(filename: str)
return filename
r"""Pass it a filename and it will return a secure version of it. This
    filename can then safely be stored on a regular file system and passed
    to :func:`os.path.join`.  The filename returned is an ASCII only string
    for maximum portability.
    >>> secure_filename("My cool movie.mov")
    'My cool movie.mov'
    >>> secure_filename("../../../etc/passwd")
    'etc_passwd'
    >>> secure_filename('i contain cool \xfcml\xe4uts.txt')
    'i contain cool umlauts.txt'
    The function might return an empty filename.  It's your responsibility
    to ensure that the filename is unique and that you abort or
    generate a random filename if the function returned an empty one.
r"""Pass it a filename and it will return a secure version of it. This
    filename can then safely be stored on a regular file system and passed
    to :func:`os.path.join`.  The filename returned is an ASCII only string
    for maximum portability.
    >>> secure_filename("My cool movie.mov")
    'My cool movie.mov'
    >>> secure_filename("../../../etc/passwd")
    'etc_passwd'
    >>> secure_filename('i contain cool \xfcml\xe4uts.txt')
    'i contain cool umlauts.txt'
    The function might return an empty filename.  It's your responsibility
    to ensure that the filename is unique and that you abort or
    generate a random filename if the function returned an empty one.
r Pass it a filename and it will return a secure version of it . This filename can then safely be stored on a regular file system and passed to : func : os . path . join . The filename returned is an ASCII only string for maximum portability . >>> secure_filename ( My cool movie . mov ) My cool movie . mov >>> secure_filename ( .. / .. / .. / etc / passwd ) etc_passwd >>> secure_filename ( i contain cool \ xfcml \ xe4uts . txt ) i contain cool umlauts . txt The function might return an empty filename . It s your responsibility to ensure that the filename is unique and that you abort or generate a random filename if the function returned an empty one .
def secure_filename(filename: str) -> str:
    r"""Pass it a filename and it will return a secure version of it. This
    filename can then safely be stored on a regular file system and passed
    to :func:`os.path.join`.  The filename returned is an ASCII only string
    for maximum portability.
    >>> secure_filename("My cool movie.mov")
    'My cool movie.mov'
    >>> secure_filename("../../../etc/passwd")
    'etc_passwd'
    >>> secure_filename('i contain cool \xfcml\xe4uts.txt')
    'i contain cool umlauts.txt'
    The function might return an empty filename.  It's your responsibility
    to ensure that the filename is unique and that you abort or
    generate a random filename if the function returned an empty one.
    """
    _filename_ascii_strip_re = re.compile(r"[^A-Za-z0-9_.-]")
    filename = unicodedata.normalize("NFKD", filename)
    filename = filename.encode("ascii", "ignore").decode("ascii")

    for sep in os.path.sep, os.path.altsep:
        if sep:
            filename = filename.replace(sep, " ")
    filename = str(_filename_ascii_strip_re.sub("", filename)).strip("._")

    return filename
def secure_filename ( filename : str ) -> str : _filename_ascii_strip_re = re . compile ( r"[^A-Za-z0-9_.-]" ) filename = unicodedata . normalize ( "NFKD" , filename ) filename = filename . encode ( "ascii" , "ignore" ) . decode ( "ascii" ) for sep in os . path . sep , os . path . altsep : if sep : filename = filename . replace ( sep , " " ) filename = str ( _filename_ascii_strip_re . sub ( "" , filename ) ) . strip ( "._" ) return filename