Python: list: index: Get index of element

list.index(x)

‘list’ provides index method, which returns the index of the first item whose value is x.

test.py

list=[2, 4, 6, 6, 4, 2]
print(list)

print("index of 2 is ", list.index(2))
print("index of 4 is ", list.index(4))
print("index of 6 is ", list.index(6))

$ python3 test.py

[2, 4, 6, 6, 4, 2]

index of 2 is  0

index of 4 is  1

index of 6 is  2

Throws an error, if element is not in the list.

test.py

list=[2, 4, 6, 6, 4, 2]
print(list)

print("index of 20 is ", list.index(20))

$ python3 test.py

[2, 4, 6, 6, 4, 2]

Traceback (most recent call last):

  File "test.py", line 4, in <module>

    print("index of 20 is ", list.index(20))

ValueError: 20 is not in list

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