Remove py3compat.open in favour of io.open

docs/source/whatsnew/pr/incompat-py3compat-open.rst

@@ -0,0 +1,2 b''
+* ``IPython.utils.py3compat.open`` was removed: :func:`io.open` provides all
+  the same functionality.

IPython/core/tests/test_history.py

@@ -6,6 +6,7 b''
 #-----------------------------------------------------------------------------
 
 # stdlib
+import io
 import os
 import sys
 import tempfile
@@ -124,7 +125,7 b' def test_history():'
             # Cross testing: check that magic %save can get previous session.
             testfilename = os.path.realpath(os.path.join(tmpdir, "test.py"))
             ip.magic("save " + testfilename + " ~1/1-3")
-            with py3compat.open(testfilename, encoding='utf-8') as testfile:
+            with io.open(testfilename, encoding='utf-8') as testfile:
                 nt.assert_equal(testfile.read(),
                                         u"# coding: utf-8\n" + u"\n".join(hist)+u"\n")
 

IPython/utils/py3compat.py

@@ -8,8 +8,6 b' import types'
 
 from .encoding import DEFAULT_ENCODING
 
-orig_open = open
-
 def no_code(x, encoding=None):
     return x
 
@@ -96,8 +94,7 b' if sys.version_info[0] >= 3:'
         if dotted:
             return all(isidentifier(a) for a in s.split("."))
         return s.isidentifier()
-    
-    open = orig_open
+
     xrange = range
     def iteritems(d): return iter(d.items())
     def itervalues(d): return iter(d.values())
@@ -164,27 +161,6 b' else:'
             return all(isidentifier(a) for a in s.split("."))
         return bool(_name_re.match(s))
     
-    class open(object):
-        """Wrapper providing key part of Python 3 open() interface."""
-        def __init__(self, fname, mode="r", encoding="utf-8"):
-            self.f = orig_open(fname, mode)
-            self.enc = encoding
-        
-        def write(self, s):
-            return self.f.write(s.encode(self.enc))
-        
-        def read(self, size=-1):
-            return self.f.read(size).decode(self.enc)
-        
-        def close(self):
-            return self.f.close()
-        
-        def __enter__(self):
-            return self
-        
-        def __exit__(self, etype, value, traceback):
-            self.f.close()
-    
     xrange = xrange
     def iteritems(d): return d.iteritems()
     def itervalues(d): return d.itervalues()