Add user events in dif columns

My idea is to move on from this

df2 = pd.DataFrame({'usuario': [1,1,1,2,2,2,3,3,3,3,3], 
                    'evento': ["compro","compro","viopag","viopag","entropag","compro","entropag",
                               "compro","salio","viopag","compro"]})

To this

df3 = pd.DataFrame({ 'usuario' : [1,2,3], 
                     'compro' :[2,1,2], 
                     'viopag' :[1,1,1], 
                     'entropag' :[0,1,1], 
                     'salio' : [0,0,1]})