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