[Tutor] File extension against File content

[Cameron Simpson]

On 31May2019 12:38, ingo <ingo at ingoogni.nl> wrote:
>Many file formats have "magic bytes" that you can use for that purpose.
>https://en.wikipedia.org/wiki/List_of_file_signatures

Also, UNIX systems ship with a command called "file" which inspects a 
file's leading data for such magic numbers to identify their content.  
And there's a library called libmagic [1,2] which does this work, and 
there's a PyPI package called python-magic [3] for using this from 
Python, not to mention various other PyPI modules [4].

1: https://sourceforge.net/projects/libmagic/
2: https://github.com/threatstack/libmagic
3: https://pypi.org/project/python-magic/
4: https://pypi.org/search/?q=magic

Cheers,
Cameron Simpson <cs at cskk.id.au>