get index of second occurrence python code example

Example 1: python return first list element that contains substring

# Example usage:
your_list = ['The answer to', 'the ultimate question', 'of life', 
     'the universe', 'and everything', 'is 42']

[idx for idx, elem in enumerate(your_list) if 'universe' in elem][0]
--> 3 # The 0-based index of the first list element containing "universe"

Example 2: python return index of second match

# Basic syntax using list comprehension:
[i for i, n in enumerate(your_list) if n == condition][match_number]
# Where:
#	- This setup makes a list of the indexes for list items that meet
#		the condition and then match_number returns the nth index
#	- enumerate() returns iterates through your_list and returns each
#		element (n) and index value (i)

# Example usage:
your_list = ['w', 'e', 's', 's', 's', 'z','z', 's']
[i for i, n in enumerate(your_list) if n == 's'][0]
--> 2
# 2 is returned because it is the index of the first element that
#	meets the condition (being 's')