memo = {} vs memo = dict()

• The choice between memo = {} and memo = dict() in Python can be seen as a matter of personal preference, as both achieve the same result. The {} syntax is a shorthand for creating an empty dictionary, while dict() is the explicit constructor for creating a dictionary. Both methods are commonly used, and the choice between them often comes down to readability and personal style.
• In terms of performance, there is no significant difference between the two methods for creating an empty dictionary. Both approaches result in the creation of an empty dictionary object, and the performance characteristics are essentially the same.
• Therefore, the decision between memo = {} and memo = dict() ultimately comes down to personal preference and coding style.

In Python, the {} syntax is used to create an empty dictionary, not a set. To create an empty set, the set() constructor should be used.

Use the curly braces {} or the set() function to create sets. For example:
python

my_set = {1, 2, 3}
another_set = set([4, 5, 6])