Counting

countingstuff

In [1]: stuff = ["a", "a", "c", "b", "b", "b"]                                                                                                                                                                     

In [2]: counter = {}                                                                                                                                                                                               

In [3]: for element in stuff: 
   ...:     if element not in counter.keys(): 
   ...:         counter[element] = 0 
   ...:     counter[element] += 1 
   ...:                                                                                                                                                                                                            

In [4]: counter                                                                                                                                                                                                    
Out[4]: {'a': 2, 'c': 1, 'b': 3}