An easy to understand Python code.

However, I believe there must be many ways to make this code faster :).

please post your suggestions.

Thanks in advance

```
import operator
class Solution(object):
def frequencySort(self, s):
x = {}
for k in s:
x[k] = x.get(k, 0) + 1
sorted_x = sorted(x.items(), key=operator.itemgetter(1), reverse=True)
result = ""
for i in sorted_x:
result = result + i[0] * i[1]
return result
```