make_csv.py

#!/usr/bin/env python
# vim: fileencoding=utf-8
from __future__ import division, absolute_import, print_function, unicode_literals
import os.path
import unicode_csv
import io

writer = unicode_csv.writer(io.open(os.path.expanduser("~/large.csv"), 'w', encoding='cp932'))
row = [unicode(i) for i in range(200)]
for i in range(100000):
    writer.writerow(row)

read_csv.py

# vim: fileencoding=utf-8
from __future__ import division, absolute_import, print_function, unicode_literals

import csv
import datetime
import io
import os.path
import unicode_csv

CSV_PATH = os.path.expanduser("~/large.csv")
NUM = 10

def calc(reader_f):
    s = 0.0
    for i in range(NUM):
        start = datetime.datetime.now()
        for row in reader_f():
            pass
        end = datetime.datetime.now()
        d = end - start
        s += d.seconds*1000000 + d.microseconds
    return s/NUM

def csv_reader():
    return csv.reader(open(CSV_PATH, 'rb'))

def unicode_csv_reader():
    return unicode_csv.reader(io.open(CSV_PATH, 'r', encoding='cp932'))

readers = {
    'csv': csv_reader,
    'unicode_csv': unicode_csv_reader,
    }

for key, reader in readers.iteritems():
    t = calc(reader)
    print("{}:\t{}msec".format(key, t))

# csv:	1977300.0msec
# unicode_csv:	2374700.0msec