Write a Python function to multiply all the positive numbers in a list. The function should return that result.

Write a python function that transforms all the positive numbers from a list and returns back True if it performed any action on the list and False otherwise.

Write a function that returns True if its argument is a palindrome and False otherwise. A palindrome is a word, number, phrase, or other sequence of characters which reads the same way backward as forward (e.g., madam, able was i ere i saw Elba, 10101, 90.09).

• Make a function from your implementation that, given a sequence, it returns a set with the unique substrings.
• Make k as a default argument to the function.
• Add a docstring to the function.

a dictionary in the implementation with substring counts.

• Use the substrings as dictionary keys.
• Use the counts as dictionary values.
• Have the function return the dictionary.
• Add a docstring to the function.