python 查找算法
时间: 2023-10-17 10:31:52 浏览: 49
Python的查找算法包括二分查找算法和线性查找算法。
二分查找算法是一种高效的查找算法,它的前提条件是数据必须有序。该算法通过将当前列表不断分成两部分,然后跟踪最低和最高的两个索引,直到找到目标值为止。二分查找算法的Python代码如下:
```python
def binary_search(list, item):
first = 0
last = len(list) - 1
found = False
while first <= last and not found:
midpoint = (first + last) // 2
if list[midpoint == item:
found = True
else:
if item < list[midpoint]:
last = midpoint - 1
else:
first = midpoint + 1
return found
```
线性查找算法是一种简单直接的查找算法,它逐个匹配数据元素,直到找到目标值或遍历完整个列表。线性查找算法的Python代码如下:
```python
def linear_search(list, item):
index = 0
found = False
while index < len(list) and not found:
if list[index == item:
found = True
else:
index += 1
return found
```
这两种算法都可以用于在列表中查找特定的元素,但二分查找算法在有序数据上的查找效率更高。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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