Python 合并序列的生成器出现问题

我正在研究python中生成器的主题，无法处理一项任务

要点是：您需要实现一个生成器，它接受2个非递减序列，将其组合成1个非递减序列并返回它

我知道如何用函数编写它，但我不知道如何通过“yield”实现它

以下是我的函数代码：

def merge_lists(lst1, lst2):
    res = []
    i1, i2 = 0, 0
    while i1 < len(lst1) and i2 < len(lst2):
        el1, el2 = lst1[i1], lst2[i2]
        res.append(el1)
        i1 += 1
        res.append(el2)
        i2 += 1
    res.extend(lst1[i1:])
    res.extend(lst2[i2:])
    return res

def合并列表（lst1、lst2）：
res=[]
i1，i2=0，0
当i1

我很乐意在编写代码和解释解决方案方面得到帮助

import itertools
itertools.chain.from_iterable([range(10), range(20, 30)])
# Should get your work done. 
# Or, in your case
itertools.chain.from_iterable([lst1, lst2])

---

请访问以获取更多有用的生成器。

代码/算法：

def merge_lists(lst1, lst2):
    i = j = 0
    while i < len(lst1) and j < len(lst2):
        if lst1[i] <= lst2[j]:
            yield lst1[i]
            i += 1
        else:
            yield lst2[j]
            j += 1

    while i < len(lst1):
        yield lst1[i]
        i += 1

    while j < len(lst2):
        yield lst2[j]
        j += 1

lst1 = list(range(0, 10)) # lst1 is [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
lst2 = list(range(10, 21)) # lst2 is [10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20

for num in merge_lists(lst1, lst2): # -- loop through the generator
    print(num, end=" ") #--> use the results on demand

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 # --> combined non declining sequence

结果：

def merge_lists(lst1, lst2):
    i = j = 0
    while i < len(lst1) and j < len(lst2):
        if lst1[i] <= lst2[j]:
            yield lst1[i]
            i += 1
        else:
            yield lst2[j]
            j += 1

    while i < len(lst1):
        yield lst1[i]
        i += 1

    while j < len(lst2):
        yield lst2[j]
        j += 1

lst1 = list(range(0, 10)) # lst1 is [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
lst2 = list(range(10, 21)) # lst2 is [10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20

for num in merge_lists(lst1, lst2): # -- loop through the generator
    print(num, end=" ") #--> use the results on demand

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 # --> combined non declining sequence

a=[9,7,5,3]
b=[8,6,4,2]
def合并（l1、l2）：
i1=0
i2=0
而i1