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1#!/usr/bin/env python3 

2 

3"""Solution to chapter 7, exercise 28: comma_range""" 

4 

5 

6def join_numbers(numbers): 

7 """Takes an iterable of numbers as input. 

8Output is a string containing the numbers in that iterable, 

9separated by commas. 

10""" 

11 return ','.join(str(number) 

12 for number in numbers)