code: def get_currency(currency_str):
      
      path = 'units/currencies.csv'  # always use slash in Python packages
      filepath = pkg_resources.resource_filename('mpu', path)
      with open(filepath, 'r') as fp:
          reader = csv.reader(fp, delimiter=',', quotechar='"')
          next(reader, None)  # skip the headers
          for row in reader:
              is_currency = currency_str in [row[0], row[1], row[2]]
              if is_currency:
                  entity = row[0]
                  name = row[1]
                  code = row[2]
                  numeric_code = row[3]
                  symbol = row[4]
                  if len(row[5]) == 0:
                      exponent = None
                  else:
                      exponent = int(row[5])
                  if len(row[6]) > 0:
                      withdrawal_date = row[6]
                  else:
                      withdrawal_date = None
                  subunits = row[7]
                  return Currency(name=name,
                                  code=code,
                                  numeric_code=numeric_code,
                                  symbol=symbol,
                                  exponent=exponent,
                                  entities=[entity],
                                  withdrawal_date=withdrawal_date,
                                  subunits=subunits)
      raise ValueError('Could not find currency \'{}\''.format(currency_str))
docs: Convert an identifier for a currency into a currency object.
  
      Parameters
      ----------
      currency_str : str
  
      Returns
      -------
      currency : Currency