Python的StringIO在`with`语句中表现不佳 [英] Python's StringIO doesn't do well with `with` statements

问题描述

我需要对tempfile进行存根，并且StringIO看起来很完美.只是所有这些都失败了:

I need to stub tempfile and StringIO seemed perfect. Only that all this fails in an omission:

In [1]: from StringIO import StringIO
In [2]: with StringIO("foo") as f: f.read()

--> AttributeError: StringIO instance has no attribute '__exit__'

提供罐装信息而不是读取不确定内容的文件的常用方法是什么?

What's the usual way to provide canned info instead of reading files with nondeterministic content?

推荐答案

StringIO模块早于with语句.由于StringIO 无论如何，只要在Python 3中将其删除，就可以使用其替换 io.BytesIO :

The StringIO module predates the with statement. Since StringIO has been removed in Python 3 anyways, you can just use its replacement, io.BytesIO:

>>> import io
>>> with io.BytesIO(b"foo") as f: f.read()
b'foo'

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