fix py23 compatibility

.travis.yml

@@ -0,0 +1,27 @@
+group: travis_latest
+language: python
+cache: pip
+python:
+    - 2.7
+    - 3.6
+    #- nightly
+    #- pypy
+    #- pypy3
+matrix:
+    allow_failures:
+        - python: nightly
+        - python: pypy
+        - python: pypy3
+install:
+    - pip install -r requirements.txt
+    - pip install flake8  # pytest  # add another testing frameworks later
+before_script:
+    # stop the build if there are Python syntax errors or undefined names
+    - flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics 
+    # exit-zero treats all errors as warnings.  The GitHub editor is 127 chars wide
+    - flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+script:
+    - true  # pytest --capture=sys  # add other tests here
+notifications:
+    on_success: change
+    on_failure: change  # `always` will be the setting once code changes slow down

pocounit/case.py

@@ -1,5 +1,6 @@
 # coding=utf-8
 
+import six
 import sys
 import traceback
 import unittest
@@ -164,7 +165,7 @@ def run(self, result=None):
                 emitter.start()
             except Exception as e:
                 warnings.warn('Fail to start result emitter: "{}". Error message: \n"{}"'
-                              .format(emitter.__class__.__name__, e.message))
+                              .format(emitter.__class__.__name__, six.string_types(e)))
 
         # run test
         ex = None
@@ -202,7 +203,7 @@ def fail(self, msg=None):
         except:
             exc_type, e, exc_tb = sys.exc_info()
             assertionRecorder.fail(msg, str(e), traceback.format_exc())
-            raise exc_type, msg, exc_tb
+            six.reraise(exc_type, exc_type(msg), exc_tb)
 
     # assertions
     def assertTrue(self, expr, msg=None):

setup.py

@@ -11,7 +11,7 @@ def parse_requirements(filename='requirements.txt'):
 
 setup(
     name='pocounit',
-    version='1.0.22',
+    version='1.0.23',
     keywords="PocoUnit unittest",
     description='Unittest framework for poco and airtest',
     packages=find_packages(),