Monday, August 31, 2015

Python, DictReader, DictWriter

Because I can never, ever, remember exactly how to code these. Example of both, basic.

data_list = []

with open(input_file, 'rU') as f:
  data_file = csv.DictReader(f)
  for line in data_file:
    data_list.append(line) # gets you a list of dicts

the_header = ['h1', 'h2', 'etc'] # column headers, a list of text strings

with open(output_file, 'w') as f:
  file_writer = csv.DictWriter(f, fieldnames=the_header)
  for line in data_list:
Here I am going to experiment linking it as a script-tagged element from Gist via GitHub: