Q:

Python program to extract rear element from list of tuples record

mahmoud2506
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2022-05-23
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Example:

tuple = ("python", "includehelp", 43, 54.23)

Extracting rear elements from list of tuples record

We have a list of tuples where each tuple contains some elements. We need to create a Python program to extract the last element of each tuple of the list.

Input:
[(1, 'python', 1991), (2, 'java', 1995), (3, 'C', 1972)]

Output:
1991, 1995, 1972

To find the solution to the problem, we will iterate over the array and then extract the last element of each tuple.

In Python, we can perform the task in multiple ways using one of the multiple methods that are present in the function.

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mahmoud2506
2022-05-23
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Method 1:

One method to solve the problem in Python is by using list comprehension using which we will iterate over the list and extract the value at index -1 for each tuple of the list and then print it.

# Python program to extract rear elements 
# from list of tuples record
  
# initializing and printing list of Tuples
tupList = [(1, 'python', 1991), (2, 'java', 1995), (3, 'C', 1972)]

print ("The elements of list of tuples are " + str(tupList))
  
# extracting rear elements from the list of tuples
rearElementList = [tup[-1] for tup in tupList]
      
# printing result
print ("All rear elements of list of tuples are " + str(rearElementList))

Output:

The elements of list of tuples are [(1, 'python', 1991), (2, 'java', 1995), (3, 'C', 1972)]
All rear elements of list of tuples are [1991, 1995, 1972]

Method 2:

Another method to solve the problem is by using the map() method. And map all the last values of each tuple list which are extracted using the itemgetter() method.

# Python program to extract rear elements 
# from list of tuples record
  
# initializing and printing list of Tuples
tupList = [(1, 'python', 1991), (2, 'java', 1995), (3, 'C', 1972)]

print ("The elements of list of tuples are " + str(tupList))
  
# extracting rear elements from the list of tuples
rearElementList = [tup[-1] for tup in tupList]
      
# printing result
print ("All rear elements of list of tuples are " + str(rearElementList))

Output:

The elements of list of tuples are [(1, 'python', 1991), (2, 'java', 1995), (3, 'C', 1972)]
All rear elements of list of tuples are [1991, 1995, 1972]

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