Python program to create a list of tuples from given list having number and its cube in each tuple
Given a list of numbers of list, write a Python program to create a list of tuples having first element as the number and second element as the cube of the number. Example:
Input: list = [1, 2, 3] Output: [(1, 1), (2, 8), (3, 27)] Input: list = [9, 5, 6] Output: [(9, 729), (5, 125), (6, 216)]
Method #1 : Using pow() function.We can use list comprehension to create a list of tuples. The first element will be simply an element and second element will be cube of that number. Below is the Python implementation:
Python3
# Python program to create a list of tuples # from given list having number and # its cube in each tuple # creating a list list1 = [ 1 , 2 , 5 , 6 ] # using list comprehension to iterate each # values in list and create a tuple as specified res = [(val, pow (val, 3 )) for val in list1] # print the result print (res) |
Output:
[(1, 1), (2, 8), (5, 125), (6, 216)]
Method #2: Using ** operator
Python3
# Python program to create a list of tuples # from given list having number and # its cube in each tuple # creating a list list1 = [ 1 , 2 , 5 , 6 ] # using list comprehension to iterate each # values in list and create a tuple as specified res = [(val, val * * 3 ) for val in list1] # print the result print (res) |
[(1, 1), (2, 8), (5, 125), (6, 216)]
Method #3: Using map() and lambda function
We can also use the map() function along with a lambda function to create a list of tuples. The lambda function will take an element from the list as input and return a tuple containing the element and its cube as output. The map() function will apply this lambda function to all elements in the list and return a list of tuples.
Here is the Python implementation of this approach:
Python3
list1 = [ 1 , 2 , 5 , 6 ] res = list ( map ( lambda x: (x, x * * 3 ), list1)) print (res) #This code is contributed by Edula Vinay Kumar Reddy |
[(1, 1), (2, 8), (5, 125), (6, 216)]
Time complexity: O(n), where n is the length of the input list.
Auxiliary space: O(n), since a new list of tuples is created with the same size as the input list.
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