Write a generator function merge that takes in two infinite generators a and b that are in increasing order without duplicates and returns a generator that has all the elements of both generators, in increasing order, without duplicates.
时间: 2024-02-25 13:55:55 浏览: 52
Sure! Here's an implementation of the `merge` generator function:
```python
def merge(a, b):
ia, ib = iter(a), iter(b)
va, vb = next(ia), next(ib)
while True:
if va < vb:
yield va
va = next(ia)
elif vb < va:
yield vb
vb = next(ib)
else:
yield va
va, vb = next(ia), next(ib)
```
This generator function takes two infinite generators `a` and `b` that are in increasing order without duplicates, and returns a generator that has all the elements of both generators, also in increasing order without duplicates.
The function first initializes two iterators `ia` and `ib` for the generators `a` and `b`, respectively. It then initializes the variables `va` and `vb` with the first elements of `a` and `b`, respectively.
The function then enters an infinite loop that repeatedly compares the values of `va` and `vb` and yields the smaller value. If `va` is smaller than `vb`, the function yields `va` and advances the `ia` iterator to the next element of `a`. If `vb` is smaller than `va`, the function yields `vb` and advances the `ib` iterator to the next element of `b`. If `va` and `vb` are equal, the function yields `va` (since we want to remove duplicates) and advances both the `ia` and `ib` iterators to the next elements of `a` and `b`, respectively.
Here's an example usage of this generator function:
```python
>>> def gen1():
... i = 0
... while True:
... yield i
... i += 2
...
>>> def gen2():
... i = 1
... while True:
... yield i
... i += 2
...
>>> merged = merge(gen1(), gen2())
>>> [next(merged) for _ in range(10)]
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
```
This example defines two infinite generators `gen1` and `gen2` that generate all even and odd numbers, respectively. The `merge` function is then used to merge these two generators into a single generator `merged` that generates all the numbers in increasing order, without duplicates. Finally, the list comprehension `[next(merged) for _ in range(10)]` is used to consume the first 10 elements of `merged` and return them as a list. The result is `[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]`, which shows that `merged` generates all the even and odd numbers up to 9 in increasing order without duplicates.
相关推荐
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)