MAINT: io.open → open

In Python 3, io.open() is an alias for the builtin open() function:
https://docs.python.org/3/library/io.html#io.open

Author: DimitriPapadopoulos

numpy/core/tests/test_multiarray.py

@@ -5361,15 +5361,15 @@ def test_unseekable_fromfile(self, x, tmp_filename):
         def fail(*args, **kwargs):
             raise OSError('Can not tell or seek')
 
-        with io.open(tmp_filename, 'rb', buffering=0) as f:
+        with open(tmp_filename, 'rb', buffering=0) as f:
             f.seek = fail
             f.tell = fail
             assert_raises(OSError, np.fromfile, f, dtype=x.dtype)
 
     def test_io_open_unbuffered_fromfile(self, x, tmp_filename):
         # gh-6632
         x.tofile(tmp_filename)
-        with io.open(tmp_filename, 'rb', buffering=0) as f:
+        with open(tmp_filename, 'rb', buffering=0) as f:
             y = np.fromfile(f, dtype=x.dtype)
             assert_array_equal(y, x.flat)
 
@@ -5396,7 +5396,7 @@ def test_largish_file(self, tmp_filename):
     def test_io_open_buffered_fromfile(self, x, tmp_filename):
         # gh-6632
         x.tofile(tmp_filename)
-        with io.open(tmp_filename, 'rb', buffering=-1) as f:
+        with open(tmp_filename, 'rb', buffering=-1) as f:
             y = np.fromfile(f, dtype=x.dtype)
         assert_array_equal(y, x.flat)
 

numpy/lib/_datasource.py

@@ -35,7 +35,6 @@
 
 """
 import os
-import io
 
 from .._utils import set_module
 
@@ -98,7 +97,7 @@ class _FileOpeners:
 
     def __init__(self):
         self._loaded = False
-        self._file_openers = {None: io.open}
+        self._file_openers = {None: open}
 
     def _load(self):
         if self._loaded:
@@ -173,7 +172,7 @@ def open(path, mode='r', destpath=os.curdir, encoding=None, newline=None):
         The default path is the current directory.
     encoding : {None, str}, optional
         Open text file with given encoding. The default encoding will be
-        what `io.open` uses.
+        what `open` uses.
     newline : {None, str}, optional
         Newline to use when reading text file.
 
@@ -501,7 +500,7 @@ def open(self, path, mode='r', encoding=None, newline=None):
             specified by `path`. Default is 'r'.
         encoding : {None, str}, optional
             Open text file with given encoding. The default encoding will be
-            what `io.open` uses.
+            what `open` uses.
         newline : {None, str}, optional
             Newline to use when reading text file.
 
@@ -670,7 +669,7 @@ def open(self, path, mode='r', encoding=None, newline=None):
             specified by `path`. Default is 'r'.
         encoding : {None, str}, optional
             Open text file with given encoding. The default encoding will be
-            what `io.open` uses.
+            what `open` uses.
         newline : {None, str}, optional
             Newline to use when reading text file.
 

numpy/lib/tests/test_io.py

@@ -5,7 +5,6 @@
 import threading
 import time
 import warnings
-import io
 import re
 import pytest
 from pathlib import Path
@@ -701,7 +700,7 @@ def test_converters_nodecode(self):
         # test native string converters enabled by setting an encoding
         utf8 = b'\xcf\x96'.decode('UTF-8')
         with temppath() as path:
-            with io.open(path, 'wt', encoding='UTF-8') as f:
+            with open(path, 'wt', encoding='UTF-8') as f:
                 f.write(utf8)
             x = self.loadfunc(path, dtype=np.str_,
                               converters={0: lambda x: x + 't'},
@@ -2264,7 +2263,7 @@ def test_utf8_file_nodtype_unicode(self):
 
         # skip test if cannot encode utf8 test string with preferred
         # encoding. The preferred encoding is assumed to be the default
-        # encoding of io.open. Will need to change this for PyTest, maybe
+        # encoding of open. Will need to change this for PyTest, maybe
         # using pytest.mark.xfail(raises=***).
         try:
             encoding = locale.getpreferredencoding()
@@ -2274,7 +2273,7 @@ def test_utf8_file_nodtype_unicode(self):
                         'unable to encode utf8 in preferred encoding')
 
         with temppath() as path:
-            with io.open(path, "wt") as f:
+            with open(path, "wt") as f:
                 f.write("norm1,norm2,norm3\n")
                 f.write("norm1," + latin1 + ",norm3\n")
                 f.write("test1,testNonethe" + utf8 + ",test3\n")