def even_filter(nums):
    for num in nums:
        if num%2 ==0:
            yield num
def multiply_by_three(nums):
    for num in nums:
        yield num*3
def convert_to_string(nums):
    for num in nums:
        yield 'The Number: %s' % num
if __name__ == '__main__':
    nums=[1,2,3,4,5,6,7,8,9,10]
    pipeline=convert_to_string(multiply_by_three(even_filter(nums)))
    for num in pipeline:
        print(num)