Takes a list of number separated by comma as input, sorts the order of numbers, calculates their frequency and returns a sorted list of the result.

sortedfrequency.py

#!/usr/bin/python
print("This is a calculator that takes a series of numbers separated by comma,")
print("calculates their frequency and returns the result in a sorted method.")
print("Press Ctrl+C to exit the calculator")
try:
    while True:
        print("\nEnter your series of numbers separated by a 'comma':")
        numbers = input()
        numbers = numbers.split(",")
        result = {}
        for a in numbers:
            try:
                int(a)
            except ValueError:
                print("Please enter numbers only and separate them by comma.")
                break
        numbers = [int(a) for a in numbers]
        numbers = sorted(numbers)
        counter = 0
        print("Here is a sorted list of numbers and their frequency:")
        for a in numbers:
            try:
                result[a]
            except KeyError:
                for b in numbers:
                    if b == a:
                        counter += 1
                result[a] = counter
                counter = 0
            else:
                continue
        for x, y in sorted(result.items()):
            print (str(x) + " = " + str(y))
except KeyboardInterrupt:
    print("You have exited the 'frequency calculator'")