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https://issues.apache.org/jira/browse/ARROW-2036?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16345719#comment-16345719
]
ASF GitHub Bot commented on ARROW-2036:
---------------------------------------
jcrist commented on a change in pull request #1517: ARROW-2036: [Python]
Support standard IOBase methods on NativeFile
URL: https://github.com/apache/arrow/pull/1517#discussion_r164863482
##########
File path: python/pyarrow/io.pxi
##########
@@ -65,45 +66,63 @@ cdef class NativeFile:
def __get__(self):
# Emulate built-in file modes
- if self.is_readable and self.is_writeable:
+ if self.is_readable and self.is_writable:
return 'rb+'
elif self.is_readable:
return 'rb'
- elif self.is_writeable:
+ elif self.is_writable:
return 'wb'
else:
raise ValueError('File object is malformed, has no mode')
+ def readable(self):
+ self._assert_open()
+ return self.is_readable
+
+ def writable(self):
+ self._assert_open()
+ return self.is_writable
+
+ def seekable(self):
+ self._assert_open()
+ return self.is_readable
Review comment:
The `seekable`/`readable`/`writable`? No, this is required for the python
file interface. See https://docs.python.org/3/library/io.html#io.IOBase
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> NativeFile should support standard IOBase methods
> -------------------------------------------------
>
> Key: ARROW-2036
> URL: https://issues.apache.org/jira/browse/ARROW-2036
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Python
> Reporter: Jim Crist
> Priority: Minor
> Labels: pull-request-available
>
> If `NativeFile` supported most/all of the standard IOBase methods
> ([https://docs.python.org/3/library/io.html#io.IOBase),] then it'd be easier
> to use arrow files with other python libraries. Would at least be nice to
> support enough operations to use `io.TextIOWrapper`.
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