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#Get index of substring
my_str = "Hello World"
index_of_str = my_str.index("Wor")
print(index_of_str)
# -> 6
# Get index of an element in a list
my_list = ["James", "Rick", "Carol", "Carl"]
index_of_item = my_list.index("Carol")
print(index_of_item)
# -> 2Using above code examples, we are using index() function of Python String and Python List. The function is used to get the index of item in list or string.
The index function takes the value as a parameter that needs to be checked in an array or list and return the very first position index of it. For example if we have a string 'Hello' and we want to get the index of 'l' in this string then the 'Hello'.index('l') function will return 2.
Syntax of index() function
List.index(value, from_index, to_index)value: The value parameter is a required parameter in index() method. This is the value that needs to be checked in the list or string and the very first index is returned.
from_index: This is an optional parameter where we can pass from which index we want to start the search of given value.
to_index: This is also an optional parameter and this is the last index value where we want to end our search.
my_list = [5, 3, 1, 9, 6, 2, 4, 5, 9, 7]
result = my_list.index(5, 3, 10)
print(result)
# -> 7
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