From 4f349e0ff48c57e27f90ee6f051bfc19eb2e46ae 2019-06-19 00:30:08
From: Matthias Bussonnier <bussonniermatthias@gmail.com>
Date: 2019-06-19 00:30:08
Subject: [PATCH] Merge pull request #11792 from Carreau/textiowrapperleak

Properly close some leaked resources.
---

diff --git a/IPython/testing/tests/test_tools.py b/IPython/testing/tests/test_tools.py
index 4fa5c96..2a6b9e4 100644
--- a/IPython/testing/tests/test_tools.py
+++ b/IPython/testing/tests/test_tools.py
@@ -62,9 +62,8 @@ def test_parser():
 
 def test_temp_pyfile():
     src = 'pass\n'
-    fname, fh = tt.temp_pyfile(src)
+    fname = tt.temp_pyfile(src)
     assert os.path.isfile(fname)
-    fh.close()
     with open(fname) as fh2:
         src2 = fh2.read()
     nt.assert_equal(src2, src)
diff --git a/IPython/testing/tools.py b/IPython/testing/tools.py
index 1d16f11..b2d7df4 100644
--- a/IPython/testing/tools.py
+++ b/IPython/testing/tools.py
@@ -269,20 +269,19 @@ class TempFileMixin(object):
 
     def mktmp(self, src, ext='.py'):
         """Make a valid python temp file."""
-        fname, f = temp_pyfile(src, ext)
+        fname = temp_pyfile(src, ext)
         if not hasattr(self, 'tmps'):
             self.tmps=[]
-        self.tmps.append((f, fname))
+        self.tmps.append(fname)
         self.fname = fname
 
     def tearDown(self):
         # If the tmpfile wasn't made because of skipped tests, like in
         # win32, there's nothing to cleanup.
         if hasattr(self, 'tmps'):
-            for f,fname in self.tmps:
+            for fname in self.tmps:
                 # If the tmpfile wasn't made because of skipped tests, like in
                 # win32, there's nothing to cleanup.
-                f.close()
                 try:
                     os.unlink(fname)
                 except:
diff --git a/IPython/utils/io.py b/IPython/utils/io.py
index b59a1a1..fab9bae 100644
--- a/IPython/utils/io.py
+++ b/IPython/utils/io.py
@@ -205,10 +205,10 @@ def temp_pyfile(src, ext='.py'):
       It is the caller's responsibility to close the open file and unlink it.
     """
     fname = tempfile.mkstemp(ext)[1]
-    f = open(fname,'w')
-    f.write(src)
-    f.flush()
-    return fname, f
+    with open(fname,'w') as f:
+        f.write(src)
+        f.flush()
+    return fname
 
 @undoc
 def atomic_writing(*args, **kwargs):
diff --git a/IPython/utils/openpy.py b/IPython/utils/openpy.py
index d544f41..3046c31 100644
--- a/IPython/utils/openpy.py
+++ b/IPython/utils/openpy.py
@@ -32,12 +32,12 @@ def source_to_unicode(txt, errors='replace', skip_encoding_cookie=True):
     except SyntaxError:
         encoding = "ascii"
     buffer.seek(0)
-    text = TextIOWrapper(buffer, encoding, errors=errors, line_buffering=True)
-    text.mode = 'r'
-    if skip_encoding_cookie:
-        return u"".join(strip_encoding_cookie(text))
-    else:
-        return text.read()
+    with TextIOWrapper(buffer, encoding, errors=errors, line_buffering=True) as text:
+        text.mode = 'r'
+        if skip_encoding_cookie:
+            return u"".join(strip_encoding_cookie(text))
+        else:
+            return text.read()
 
 def strip_encoding_cookie(filelike):
     """Generator to pull lines from a text-mode file, skipping the encoding
diff --git a/IPython/utils/tests/test_openpy.py b/IPython/utils/tests/test_openpy.py
index 5a01ac4..9e66d43 100644
--- a/IPython/utils/tests/test_openpy.py
+++ b/IPython/utils/tests/test_openpy.py
@@ -5,27 +5,35 @@ import nose.tools as nt
 from IPython.utils import openpy
 
 mydir = os.path.dirname(__file__)
-nonascii_path = os.path.join(mydir, '../../core/tests/nonascii.py')
+nonascii_path = os.path.join(mydir, "../../core/tests/nonascii.py")
+
 
 def test_detect_encoding():
-    with open(nonascii_path, 'rb') as f:
+    with open(nonascii_path, "rb") as f:
         enc, lines = openpy.detect_encoding(f.readline)
-    nt.assert_equal(enc, 'iso-8859-5')
+    nt.assert_equal(enc, "iso-8859-5")
+
 
 def test_read_file():
-    read_specified_enc = io.open(nonascii_path, encoding='iso-8859-5').read()
+    with io.open(nonascii_path, encoding="iso-8859-5") as f:
+        read_specified_enc = f.read()
     read_detected_enc = openpy.read_py_file(nonascii_path, skip_encoding_cookie=False)
     nt.assert_equal(read_detected_enc, read_specified_enc)
-    assert u'coding: iso-8859-5' in read_detected_enc
-    
-    read_strip_enc_cookie = openpy.read_py_file(nonascii_path, skip_encoding_cookie=True)
-    assert u'coding: iso-8859-5' not in read_strip_enc_cookie
+    assert "coding: iso-8859-5" in read_detected_enc
+
+    read_strip_enc_cookie = openpy.read_py_file(
+        nonascii_path, skip_encoding_cookie=True
+    )
+    assert "coding: iso-8859-5" not in read_strip_enc_cookie
+
 
 def test_source_to_unicode():
-    with io.open(nonascii_path, 'rb') as f:
+    with io.open(nonascii_path, "rb") as f:
         source_bytes = f.read()
-    nt.assert_equal(openpy.source_to_unicode(source_bytes, skip_encoding_cookie=False).splitlines(),
-                    source_bytes.decode('iso-8859-5').splitlines())
+    nt.assert_equal(
+        openpy.source_to_unicode(source_bytes, skip_encoding_cookie=False).splitlines(),
+        source_bytes.decode("iso-8859-5").splitlines(),
+    )
 
     source_no_cookie = openpy.source_to_unicode(source_bytes, skip_encoding_cookie=True)
-    nt.assert_not_in(u'coding: iso-8859-5', source_no_cookie)
+    nt.assert_not_in("coding: iso-8859-5", source_no_cookie)