someone to help here

import csv

def open_with_csv(filename, d='\t'):
  data = []
  with open(filename, encoding='utf-8') as tsvin:
    tie_reader = csv.reader(tsvin, delimiter=d)
    for row in tie_reader:
      data.append(row)
  return data

def filter_col_by_string(the_data, field, filter_condition):
    filtered_rows = []

    #find index of field in first row
    col = int(the_data[0].index(field))
    filtered_rows.append(the_data[0])

    for row in the_data[1:]:
        if row[col] == filter_condition:
            filtered_rows.append([str(x).encode('utf8') for x in row])

    return filtered_rows

data_from_csv = open_with_csv('data.csv')

# YOUR CODE HERE
def filter_col_by_string(data_sample, field, filter_condition):
    filtered_rows = []

    col = int(data_sample[0].index(field))
    filtered_rows.append(data_sample[0])

    for item in data_sample[1:]:
        if item[col] == filter_condition:
            filtered_rows.append(item)

    return filtered_rows

silk_ties = filter_col_by_string(data_from_csv, "material", "_silk")
print("Found {} silk ties".format(number_of_records(silk_ties)))

wool_ties = filter_col_by_string(data_from_csv, "material", "_wool")
print("Found {} wool ties".format(number_of_records(wool_ties)))

cotton_ties = filter_col_by_string(data_from_csv, "material", "_cotton")
print("Found {} cotton ties".format(number_of_records(cotton_ties)))