demo_5_5_generator.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
def triangles ():
    List = [1]
    while True:
        yield List
        List =[1] + [value + List[index - 1] for index, value in enumerate(List) if index - 1 >= 0] + [1]

# test
if __name__ == '__main__':
    # should be
    # [1]
    # [1, 1]
    # [1, 2, 1]
    # [1, 3, 3, 1]
    # [1, 4, 6, 4, 1]
    # [1, 5, 10, 10, 5, 1]
    # [1, 6, 15, 20, 15, 6, 1]
    # [1, 7, 21, 35, 35, 21, 7, 1]
    # [1, 8, 28, 56, 70, 56, 28, 8, 1]
    # [1, 9, 36, 84, 126, 126, 84, 36, 9, 1]
    n = 0
    results = []
    for t in triangles():
        print(t)
        results.append(t)
        n = n + 1
        if n == 10:
            break
    if results == [
        [1],
        [1, 1],
        [1, 2, 1],
        [1, 3, 3, 1],
        [1, 4, 6, 4, 1],
        [1, 5, 10, 10, 5, 1],
        [1, 6, 15, 20, 15, 6, 1],
        [1, 7, 21, 35, 35, 21, 7, 1],
        [1, 8, 28, 56, 70, 56, 28, 8, 1],
        [1, 9, 36, 84, 126, 126, 84, 36, 9, 1]
    ]:
        print('测试通过!')
    else:
        print('测试失败!')