python :用numpy把数据写进文件

import numpy as np
import os

data = np.arange(100, dtype=np.int)
data.tofile("temp")  # save the data

f = open("temp", "rb")  # reopen the file
f.seek(256, os.SEEK_SET)  # seek

x = np.fromfile(f, dtype=np.int)  # read the data into numpy
print x
# [64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88
# 89 90 91 92 93 94 95 96 97 98 99]