Python: Find numbers that are adjacent to a prime number in the list, sorted without duplicates
Python Programming Puzzles: Exercise-60 with Solution
Prime number: A number that is divisible only by itself and 1 (e.g. 2, 3, 5, 7, 11).
Write a Python program to find a list of all numbers that are adjacent to a prime number in the list, sorted without duplicates.
Input: [2, 17, 16, 0, 6, 4, 5] Output: [2, 4, 6, 16, 17] Input: [1, 2, 19, 16, 6, 4, 10] Output: [1, 2, 16, 19] Input: [1, 2, 3, 5, 1, 16, 7, 11, 4] Output: [1, 2, 3, 4, 5, 7, 11, 16]
Pictorial Presentation:
Sample Solution:
Python Code:
#License: https://bit.ly/3oLErEI
def test(nums):
return sorted({
n for i, n in enumerate(nums)
if (i > 0 and prime(nums[i - 1])) or (i < len(nums) - 1 and prime(nums[i + 1]))
})
def prime(m):
if (m>0):
return all(m % i for i in range(2, m - 1))
nums = [2, 17, 16, 0, 6, 4, 5]
print("Original list of numbers:")
print(nums)
print("Numbers that are adjacent to a prime number in the said list, sorted without duplicates:")
print(test(nums))
nums = [1, 2, 19, 16, 6, 4, 10]
print("\nOriginal list of numbers:")
print(nums)
print("Numbers that are adjacent to a prime number in the said list, sorted without duplicates:")
print(test(nums))
nums = [1, 2, 3, 5, 1, 16, 7, 11, 4]
print("\nOriginal list of numbers:")
print(nums)
print("Numbers that are adjacent to a prime number in the said list, sorted without duplicates:")
print(test(nums))
Sample Output:
Original list of numbers: [2, 17, 16, 0, 6, 4, 5] Numbers that are adjacent to a prime number in the said list, sorted without duplicates: [2, 4, 16, 17] Original list of numbers: [1, 2, 19, 16, 6, 4, 10] Numbers that are adjacent to a prime number in the said list, sorted without duplicates: [1, 2, 16, 19] Original list of numbers: [1, 2, 3, 5, 1, 16, 7, 11, 4] Numbers that are adjacent to a prime number in the said list, sorted without duplicates: [1, 2, 3, 4, 5, 7, 11, 16]
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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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