fix regression with py27

jcupitt · jcupitt · commit bf00a21b8ff5 · 2019-07-01T20:36:02.000+01:00
oops nonlocal is not supported in py2
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
@@ -1,5 +1,9 @@
 # master 
 
+## Version 2.1.8 (1 Jul 2019)
+
+* fix regression with py27 [jcupitt]
+
 ## Version 2.1.7 (1 Jul 2019)
 
 * prevent exponential growth of reference tables in some cases [NextGuido]
diff --git a/doc/conf.py b/doc/conf.py
@@ -66,7 +66,7 @@
 # The short X.Y version.
 version = u'2.1'
 # The full version, including alpha/beta/rc tags.
-release = u'2.1.7'
+release = u'2.1.8'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/pyvips/version.py b/pyvips/version.py
@@ -1,4 +1,4 @@
 # this is execfile()d into setup.py imported into __init__.py
-__version__ = '2.1.7'
+__version__ = '2.1.8'
 
 __all__ = ['__version__']
diff --git a/pyvips/voperation.py b/pyvips/voperation.py
@@ -219,12 +219,11 @@ def call(operation_name, *args, **kwargs):
         references = []
 
         def add_reference(x):
-            nonlocal references
-
             if isinstance(x, pyvips.Image):
                 for i in x._references:
                     if i not in references:
-                        references += [i]
+                        # references += [i] won't work with py27
+                        references.append(i)
 
             return False
 
