#this is really basic, but it'll do
Array = [1,2,3,4,5,6,7,8] #example array
def LinearSearch(Array, SearchVal): #SearchVal= value you are looking for
for i in range(len(Array)):
if Array[i]== SearchVal:
return True
return False
#once it has looped through all of the array and hasn't found
#the search value, it will return False.