Two ways to get the index and the value from List in Python

There are two ways to get both the index and the value from the List.
One is :

    for index, item in enumerate(L):
      print index, item

The other is:

    for index in range(len(L)):
      print index, L[index]

Still need to work hard on research. Seems the proof is wrong.

The index method does a linear search, and stops at the first matching item. If no matching item is found, it raises a ValueError exception.

try:
i = L.index(value)
except ValueError:
i = -1 # no match

To get the index for all matching items, you can use a loop, and pass in a start index:

i = -1
try:
while 1:
i = L.index(value, i+1)
print "match at", i
except ValueError:
pass