You can use the index()
function to find the index of an item in a list:
l = ['pike', 'halibut', 'monkfish', 'goldfish'] print l.index('halibut')
If the item is not in the list, a ValueError
is raised, so you would need to check for this or handle it if you’re not sure.
if 'shark' in l: print l.index('shark') else: print 'Not there.'
Or:
try: print l.index('shark') except ValueError: print 'Not there.'