Python: Insert a specified element in a given list after every nth element
Python List: Exercise - 178 with Solution
Write a Python program to insert a specified element in a given list after every nth element.
Sample Solution:
Python Code:
def inset_element_list(lst, x, n):
i = n
while i < len(lst):
lst.insert(i, x)
i+= n+1
return lst
nums = [1, 3, 5, 7, 9, 11,0, 2, 4, 6, 8, 10,8,9,0,4,3,0]
print("Original list:")
print(nums)
x = 20
n = 4
print("\nInsert",x,"in said list after every",n,"th element:")
print(inset_element_list(nums, x, n))
chars = ['s','d','f','j','s','a','j','d','f','d']
print("\nOriginal list:")
print(chars)
x = 'Z'
n = 3
print("\nInsert",x,"in said list after every",n,"th element:")
print(inset_element_list(chars, x, n))
Sample Output:
Original list: [1, 3, 5, 7, 9, 11, 0, 2, 4, 6, 8, 10, 8, 9, 0, 4, 3, 0] Insert 20 in said list after every 4 th element: [1, 3, 5, 7, 20, 9, 11, 0, 2, 20, 4, 6, 8, 10, 20, 8, 9, 0, 4, 20, 3, 0] Original list: ['s', 'd', 'f', 'j', 's', 'a', 'j', 'd', 'f', 'd'] Insert Z in said list after every 3 th element: ['s', 'd', 'f', 'Z', 'j', 's', 'a', 'Z', 'j', 'd', 'f', 'Z', 'd']
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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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