From aa50296b9fe44da3e8131ed04c101ac4f32ad380 Mon Sep 17 00:00:00 2001
From: Ogi <ognyan.moore@gmail.com>
Date: Sun, 12 May 2019 17:30:40 -0700
Subject: [PATCH 1/3] gc.collect() causes segfault on pyside2, test will pass
 on pyqt5 bindings (did not test pyqt4 or pyside1)

---
 pyqtgraph/tests/test_qt.py | 1 -
 1 file changed, 1 deletion(-)

diff --git a/pyqtgraph/tests/test_qt.py b/pyqtgraph/tests/test_qt.py
index bfb98631..c86cd500 100644
--- a/pyqtgraph/tests/test_qt.py
+++ b/pyqtgraph/tests/test_qt.py
@@ -10,7 +10,6 @@ def test_isQObjectAlive():
     o2 = pg.QtCore.QObject()
     o2.setParent(o1)
     del o1
-    gc.collect()
     assert not pg.Qt.isQObjectAlive(o2)
 
 @pytest.mark.skipif(pg.Qt.QT_LIB == 'PySide', reason='pysideuic does not appear to be '

From d873ee6b264bcdc9897ce3206599877637dc78cf Mon Sep 17 00:00:00 2001
From: Ogi <ognyan.moore@gmail.com>
Date: Sun, 12 May 2019 17:31:12 -0700
Subject: [PATCH 2/3] fixes ImportError on importing pysideuic

---
 pyqtgraph/Qt.py | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/pyqtgraph/Qt.py b/pyqtgraph/Qt.py
index 88c27e27..696d65f5 100644
--- a/pyqtgraph/Qt.py
+++ b/pyqtgraph/Qt.py
@@ -100,10 +100,13 @@ def _loadUiType(uiFile):
     how to make PyQt4 and pyside look the same...
         http://stackoverflow.com/a/8717832
     """
-    import pysideuic
+
+    if QT_LIB == "PYSIDE":
+        import pysideuic
+    else:
+        import pyside2uic as pysideuic
     import xml.etree.ElementTree as xml
-    #from io import StringIO
-    
+
     parsed = xml.parse(uiFile)
     widget_class = parsed.find('widget').get('class')
     form_class = parsed.find('class').text

From afb665ec992264f134607fb02cd81e6c311d67f2 Mon Sep 17 00:00:00 2001
From: Ogi <ognyan.moore@gmail.com>
Date: Sun, 12 May 2019 17:35:26 -0700
Subject: [PATCH 3/3] make use of shiboken2 directly for isValid method

---
 pyqtgraph/Qt.py | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/pyqtgraph/Qt.py b/pyqtgraph/Qt.py
index 696d65f5..0941c3c7 100644
--- a/pyqtgraph/Qt.py
+++ b/pyqtgraph/Qt.py
@@ -219,8 +219,12 @@ elif QT_LIB == PYSIDE2:
     except ImportError as err:
         QtTest = FailedImport(err)
 
-    isQObjectAlive = _isQObjectAlive
-    
+    try:
+        import shiboken2
+        isQObjectAlive = shiboken2.isValid
+    except ImportError:
+        # use approximate version
+        isQObjectAlive = _isQObjectAlive    
     import PySide2
     VERSION_INFO = 'PySide2 ' + PySide2.__version__ + ' Qt ' + QtCore.__version__