Synchronise the openstack bugs

When run unittests through tox, some test cases are always error,
the errors are already done in openstack community, so it's
necessary to synchronise the fixes.

Change-Id: Ib29078e6cc138a474e89c6a2cc90ad7a1db1bb46
JIRA: PARSER-63
Signed-off-by: shangxdy <shang.xiaodong@zte.com.cn>

1 files changed, 8 insertions, 2 deletions

diff --git a/tosca2heat/heat-translator/translator/common/utils.py b/tosca2heat/heat-translator/translator/common/utils.py
index 459b5ee..8e4b690 100644
--- a/tosca2heat/heat-translator/translator/common/utils.py
+++ b/tosca2heat/heat-translator/translator/common/utils.py
@@ -18,6 +18,7 @@ import numbers
 import os
 import re
 import requests
+import six
 from six.moves.urllib.parse import urlparse
 import yaml
 
@@ -262,12 +263,17 @@ class UrlUtils(object):
 
 def str_to_num(value):
     """Convert a string representation of a number into a numeric type."""
-    if isinstance(value, numbers.Number):
+    if isinstance(value, numbers.Number) \
+            or isinstance(value, six.integer_types) \
+            or isinstance(value, float):
         return value
     try:
         return int(value)
     except ValueError:
-        return float(value)
+        try:
+            return float(value)
+        except ValueError:
+            return None
 
 
 def check_for_env_variables():