#!/usr/bin/env python
# coding: utf-8

# # Displaying a spinner during a long-running jub

# In[5]:


import sys, time

def job(t):
    print("starting")
    sys.stdout.flush()
    time.sleep(t)
    print("done")


# In[6]:


from IPython.display import display
from ipywidgets import HTML
from contextlib import contextmanager

@contextmanager
def spinner():
    spin = HTML("<img src='http://spiffygif.com/gif'>")
    display(spin)
    yield
    print()
    spin.close()


# In[8]:


with spinner():
    job(5)