Python Search Algorithms - Linear Search

In this tutorial I teach you about the first of many searching algorithms called the 'Linear Search'. Next video will be on the 'Binary Search'
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[DKCgame]

lst = [1, 100, 3, 10, -5, 7, 9]
def linser():
choice=int(input("Enter number, that you would like me to find."))
found=False
attempts=0
while (attempts < len(lst)) and (found==False):
if lst[attempts] == choice:
found = True
print("In list.")
attempts += 1
if found == False:
print("Not in list")
linser()

this does not work properly for some reason, print not found every time