How to override the hash function for integers in python? Question: I’d like to know if there is a way to override the hash function that are already defined for builtin types like int. In python the hash of an int gives his own value and i’d like to avoid that in my project. The …
concatenate key value pairs from python dictionary Question: I have a dictionary in python. The keys and the values are both strings. In fact the keys are some kind of flag (like -f) and the values are the options (e.g. an int like 20). What I want to do is to create a string with …
Most efficient way to check if a group is a subgroup of other group using any data structure on Python 3 Question: If I can choose between list of objects, lists of integers and dictionaries (is there any other data structure option?), which is the most efficient data structure to discover if a group is …
Why are tuples constructed from differently initialized sets equal? Question: I expected the following two tuples >>> x = tuple(set([1, “a”, “b”, “c”, “z”, “f”])) >>> y = tuple(set([“a”, “b”, “c”, “z”, “f”, 1])) to compare unequal, but they don’t: >>> x == y >>> True Why is that? Asked By: Ashish Anand || Source …
Improving performance of very large dictionary in Python Question: I find that if I initialize an empty dictionary at the beginning, and then adding elements to the dictionary in a for loop (about 110,000 keys, the value for each key is a list, also increasing in the loop), the speed goes down as for loop …
What's a correct and good way to implement __hash__()? Question: What’s a correct and good way to implement __hash__()? I am talking about the function that returns a hashcode that is then used to insert objects into hashtables aka dictionaries. As __hash__() returns an integer and is used for “binning” objects into hashtables I assume …
What is the true difference between a dictionary and a hash table? Question: I’ve always used dictionaries. I write in Python. Asked By: TIMEX || Source Answers: A Python dictionary is internally implemented with a hashtable. Answered By: Nicolás A dictionary is a data structure that maps keys to values. A hash table is a …
Map list onto dictionary Question: Is there a way to map a list onto a dictionary? What I want to do is give it a function that will return the name of a key, and the value will be the original value. For example; somefunction(lambda a: a[0], [“hello”, “world”]) => {“h”:”hello”, “w”:”world”} (This isn’t a …
Is a Python dictionary an example of a hash table? Question: One of the basic data structures in Python is the dictionary, which allows one to record “keys” for looking up “values” of any type. Is this implemented internally as a hash table? If not, what is it? Asked By: Tommy Herbert || Source Answers: …
