Update linear_search.py

codes/python/chapter_searching/linear_search.py

@@ -1,10 +1,38 @@
 '''
 File: linear_search.py
-Created Time: 2022-11-25
-Author: Krahets (krahets@163.com)
+Created Time: 2022-11-26
+Author: timi (xisunyy@163.com)
 '''
 
 import sys, os.path as osp
 sys.path.append(osp.dirname(osp.dirname(osp.abspath(__file__))))
 from include import *
 
+""" 线性查找（数组） """
+def linear_search(nums,target):
+    # 遍历数组
+    for i in range(len(nums)):
+        if nums[i]==target: # 找到目标元素，返回其索引
+            return i
+    return -1               # 未找到目标元素，返回 -1
+
+""" 线性查找（链表） """
+def linear_search_by_link(head,target):
+    # 遍历链表
+    while head:
+        if head.val==target:    # 找到目标结点，返回之
+            return  head
+        head=head.next
+    return None         # 未找到目标结点，返回 None (Python为None)
+
+if __name__=='__main__':
+    target=3
+    # 在数组中执行线性查找
+    nums=[1, 5, 3, 2, 4, 7, 5, 9, 10, 8]
+    index=linear_search(nums,target)
+    print("目标元素 3 的索引 = " ,index)
+
+    # 在链表中执行线性查找
+    head=list_to_linked_list(nums)
+    node=linear_search_by_link(head,target)
+    print("目标结点值 3 的对应结点对象为 " ,node)