[ARROW-7282] [Python] IO functions should raise FileNotFoundError when appropriate

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.15.1
• Fix Version/s: 0.16.0
• Component/s: C++, Python
• Labels: exception-reporting pull-request-available pyarrow
• Environment: Arch Linux, Python 3.7
• External issue URL: https://github.com/apache/arrow/issues/23571
• Assignee: Antoine Pitrou
• Reporter: Scott Gigante
• Created: 01/Dec/19 20:28
• Updated: 11/Jan/23 07:52
• Resolved: 17/Dec/19 18:49

Description

I get the following error when trying to open a file that does not exist.

```
pyarrow.lib.ArrowIOError: Failed to open local file 'filename', error: No such file or directory

```

In my opinion, this particular error should also subclass from Python FileNotFoundError. It currently only inherits from IOError (which is a superclass of FileNotFoundError).

```
>>> import pyarrow
>>> try:
...     raise pyarrow.lib.ArrowIOError
... except IOError:
...     pass
...
>>> try:
...     raise pyarrow.lib.ArrowIOError
... except FileNotFoundError:
...     print('caught')
...
Traceback (most recent call last):
File "<stdin>", line 2, in <module>
pyarrow.lib.ArrowIOError
>>> try:
...     raise pyarrow.lib.ArrowIOError
... except IOError:
...     print('caught')
...
caught
```

Issue Links

• supercedes: ARROW-6851 [Python] Should OSError be FileNotFoundError?
• links to: GitHub Pull Request #5960