53 lines
1.7 KiB
Python
53 lines
1.7 KiB
Python
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if __name__ == '__main__':
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def fbb(start, stop, step):
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x = start
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while x <= stop:
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yield x
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x += step
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# 上面是一个生成器函数，它只会在相应迭代时运行
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# 在调用生成器函数的时候，因为直接生成了数字，所以有返回值
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for i in fbb(0, 10, 1):
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print(i)
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# 尝试使用fbb生成金字塔
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# 先用生成器整一个斐波那契数列生成函数
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def fbb_arr(n):
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index = 0
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a0 = 1
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a1 = 1
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while index < n:
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yield a0
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a0, a1 = a1, a0 + a1
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index += 1
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# 按照n行打印出来
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def print_num_delta(n):
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# 计算需要生成多少个数字
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fbb_number_num = sum(range(1, n + 1))
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# 生成数字并保存
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fbb_list = list(fbb_arr(fbb_number_num))
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# 数字下标，用于遍历中保存位置
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start_index = 0
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# 每一行的数字数量
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for number_num in range(1, n + 1):
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# 切片用空格分隔后转成字符串
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nums = ' '.join(str(item) for item in fbb_list[start_index: start_index + number_num])
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# 格式化打印
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print(format(nums, r' ^{}'.format(len(str(fbb_list[-1])) * n)))
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# 更新下一行的数字下标
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start_index = start_index + number_num
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print_num_delta(5)
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# 生成器里为什么没有return: 如果一个函数里包含yield语句，那就会被识别为生成器函数，
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# 函数里的return此时自动失效被替换成生成器
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# 生成器函数在识别到return时，意识到生成结束，返回的StopIteration，交给for识别
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