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I want to be able to open up an image file and extra the hexadecimal values byte-by-byte. I have no idea how to do this and googling "python byte editing" and "python byte array" didn't come up with anything, surprisingly. Can someone point me towards the library i need to use, specific methods i can google, or tutorials/guides?
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Data can be edited in a hex editor just like a normal text editor. You can edit the file by its Hex value or its ASCII text character. To do this use the mouse to click on a specific position in either column.
Give value of roll number from user using input() function and store it in variable say roll. Open binary file say 'student. dat' in rb+( read and binary mode) and store it in file object say 'file' Use load method to read binary file data and pass file object say 'file' as an argument to load method of pickle module.
Just change s to open(filename). read() and you should be good. Or, if you do not want to keep the whole list in memory at once for large files.
Python standard library has mmap module, which can be used to do exactly this. Take a look on the documentation for further information.
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