Python写入二进制文件 python 二进制写入

python对二进制文件的操作需要使用bytes类，直接写入整数是不行的，如果试图使用f.write(123)向文件中以二进制写入123，结果提示参数不是bytes类型。

 

import os
import struct

a = 0x1A2B3C4D
b = 0x239875ad3d5ffaaa

filepath = 'D:\\wygDocument\\python\\code\\abc.dat'
f_in = open(filepath,'wb+')

for value in range(1,5):
  f_in.write(struct.pack('>I',a))
  f_in.write(struct.pack('>Q',b))
  
f_in.close()
print('Write OK')

 

1 import os
 2 import struct
 3 
 4 #Read file into list
 5 with open('E:/fep/tj19.txt','r') as f:
 6   line = f.read().strip()
 7   linestr = line.split('\n')  #splited by line breaks
 8   #linestr = line.split(r"[\s\n]",line)  #splited by Space character and line breaks
 9 
10 f_out = open('E:/fep/realData.dat','xb')
11 
12 frame_flag_0 = 0x1A2B3C4D5E6F
13 mask = 0xFFFFFFFFFFFF
14 
15 for i in range(0,len(linestr)):
16   filepath = 'E:/fep/19/' + linestr[i]
17   f_in = open(filepath,'rb')
18   f_size = os.path.getsize(filepath)
19   f_in.seek(109)
20 
21   offset = 109
22   chunk = 905
23   
24   while True:
25     if offset >= f_size:
26       break
27     buff = f_in.read(15)
28     offset += chunk
29 
30     unpacked_data = struct.unpack_from('>ih',buff,9)  #start from the 9th byte
31     if(unpacked_data[0] != 439041101) or (unpacked_data[1] != 24175)  #1A2B3C4D     5E6F
32       f_out.write(buff)
33       f_out.write(f_in.read(890))  # 9 + 6 + 890
34 
35     f_in.seek(offset)
36 
37   f_in.close()
38   f_out.flush()
39 
40 f_out.close()
41 print('OK')