Linear Search in Python

def linear_search(alist, num):
    for i, elem in enumerate(alist):
        if elem == num: 
            return i 

    return None  # If number doesn't exist in the list

>>> mylist = [1, 2, 3, 4, 5, 6, 7]
>>> num = 3  # number to be searched
>>> linear_search(mylist, num)
2
>>>

This code can be found on github [Python-DSA] repository.

If you find anything wrong or has a better solution, please feel free to create issues on this repo.