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Python: Get a list with n elements removed from the left, right

Python List: Exercise - 268 with Solution

Write a Python program to get a list with n elements removed from the left and right.

Removed from the left:

  • Use slice notation to remove the specified number of elements from the left.
  • Omit the last argument, n, to use a default value of 1.

Removed from the right:

Returns a list with n elements removed from the right.

  • Use slice notation to remove the specified number of elements from the right.
  • Omit the last argument, n, to use a default value of 1.

Sample Solution:

Python Code:

def drop_left_right(a, n = 1):
  return a[n:], a[:-n] 
nums = [1, 2, 3]
print("Original list elements:")
print(nums)
result = drop_left_right(nums)
print("Remove 1 element from left of the said list:")
print(result[0])
print("Remove 1 element from right of the said list:")
print(result[1])
nums = [1, 2, 3, 4]
print("\nOriginal list elements:")
print(nums)
result = drop_left_right(nums,2)
print("Remove 2 elements from left of the said list:")
print(result[0])
print("Remove 2 elements from right of the said list:")
print(result[1])
nums = [1, 2, 3, 4, 5, 6]
print("\nOriginal list elements:")
print(nums)
result = drop_left_right(nums)
print("Remove 7 elements from left of the said list:")
print(result[0])
print("Remove 7 elements from right of the said list:")
print(result[1])

Sample Output:

Original list elements:
[1, 2, 3]
Remove 1 element from left of the said list:
[2, 3]
Remove 1 element from right of the said list:
[1, 2]

Original list elements:
[1, 2, 3, 4]
Remove 2 elements from left of the said list:
[3, 4]
Remove 2 elements from right of the said list:
[1, 2]

Original list elements:
[1, 2, 3, 4, 5, 6]
Remove 7 elements from left of the said list:
[2, 3, 4, 5, 6]
Remove 7 elements from right of the said list:
[1, 2, 3, 4, 5]

Flowchart:

Flowchart: Get a list with n elements removed from the left, right.

Visualize Python code execution:

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Python Code Editor:

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Previous: Write a Python program to get the cumulative sum of the elements of a given list.
Next: Write a Python program to get the every nth element in a given list.

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Python: Tips of the Day

Returns True if the provided function returns True for every element in the list, False otherwise:

Example:

def tips_every(lst, fn=lambda x: x):
  return all(map(fn, lst))

print(tips_every([2, 4, 3], lambda x: x > 1))
print(tips_every([1, 2, 3]))

Output:

True
True