
        if line[19]:
           for elt in line[19].split(','):
               yield elt


for data in import_text('filename.csv', ','):
    print (data)

Using the script above, column 20 in a CSV will print the following:

a
b, c, d
e, f

I would instead like b, c, d; e, f to print on their own respective lines like so:

a
b
c
d
e
f

Answer 1

Split the column and yield fields individually:

import csv

def import_text(filename, separator):
  for line in csv.reader(open(filename), delimiter=separator, skipinitialspace=True):
    if line[19]:
      for elt in line[19].split(separator):
        yield elt.strip()

for data in import_text('filename.csv', ','):
  print (data)