bad_chars = {u"n": u" ", u"b": u" ", u"f": u" ", u"r": u" ", u"t": u" ", u"v": u" ", u"x00": u" "}
bad_chars_table = dict((ord(k), v) for k, v in bad_chars.iteritems())
translator = lambda s: s.translate(bad_chars_table)
print translator(u"herenwetgo")

translator = lambda s: re.sub(r'[nbfrtvx00]', ' ', s)

translator = lambda s: reduce(lambda x, (from, to): x.replace(from, to), bad_chars.iteritems(), s)

def translator(s):
    for original, replacement in bad_chars.iteritems():
        s = s.replace(original, replacement)
    return s

print ''.join(map(lambda x: bad_chars.get(x, x), stri))

print ''.join(bad_chars.get(x, x) for x in stri)

bad_chars= {"newline":" ","n": " ", "b":" ", "f":" ", "r":" ", "t":" ", "v":" ", "x00":" "}
stri = "a b stringn with t lots of v bad chars"
print ''.join(bad_chars.get(x, x) for x in stri)

a   string  with   lots of   bad chars

replaced = reduce(lambda stri, r: stri.replace(r[0], r[1]), bad_chars.iteritems(), original)

stri.replace(r0[0], r0[1]).replace(r1[0], r1[1]).replace(...)