old_contents: # -*- coding: utf-8 -*-
  # TODO: doc
  import pandas as pd  # create_conf_file
  import csv  # write_conf_header, create_conf_file
  import json  # create_conf_file
  
  
  def write_conf_header(metadata_path):
      # TODO: doc
      files = ['emg', 'markers', 'force', 'participants', 'trials']
      headers = {
          'emg': ['muscle_id', 'publication_name'],
          'markers': ['marker_id'],
          'force': ['analog_id'],
          'participants': ['pseudo', 'process', 'laterality', 'group', 'mass', 'height', 'date'],
          'trials': ['folder', 'emg', 'markers', 'force']
      }
      for ifile in files:
          with open('{}{}.csv'.format(metadata_path, ifile), 'w') as out:
              writer = csv.DictWriter(out, fieldnames=headers[ifile])
              writer.writeheader()
  
  
  def create_conf_file(metadata_path):
      # TODO: doc
      files = ['emg', 'markers', 'force', 'participants', 'trials']
      # read each csv files into dict
      d = {name: pd.read_csv('{}{}.csv'.format(metadata_path, name)) for name in files}
  
      # merge dicts into json files
      z = {k: json.loads(d[k].to_json()) for k in d}
  
      # export json file
      outpath = '{}config.json'.format(metadata_path)
      with open(outpath, 'w') as out:
          out.write(json.dumps(z, indent=4))
  
new_contents: # -*- coding: utf-8 -*-
  # TODO: doc
  import pandas as pd  # create_conf_file
  import csv  # write_conf_header, create_conf_file
  import json  # create_conf_file
  
  
  def write_conf_header(metadata_path):
      # TODO: doc
      files = ['emg', 'markers', 'force', 'participants', 'trials']
      headers = {
          'emg': ['muscle_id', 'publication_name'],
          'markers': ['marker_id'],
          'force': ['analog_id'],
          'participants': ['pseudo', 'process', 'laterality', 'group', 'mass', 'height', 'date'],
          'trials': ['folder', 'emg', 'markers', 'force']
      }
      for ifile in files:
          with open('{}{}.csv'.format(metadata_path, ifile), 'w') as out:
              writer = csv.DictWriter(out, fieldnames=headers[ifile])
              writer.writeheader()
  
  
  def create_conf_file(metadata_path):
      # TODO: doc
      files = ['emg', 'markers', 'force', 'participants', 'trials']
      # read each csv files into dict
      csv_dict = {ifile: pd.read_csv('{}{}.csv'.format(metadata_path, ifile)) for ifile in files}
  
      # merge dicts into json files
      json_file = {key: json.loads(csv_dict[key].to_json()) for key in csv_dict}
  
      # export json file
      json_path = '{}config.json'.format(metadata_path)
      with open(json_path, 'w') as json_data:
          json_data.write(json.dumps(json_file, indent=4))
  
  
  def load_conf_file(metadata_path):
      # TODO: doc
      json_path = '{}config.json'.format(metadata_path)
      with open(json_path, 'r') as json_data:
          return json.load(json_data)
  
subject: rename some variable