python 读写二进制文件实例

#coding:utf--8
#https://www.cnblogs.com/cmnz/p/6986979.html
#https://blog.csdn.net/uuihoo/article/details/79848726
import struct
import numpy as np
a = np.arange(3*4, dtype=np.int32).reshape((3,4))
print(a)
with open(‘sample_struct.dat‘,‘wb‘) as f:
    for row in range(3):
        for col in range(4):
            sn=struct.pack(‘i‘,a[row][col]) #序列化,i表示整数，f表示实数,?表示逻辑值
            f.write(sn)

b = np.zeros((3,4), dtype=np.int32)
with open(‘sample_struct.dat‘,‘rb‘) as f:
    for row in range(3):
        for col in range(4):
            sn=f.read(4)
            b[row][col],=struct.unpack(‘i‘,sn)  #使用指定格式反序列化

print(b)