Why this is happening? I don’t really understand: >>> P = [ [()]*3 ]*3 >>> P [[(), (), ()], [(), (), ()], [(), (), ()]] >>> P[0][0]=1 >>> P [[1, (), ()], [1, (), ()], [1, (), ()]] Answers: Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may … Read more
Is there a built-in/quick way to use a list of keys to a dictionary to get a list of corresponding items?
I’m trying to understand the following piece of code: # node list n = [] for i in xrange(1, numnodes + 1): tmp = session.newobject(); n.append(tmp) link(n[0], n[-1]) Specifically, I don’t understand what the index -1 refers to. If the index 0 refers to the first element, then what does -1 refer to? Answers: Thank … Read more
How do I get the number of elements in the list items?
“Write a recursive function, “listSum” that takes a list of integers and returns the sum of all integers in the list”.
I am trying to take one string, and append it to every string contained in a list, and then have a new list with the completed strings. Example:
I was wondering why list comprehension is so much faster than appending to a list. I thought the difference is just expressive, but it’s not.
My input is a list of lists. Some of them share common elements, eg.
I have checked all of the other questions with the same error yet found no helpful solution =/
I am playing with python and am able to get the intersection of two lists: