[Tutor] Counting number of occurrence of each character in a string

[Manprit Singh]

Dear sir ,
consider a problem of Counting number of occurrence of each  character in a
string
x = "ABRACADABRA"
in this string x :
Number of occurrence of   character A = 5
Number of occurrence of   character B = 2
Number of occurrence of   character R = 2
Number of occurrence of   character C = 1
Number of occurrence of   character D = 5

The code will be written like this :

>>> a = "ABRACADABRA"
>>> d = {}
>>> for i in a:
            d[i] = d.get(i, 0) + 1

will result in
>>> d
{'A': 5, 'B': 2, 'R': 2, 'C': 1, 'D': 1}

Here keys are characters in the string a, and the values are the counts.

in an another way the same result can be achieved by replacing d[i] =
d.get(i, 0) + 1 with  dict .update () method,as the code written below :

a = "ABRACADABRA"
>>> d = {}
>>> for i in a:
            d.update({i : d.get(i, 0) + 1})

The result  again is
>>> d
{'A': 5, 'B': 2, 'R': 2, 'C': 1, 'D': 1}

So in this situation which way should be adopted, :
1) The code with d[i] = d.get(i, 0) + 1 inside for loop
                          OR
2) The code with d.update({i : d.get(i, 0) + 1})

Regards
Manprit Singh