Searching for equivalent of FileNotFoundError in Python 2

Question

I created a class named Options. It works fine but not not with Python 2. And I want it to work on both Python 2 and 3. The problem is identified: FileNotFoundError doesn t

Answer 1

The Python 2 / 3 compatible way to except a FileNotFoundError is this:

import errno

try:
    with open('some_file_that_does_not_exist', 'r'):
        pass
except EnvironmentError as e:
    if e.errno != errno.ENOENT:
        raise

Other answers are close, but don't re-raise if the error number doesn't match.

Using IOError is fine for most cases, but for some reason os.listdir() and friends raise OSError instead on Python 2. Since IOError inherits from OSError it's fine to just always catch OSError and check the error number.

Edit: The previous sentence is only true on Python 3. To be cross compatible, instead catch EnvironmentError and check the error number.