Fix python3 compatibility issues in examples

Change-Id: I024207864668751455874cf3cb60de31cc01de87

taskflow/examples/create_parallel_volume.py

@@ -65,7 +65,7 @@ class VolumeCreator(task.Task):
 
 # Assume there is no ordering dependency between volumes
 flow = uf.Flow("volume-maker")
-for i in xrange(0, VOLUME_COUNT):
+for i in range(0, VOLUME_COUNT):
     flow.add(VolumeCreator(volume_id="vol-%s" % (i)))
 
 if SERIAL:

taskflow/examples/fake_billing.py

@@ -43,7 +43,7 @@ from taskflow.utils import misc
 class AttrDict(object):
     def __init__(self, **kwargs):
         self._attrs = {}
-        for (k, v) in kwargs.iteritems():
+        for (k, v) in kwargs.items():
             if ' ' in k or k in ('self',) or not len(k):
                 raise AttributeError("Invalid attribute name")
             self._attrs[k] = v
@@ -66,7 +66,7 @@ class UrlCaller(object):
 
     def send(self, url, data, status_cb=None):
         sleep_time = float(self._send_time) / 25
-        for i in xrange(0, len(data)):
+        for i in range(0, len(data)):
             time.sleep(sleep_time)
             if status_cb:
                 status_cb(float(i) / len(data))

taskflow/examples/resume_from_backend.out.txt

@@ -8,7 +8,7 @@ executing first==1.0
 After running:
 Flow state: SUSPENDED
 boom==1.0: SUCCESS, result=None
-first==1.0: SUCCESS, result=u'ok'
+first==1.0: SUCCESS, result=ok
 second==1.0: PENDING, result=None
 
 Resuming and running again:
@@ -17,5 +17,5 @@ executing second==1.0
 At the end:
 Flow state: SUCCESS
 boom==1.0: SUCCESS, result=None
-first==1.0: SUCCESS, result=u'ok'
-second==1.0: SUCCESS, result=u'ok'
+first==1.0: SUCCESS, result=ok
+second==1.0: SUCCESS, result=ok

taskflow/examples/resume_from_backend.py

@@ -43,7 +43,7 @@ def print_task_states(flowdetail, msg):
     items = sorted((td.name, td.version, td.state, td.results)
                    for td in flowdetail)
     for item in items:
-        print("%s==%s: %s, result=%r" % item)
+        print("%s==%s: %s, result=%s" % item)
 
 
 def get_backend():

taskflow/examples/resume_many_flows.py

@@ -36,7 +36,7 @@ def _exec(cmd, add_env=None):
     rc = proc.returncode
     if rc != 0:
         raise RuntimeError("Could not run %s [%s]", cmd, rc)
-    print(stdout)
+    print(stdout.decode())
 
 
 def _path_to(name):

taskflow/tests/test_examples.py

@@ -53,8 +53,9 @@ def run_example(name):
         stdout=subprocess.PIPE, stderr=subprocess.PIPE)
     output = obj.communicate()
     if output[1]:
-        raise RuntimeError('Example wrote to stderr:\n%s' % output[1])
-    return output[0]
+        raise RuntimeError('Example wrote to stderr:\n%s'
+                           % output[1].decode())
+    return output[0].decode()
 
 
 def expected_output_path(name):