如何使用Python识别二进制文件和文本文件？[重复]

谢谢大家，我找到了适合我问题的解决方案。我在http://pre.activestate.com/recipes/173220/上找到了此代码，并做了一些修改以适合我。

它工作正常。

from __future__ import divisionimport stringdef istext(filename):    s=open(filename).read(512)    text_characters = "".join(map(chr, range(32, 127)) + list("nrtb"))    _null_trans = string.maketrans("", "")    if not s:        # Empty files are considered text        return True    if "" in s:        # Files with null bytes are likely binary        return False    # Get the non-text characters (maps a character to itself then    # use the 'remove' option to get rid of the text characters.)    t = s.translate(_null_trans, text_characters)    # If more than 30% non-text characters, then    # this is considered a binary file    if float(len(t))/float(len(s)) > 0.30:        return False    return True