diff --git a/pyqtgraph/configfile.py b/pyqtgraph/configfile.py
index a4ad9191..674c1620 100644
--- a/pyqtgraph/configfile.py
+++ b/pyqtgraph/configfile.py
@@ -12,6 +12,7 @@ as it can be converted to/from a string using repr and eval.
 import re, os, sys, datetime
 import numpy
 from collections import OrderedDict
+import tempfile
 from . import units
 from .python2_3 import asUnicode, basestring
 from .Qt import QtCore
@@ -187,11 +188,8 @@ def measureIndent(s):
     while n < len(s) and s[n] == ' ':
         n += 1
     return n
-    
-    
-    
+
 if __name__ == '__main__':
-    import tempfile
     cf = """
 key: 'value'
 key2:              ##comment
@@ -201,16 +199,13 @@ key2:              ##comment
     key22: [1,2,3]
     key23: 234  #comment
     """
-    fn = tempfile.mktemp()
-    with open(fn, 'w') as tf:
-        tf.write(cf)
-    print("=== Test:===")
-    num = 1
-    for line in cf.split('\n'):
-        print("%02d   %s" % (num, line))
-        num += 1
-    print(cf)
-    print("============")
-    data = readConfigFile(fn)
+    with tempfile.NamedTemporaryFile(encoding="utf-8") as tf:
+        tf.write(cf.encode("utf-8"))
+        print("=== Test:===")
+        for num, line in enumerate(cf.split('\n'), start=1):
+            print("%02d   %s" % (num, line))
+        print(cf)
+        print("============")
+        data = readConfigFile(tf.name)
     print(data)
-    os.remove(fn)
+    
diff --git a/pyqtgraph/metaarray/MetaArray.py b/pyqtgraph/metaarray/MetaArray.py
index b07f66ab..92930cae 100644
--- a/pyqtgraph/metaarray/MetaArray.py
+++ b/pyqtgraph/metaarray/MetaArray.py
@@ -1330,8 +1330,6 @@ if __name__ == '__main__':
     #### File I/O tests
     
     print("\n================  File I/O Tests  ===================\n")
-    import tempfile
-    tf = tempfile.mktemp()
     tf = 'test.ma'
     # write whole array
     
diff --git a/tests/exporters/test_csv.py b/tests/exporters/test_csv.py
index 0772d34e..bcb7fcaf 100644
--- a/tests/exporters/test_csv.py
+++ b/tests/exporters/test_csv.py
@@ -4,7 +4,6 @@ CSV export test
 from __future__ import division, print_function, absolute_import
 import pyqtgraph as pg
 import csv
-import os
 import tempfile
 
 app = pg.mkQApp()
@@ -15,9 +14,6 @@ def approxeq(a, b):
 
 
 def test_CSVExporter():
-    tempfilename = tempfile.NamedTemporaryFile(suffix='.csv').name
-    print("using %s as a temporary file" % tempfilename)
-
     plt = pg.plot()
     y1 = [1,3,2,3,1,6,9,8,4,2]
     plt.plot(y=y1, name='myPlot')
@@ -31,11 +27,10 @@ def test_CSVExporter():
     plt.plot(x=x3, y=y3, stepMode="center")
 
     ex = pg.exporters.CSVExporter(plt.plotItem)
-    ex.export(fileName=tempfilename)
-
-    with open(tempfilename, 'r') as csv_file:
-        r = csv.reader(csv_file)
-        lines = [line for line in r]
+    with tempfile.NamedTemporaryFile(mode="w+t", suffix='.csv', encoding="utf-8", delete=False) as tf:
+        print("using %s as a temporary file" % tf.name)
+        ex.export(fileName=tf.name)
+        lines = [line for line in csv.reader(tf)]
     header = lines.pop(0)
     assert header == ['myPlot_x', 'myPlot_y', 'x0001', 'y0001', 'x0002', 'y0002']
 
@@ -49,4 +44,3 @@ def test_CSVExporter():
 
         assert (i >= len(x3) and vals[4] == '') or approxeq(float(vals[4]), x3[i])
         assert (i >= len(y3) and vals[5] == '') or approxeq(float(vals[5]), y3[i])
-    os.unlink(tempfilename)