Python: Inject a number in between each pair of adjacent numbers in a list of numbers
Python Programming Puzzles: Exercise-71 with Solution
Given a list of numbers and a number to inject, write a Python program to create a list containing that number in between each pair of adjacent numbers.
Input: [12, -7, 3, -89, 14, 88, -78, -1, 2, 7] Separator: 6 Output: [12, 6, -7, 6, 3, 6, -89, 6, 14, 6, 88, 6, -78, 6, -1, 6, 2, 6, 7] Input: [1, 2, 3, 4, 5, 6] Separator: 9 Output: [1, 9, 2, 9, 3, 9, 4, 9, 5, 9, 6]
Pictorial Presentation:
Sample Solution-1:
Python Code:
#License: https://bit.ly/3oLErEI
def test(nums, sep):
ans = [sep] * (2 * len(nums) - 1)
ans[::2] = nums
return ans
nums = [12, -7, 3, -89, 14, 88, -78, -1, 2, 7]
separator = 6
print("List of numbers:",nums)
print("Separator:",separator)
print("Inject the separator in between each pair of adjacent numbers of the said list:")
print(test(nums,separator))
nums = [1, 2, 3, 4, 5, 6]
separator = 9
print("\nList of numbers:",nums)
print("Separator:",separator)
print("Inject the separator in between each pair of adjacent numbers of the said list:")
print(test(nums,separator))
Sample Output:
List of numbers: [12, -7, 3, -89, 14, 88, -78, -1, 2, 7] Separator: 6 Inject the separator in between each pair of adjacent numbers of the said list: [12, 6, -7, 6, 3, 6, -89, 6, 14, 6, 88, 6, -78, 6, -1, 6, 2, 6, 7] List of numbers: [1, 2, 3, 4, 5, 6] Separator: 9 Inject the separator in between each pair of adjacent numbers of the said list: [1, 9, 2, 9, 3, 9, 4, 9, 5, 9, 6]
Flowchart:
Visualize Python code execution:
The following tool visualize what the computer is doing step-by-step as it executes the said program:
Sample Solution-2:
Python Code:
#License: https://bit.ly/3oLErEI
def test(nums, sep):
result = []
for i in range(len(nums)):
if i == len(nums) - 1:
result.append(nums[i])
else:
result.append(nums[i])
result.append(sep)
return result
nums = [12, -7, 3, -89, 14, 88, -78, -1, 2, 7]
separator = 6
print("List of numbers:",nums)
print("Separator:",separator)
print("Inject the separator in between each pair of adjacent numbers of the said list:")
print(test(nums,separator))
nums = [1, 2, 3, 4, 5, 6]
separator = 9
print("\nList of numbers:",nums)
print("Separator:",separator)
print("Inject the separator in between each pair of adjacent numbers of the said list:")
print(test(nums,separator))
Sample Output:
List of numbers: [12, -7, 3, -89, 14, 88, -78, -1, 2, 7] Separator: 6 Inject the separator in between each pair of adjacent numbers of the said list: [12, 6, -7, 6, 3, 6, -89, 6, 14, 6, 88, 6, -78, 6, -1, 6, 2, 6, 7] List of numbers: [1, 2, 3, 4, 5, 6] Separator: 9 Inject the separator in between each pair of adjacent numbers of the said list: [1, 9, 2, 9, 3, 9, 4, 9, 5, 9, 6]
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 :
Have another way to solve this solution? Contribute your code (and comments) through Disqus.
Previous: Find the first negative balance.
Next: Find the indices of three numbers that sum to 0 in a list.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
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
- New Content published on w3resource:
- HTML-CSS Practical: Exercises, Practice, Solution
- Java Regular Expression: Exercises, Practice, Solution
- Scala Programming Exercises, Practice, Solution
- Python Itertools exercises
- Python Numpy exercises
- Python GeoPy Package exercises
- Python Pandas exercises
- Python nltk exercises
- Python BeautifulSoup exercises
- Form Template
- Composer - PHP Package Manager
- PHPUnit - PHP Testing
- Laravel - PHP Framework
- Angular - JavaScript Framework
- Vue - JavaScript Framework
- Jest - JavaScript Testing Framework