测试TF card 的读写速度

TF card的读写速度

# _*_ coding: utf_8 _*_import timeimport datetimedef test_card_r():    fin = open('test1.txt')    for line in fin:        word = line.strip()    return worddef test_card_w(num):    test1 = open('test1.txt', 'w')    while True:        line = "Holle world"        test1.write(line)        length = test1.tell()        if length >= (1024 ** 2 * num):            print length            break    return test1def datetime_now():    now = int(time.time())    print('now:' , now)    return nowdef card_time(num):    w_start_time = datetime_now()    test_card_w(num)    r_start_time = datetime_now()    test_card_r()    time = datetime_now()    w_time = r_start_time - w_start_time    print('w_time:', w_time)    wv = num / float(w_time)    print('wv:' , wv)    r_time = time - r_start_time    print r_time    f_time = time - w_start_time    print f_time    return f_timecard_time(50)