import string

def format_filename(s):
	## from https://g...content-available-to-author-only...b.com/seanh/93666
    """Take a string and return a valid filename constructed from the string.
    Uses a whitelist approach: any characters not present in valid_chars are
    removed. Also spaces are replaced with underscores.
    
    Note: this method may produce invalid filenames such as ``, `.` or `..`
    When I use this method I prepend a date string like '2009_01_15_19_46_32_'
    and append a file extension like '.txt', so I avoid the potential of using
    an invalid filename.
    
    """
    valid_chars = "-_.() %s%s" % (string.ascii_letters, string.digits)
    filename = ''.join(c for c in s if c in valid_chars)
    filename = filename.replace(' ','_') # I don't like spaces in filenames.
    return filename


astr='\gbahsd:njs?<>|"asd/as*'
res = format_filename(astr)
print(res)