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# Python program to implement Linear Search Algorithm

Hello everyone, welcome back to Programming In Python! Here I am going to explain to you how to implement a linear search algorithm in Python. This linear search is a basic search algorithm that searches all the elements in the list and finds the required value. This is also known as a sequential search.

Here in this technique, I compare each and every element with the key element to be found, if both of them match, the algorithm returns that element is found and its position.

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#### Time Complexity

 Best Case O(1) Average Case O(n) Worst Case O(n)

#### Algorithm

Given a list `L` of `n` elements with values or records,`L0 ... Ln-1` and key/target element `K`, linear search is used to find the index/position of the target `K` in list `L`

1. Initialize a boolean variable `found` and set it to False initially
2. Start for loop with `i` ranging from 0 to the length of the list
3. Check if key element is equal to `L[i]`
1. if equals
1. set `found` boolean variable to `True`
2. print the position of the element found
3. break for loop
4. If the boolean variable `found` is equal to `False` after for loop, print that the element is not found in the list

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#### Program

```__author__ = 'Avinash'

lst = []
num = int(input("Enter size of list: \t"))
for n in range(num):
numbers = int(input("Enter any number: \t"))
lst.append(numbers)

x = int(input("\nEnter number to search: \t"))

found = False

for i in range(len(lst)):
if lst[i] == x:
found = True
print("\n%d found at position %d" % (x, i))
break