我将如何从 c 到 python 写这个？

Question

I need to convert this to python for my use, I have a file that I want to check for this sequence and I have this code below. Im thinking it will be something like this but unsure how exactly

pkgrep.py

with open('wallet.dat') as reader:
     my_data = reader.read()
     while ((c = getchar()) != EOF)
        if (c == 0x81 && getchar() == 0xd3 && getchar() == 0x02 && getchar() == 0x01 &&
        getchar() == 0x01 && getchar() == 0x04 && getchar() == 0x20)){
           for(i = 0; i < 32; i ++):
               printf("%02x", getchar());
           printf("\n");
     }

pkgrep.c

#include <stdio.h>

main() {
  int c, i;

  while ((c = getchar()) != EOF)
    if (c == 0x81 &&
        getchar() == 0xd3 && getchar() == 0x02 && getchar() == 0x01 &&
        getchar() == 0x01 && getchar() == 0x04 && getchar() == 0x20) {
      for (i = 0; i < 32; i++)
        printf("%02x", getchar());
      printf("\n");
    }

}

Answer 1

You can search for the string in my_data , then get the next 32 bytes with a slice.

Open the file in binary mode to ensure there's no character decoding, and search for the byte string.

with open('wallet.dat', 'rb') as reader:
    my_data = reader.read()
pos = my_data.find(b"\x81\xd3\x02\x01\x01\x04\x20")
if (pos != -1) {
    for x in my_data[pos+7:pos+39]:
        print(f"{x:02x}", end="")
    print()