
class MyWorkflow(object):
    def __init__(self):
        pass

    def step3(self, session_time = None):
        print "Step3 of session %s" % session_time



class MyWorkflow(object):
    def __init__(self):
        pass

    def step3(self, session_time = None):
        print("Step3 of session {0}".format(session_time))


Fix an example of python task
Fix an example of python task

The original python print method doesn't work on python3.
print(format) method works on python2 and python 3.