Python: Remove a specified column from a given nested list
Python List: Exercise - 107 with Solution
Write a Python program to remove a specified column from a given nested list.
Sample Solution:
Python Code:
def remove_column(nums, n):
for i in nums:
del i[n]
return nums
list1 = [[1, 2, 3], [2, 4, 5], [1, 1, 1]]
n = 0
print("Original Nested list:")
print(list1)
print("After removing 1st column:")
print(remove_column(list1, n))
list2 = [[1, 2, 3], [-2, 4, -5], [1, -1, 1]]
n = 2
print("\nOriginal Nested list:")
print(list2)
print("After removing 3rd column:")
print(remove_column(list2, n))
Sample Output:
Original Nested list: [[1, 2, 3], [2, 4, 5], [1, 1, 1]] After removing 1st column: [[2, 3], [4, 5], [1, 1]] Original Nested list: [[1, 2, 3], [-2, 4, -5], [1, -1, 1]] After removing 3rd column: [[1, 2], [-2, 4], [1, -1]]
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Python: Tips of the Day
Find current directory and file's directory:
To get the full path to the directory a Python file is contained in, write this in that file:
import os dir_path = os.path.dirname(os.path.realpath(__file__))
(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)
To get the current working directory use
import os cwd = os.getcwd()
Documentation references for the modules, constants and functions used above:
- The os and os.path modules.
- The __file__ constant
- os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
- os.path.dirname(path) (returns "the directory name of pathname path")
- os.getcwd() (returns "a string representing the current working directory")
- os.chdir(path) ("change the current working directory to path")
Ref: https://bit.ly/3fy0R6m
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