﻿ Python: Extract every first or specified element from a given two-dimensional list - w3resource

# 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: ## Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:

Python Code Editor:

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﻿

## Python: Tips of the Day

Given a predicate function, fn, and a prop string, this curried function will then take an object to inspect by calling the property and passing it to the predicate:

Example:

```def tips_check_prop(fn, prop):
return lambda obj: fn(obj[prop])
check_age = tips_check_prop(lambda x: x >= 25, 'age')
user = {'name': 'Owen', 'age': 25}

print(check_age(user))
```

Output:

```True
```

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