Python: Insert an element in a given list after every nth position
Python List: Exercise - 170 with Solution
Write a Python program to insert an element in a given list after every nth position.
Sample Solution:
Python Code:
def insert_elemnt_nth(lst, ele, n):
result = []
for st_idx in range(0, len(lst), n):
result.extend(lst[st_idx:st_idx+n])
result.append(ele)
result.pop()
return result
nums = [1,2,3,4,5,6,7,8,9,0]
print("Original list:")
print(nums)
i_ele = 'a'
i_ele_pos = 2
print("\nInsert",i_ele,"in the said list after",i_ele_pos,"nd element:")
print(insert_elemnt_nth(nums, i_ele, i_ele_pos))
i_ele = 'b'
i_ele_pos = 4
print("\nInsert",i_ele,"in the said list after",i_ele_pos,"th element:")
print(insert_elemnt_nth(nums, i_ele, i_ele_pos))
Sample Output:
Original list: [1, 2, 3, 4, 5, 6, 7, 8, 9, 0] Insert a in the said list after 2 nd element: [1, 2, 'a', 3, 4, 'a', 5, 6, 'a', 7, 8, 'a', 9, 0] Insert b in the said list after 4 th element: [1, 2, 3, 4, 'b', 5, 6, 7, 8, 'b', 9, 0]
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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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