In [4]:

    

shapes = ['circle','square','triangle','circle']


    

In [5]:

    

setOfShapes = set(shapes)


    

In [6]:

    

setOfShapes


    

    
Out[6]:





set(['circle', 'square', 'triangle'])

In [7]:

    

setOfShapes.add('polygon')


    

In [8]:

    

setOfShapes


    

    
Out[8]:





set(['circle', 'square', 'triangle', 'polygon'])

In [9]:

    

'circle' in setOfShapes


    

    
Out[9]:





True

In [12]:

    

'rhombus' in setOfShapes


    

    
Out[12]:





False

In [13]:

    

favoriteShapes = ['circle','triangle','hexagon']


    

In [14]:

    

setOfFavoriteShapes = set(favoriteShapes)


    

In [15]:

    

setOfShapes - setOfFavoriteShapes


    

    
Out[15]:





set(['square', 'polygon'])

In [16]:

    

setOfShapes & setOfFavoriteShapes


    

    
Out[16]:





set(['circle', 'triangle'])

In [17]:

    

setOfShapes | setOfFavoriteShapes


    

    
Out[17]:





set(['square', 'triangle', 'polygon', 'circle', 'hexagon'])

In [ ]: