Guess the MIME types of the files in the file directory.

file_mime_typer.py

#!/usr/bin/env python3
import mimetypes
from pathlib import Path

CWD = Path('.')


def file_mime_typer(fp):
    """Guess the MIME type of file.

    Returns (dict):
        MIME type, filename, and binary content of the file.
    References:
        https://docs.python.org/3/library/email.examples.html#id2
    """
    # MIME type
    ctype, encoding = mimetypes.guess_type(fp)
    if (ctype is None) or (encoding is not None):
        ctype = 'application/octet-stream'  # Miscellaneous types
    maintype, subtype = ctype.split('/', maxsplit=1)
    # Binary content
    with open(fp, 'rb') as f:
        bin_content = f.read()
    return dict(maintype=maintype, subtype=subtype, filename=fp.name, bin_data=bin_content)


def dir_mime_typer(file_dir):
    """Guess the MIME types of the files in the file directory.

    Args:
        file_dir (path_-like):
          path-like to the directory containing the target files.
    Yields:
        MIME types, filenames, and sizes of the files.
    """
    for path_ in Path(file_dir).glob('*'):
        if not path_.is_file():
            continue
        yield file_mime_typer(path_)


if __name__ == '__main__':
    mime_type_dicts = dir_mime_typer(input('File DIR? >> '))
    print()
    for d in mime_type_dicts:
        fname = d.get('filename')
        mtype = d.get('maintype')
        stype = d.get('subtype')
        data_ = d.get('bin_data')
        print(f'''\
filename: {fname}
  maintype: {mtype}
  subtype : {stype}
  filesize: {len(data_)}
'''
              )