如何在 Python 中检测文件是否为二进制(非文本)文

问题描述

如何在 Python 中判断文件是否为二进制(非文本)文件?

How can I tell if a file is binary (non-text) in Python?

我在 Python 中搜索大量文件，并不断在二进制文件中找到匹配项.这使得输出看起来非常混乱.

I am searching through a large set of files in Python, and keep getting matches in binary files. This makes the output look incredibly messy.

我知道我可以使用 grep -I，但我对数据所做的工作超出了 grep 所允许的范围.

I know I could use grep -I, but I am doing more with the data than what grep allows for.

在过去，我只会搜索大于 0x7f 的字符，但 utf8 等在现代系统上是不可能的.理想情况下，解决方案会很快.

In the past, I would have just searched for characters greater than 0x7f, but utf8 and the like, make that impossible on modern systems. Ideally, the solution would be fast.

推荐答案

你也可以使用 mimetypes 模块:

You can also use the mimetypes module:

import mimetypes
...
mime = mimetypes.guess_type(file)

编译二进制mime 类型列表相当容易.例如，Apache 分发了一个 mime.types 文件，您可以将其解析为一组列表、二进制和文本，然后检查 mime 是否在您的文本或二进制列表中.

It's fairly easy to compile a list of binary mime types. For example Apache distributes with a mime.types file that you could parse into a set of lists, binary and text and then check to see if the mime is in your text or binary list.

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