Python: Check the length and the fifth element occurs twice in a list

Last update on May 28 2022 13:41:28 (UTC/GMT +8 hours)

Python Programming Puzzles: Exercise-2 with Solution

Write a Python program that accept a list of integers and check the length and the fifth element. Return true if the length of the list is 8 and fifth element occurs thrice in the said list.

Input:
[19, 19, 15, 5, 5, 5, 1, 2]
Output:
True

Input:
[19, 15, 5, 7, 5, 5, 2]
Output:
False

Input:
[11, 12, 14, 13, 14, 13, 15, 14]
Output:
True

Input:
[19, 15, 11, 7, 5, 6, 2]
Output:
False

Pictorial Presentation:

Python: Check the length and the fifth element occurs twice in a list.

Sample Solution:

Python Code:

#License: https://bit.ly/3oLErEI

def test(nums):
    return len(nums) == 8 and nums.count(nums[4]) == 3

nums = [19,19,15,5,5,5,1,2]
print("Original list:")
print(nums)
print("Check whether the length of the said list is 8 and fifth element occurs thrice in the said list. :")
print(test(nums))
nums = [19,15,5,7,5,5,2]
print("\nOriginal list:")
print(nums)
print("Check whether the length of the said list is 8 and fifth element occurs thrice in the said list. :")
print(test(nums))
nums = [11,12,14,13,14,13,15,14]
print("\nOriginal list:")
print(nums)
print("Check whether the length of the said list is 8 and fifth element occurs thrice in the said list. :")
print(test(nums))
nums = [19,15,11,7,5,6,2]
print("\nOriginal list:")
print(nums)
print("Check whether the length of the said list is 8 and fifth element occurs thrice in the said list. :")
print(test(nums))

Sample Output:

Original list:
[19, 19, 15, 5, 5, 5, 1, 2]
Check whether the length of the said list is 8 and fifth element occurs thrice in the said list. :
True

Original list:
[19, 15, 5, 7, 5, 5, 2]
Check whether the length of the said list is 8 and fifth element occurs thrice in the said list. :
False

Original list:
[11, 12, 14, 13, 14, 13, 15, 14]
Check whether the length of the said list is 8 and fifth element occurs thrice in the said list. :
True

Original list:
[19, 15, 11, 7, 5, 6, 2]
Check whether the length of the said list is 8 and fifth element occurs thrice in the said list. :
False

Flowchart:

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Previous: List of integers with exactly two occurrences of nineteen and at least three occurrences of five.
Next: Whether an integer greater than 4^4 which is 4 mod 34.

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