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Python: Extract every first or specified element from a given two-dimensional list

Python List: Exercise - 144 with Solution

Write a Python program to extract every first or specified element from a given two-dimensional list.

Sample Solution:

Python Code:

def specified_element(nums, N):
    result = [i[N] for i in nums]
    return result
    
nums = [
        [1,2,3,2],
        [4,5,6,2],
        [7,1,9,5],
       ]
    
print("Original list of lists:")
print(nums)
N = 0
print("\nExtract every first element from the said given two dimensional list:")
print(specified_element(nums, N))
N = 2
print("\nExtract every third element from the said given two dimensional list:")
print(specified_element(nums, N))

Sample Output:

Original list of lists:
[[1, 2, 3, 2], [4, 5, 6, 2], [7, 1, 9, 5]]

Extract every first element from the said given two dimensional list:
[1, 4, 7]

Extract every third element from the said given two dimensional list:
[3, 6, 9]

Flowchart:

Flowchart: Extract every first or specified element from a given two-dimensional list.

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Python Code Editor:

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Previous: Write a Python program to get the frequency of the elements in a given list of lists.
Next: Write a Python program to generate a number in a specified range except some specific numbers.

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Python: Tips of the Day

Floor Division:

When we speak of division we normally mean (/) float division operator, this will give a precise result in float format with decimals.

For a rounded integer result there is (//) floor division operator in Python. Floor division will only give integer results that are round numbers.

print(1000 // 300)
print(1000 / 300)

Output:

3
3.3333333333333335