fibonacci in erlang & python

fibonacci.erl

-module(fibonacci).
-export([calculate/1]).

fibonacci(_, _, Count, Count) ->
    ok;
fibonacci(A, B, Num, Count) ->
    io:format("~w~n", [A]),
    fibonacci(B, A + B, Num, Count + 1).

calculate(Number) ->
    io:format("Calculating Fibonacci Serial..~n"),
    fibonacci(0, 1, Number, 0).

fibonacci.py

import sys


class Fibonacci(object):
    def __init__(self, limit):
        self.limit = limit
        self.start_list = [0, 1]

    def calculate(self):
        result = self.start_list
        print("Calculating Fibonacci Serial..")
        for i in range(self.limit - len(result)):
            next_value = sum(result[-2:])
            result.append(next_value)

        return result

    def print_result(self):
        result = self.calculate()
        for value in result:
            print(value)


if __name__ == '__main__':
    try:
        limit = int(sys.argv[1])
        fibonacci = Fibonacci(limit)
        fibonacci.print_result()

    except ValueError, e:
        print("First argument should be integer.")
        sys.exit(e)

    except IndexError, e:
        print("An argument required for setting limit.")
        sys.exit(e)