fix for issue 410.11.15

4 files changed, 12 insertions, 4 deletions

diff --git a/Dockerfile b/Dockerfile
index 20151c6..8d75095 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,6 +3,7 @@ FROM quay.io/pypa/manylinux1_x86_64
 MAINTAINER Anthon van der Neut <a.van.der.neut@ruamel.eu>
 
 RUN echo 'cd /src' > /usr/bin/makewheel
+RUN echo 'rm -f /tmp/*.whl'                         >> /usr/bin/makewheel
 RUN echo 'for PYBIN in /opt/python/$1*/bin/; do'    >> /usr/bin/makewheel
 RUN echo '  echo "$PYBIN"'                          >> /usr/bin/makewheel
 RUN echo '  ${PYBIN}/pip wheel . -w /tmp'           >> /usr/bin/makewheel
@@ -16,4 +17,4 @@ RUN chmod 755 /usr/bin/makewheel
 RUN yum install -y libyaml-devel
 
 
-CMD /usr/bin/makewheel
\ No newline at end of file
+CMD /usr/bin/makewheel
diff --git a/README.rst b/README.rst
index f5daafe..993cf35 100644
--- a/README.rst
+++ b/README.rst
@@ -18,8 +18,12 @@ ChangeLog
 
 ::
 
+  0.11.15 (2016-XX-XX):
+    - Change to prevent FutureWarning in NumPy, as reported by tgehring
+    ("comparison to None will result in an elementwise object comparison in the future")
+
   0.11.14 (2016-07-06):
-    - fix preserve_quotes missing on original Loaders (as reported 
+    - fix preserve_quotes missing on original Loaders (as reported
       by Leynos, bitbucket issue 38)
 
   0.11.13 (2016-07-06):
diff --git a/__init__.py b/__init__.py
index 1ff3424..b77032f 100644
--- a/__init__.py
+++ b/__init__.py
@@ -9,7 +9,7 @@ from __future__ import absolute_import
 
 _package_data = dict(
     full_package_name="ruamel.yaml",
-    version_info=(0, 11, 14),
+    version_info=(0, 11, 15),
     author="Anthon van der Neut",
     author_email="a.van.der.neut@ruamel.eu",
     description="ruamel.yaml is a YAML parser/emitter that supports roundtrip preservation of comments, seq/map flow style, and map key order",  # NOQA
diff --git a/representer.py b/representer.py
index 7498443..b4625bf 100644
--- a/representer.py
+++ b/representer.py
@@ -199,7 +199,10 @@ class BaseRepresenter(object):
 class SafeRepresenter(BaseRepresenter):
 
     def ignore_aliases(self, data):
-        if data in [None, ()]:
+        # https://docs.python.org/3/reference/expressions.html#parenthesized-forms :
+        # "i.e. two occurrences of the empty tuple may or may not yield the same object"
+        # so "data is ()" should not be used
+        if data is None or data == ():
             return True
         if isinstance(data, (binary_type, text_type, bool, int, float)):
             return True