Linear Search

Array=['john','jack','jill']

# Flag to check if search found the value. Set to False by default
checked = False

#function to check through the array
def array_check(Userinput):
    position=0
    global checked
    #global is needed to use a variable outside of the function
    while position<len(Array):
        if Userinput == Array[position]:
            print('Found it')
            checked = True

        position=position+1

# This is the second While loop. Using a function makes this much more elegant
while checked == False :
    Userinput = input('Type the item for search:')
    array_check(Userinput)
    print(checked)