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Python List Methods

• Python List index()
• Python List append()
• Python List extend()
• Python List insert()
• Python List remove()
• Python List count()
• Python List pop()
• Python List reverse()
• Python List sort()
• Python List copy()
• Python List clear()

Python Tutorials

• Python Tuple index()
• Python String index()
• Python List insert()
• Python List pop()
• Python List
• Python String rindex()

Python List index()

The index() method returns the index of the specified element in the list.

Example

animals = ['cat', 'dog', 'rabbit', 'horse'] # get the index of 'dog' index = animals.index('dog') print(index) # Output: 1

Syntax of List index()

The syntax of the list index() method is:

list.index(element, start, end)

list index() parameters

The list index() method can take a maximum of three arguments:

• element - the element to be searched
• start (optional) - start searching from this index
• end (optional) - search the element up to this index

Return Value from List index()

• The index() method returns the index of the given element in the list.
• If the element is not found, a ValueError exception is raised.

Note: The index() method only returns the first occurrence of the matching element.

Example 1: Find the index of the element

# vowels list vowels = ['a', 'e', 'i', 'o', 'i', 'u'] # index of 'e' in vowels index = vowels.index('e') print('The index of e:', index) # element 'i' is searched # index of the first 'i' is returned index = vowels.index('i') print('The index of i:', index)

Output

The index of e: 1 The index of i: 2

Example 2: Index of the Element not Present in the List

# vowels list vowels = ['a', 'e', 'i', 'o', 'u'] # index of 'p' is vowels index = vowels.index('p') print('The index of p:', index)

Output

ValueError: 'p' is not in list

Example 3: Working of index() With Start and End Parameters

# alphabets list alphabets = ['a', 'e', 'i', 'o', 'g', 'l', 'i', 'u'] # index of 'i' in alphabets index = alphabets.index('e') # 1 print('The index of e:', index) # 'i' after the 4th index is searched index = alphabets.index('i', 4) # 6 print('The index of i:', index) # 'i' between 3rd and 5th index is searched index = alphabets.index('i', 3, 5) # Error! print('The index of i:', index)

Output

The index of e: 1 The index of i: 6 Traceback (most recent call last): File "*lt;string>", line 13, in ValueError: 'i' is not in list

Also Read: Python Program to Access Index of a List Using for Loop

Before we wrap up, let’s put your knowledge of Python list index() to the test! Can you solve the following challenge?

Challenge:

Write a function to find the index of a given element in a list.

• For example, with inputs [1, 2, 3, 4, 5] and 3, the output should be 2.

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