How does collections.defaultdict work?
I’ve read the examples in python docs, but still can’t figure out what this method means. Can somebody help? Here are two examples from the python docs
default-value
Python argparse: default value or specified value
I would like to have a optional argument that will default to a value if only the flag is present with no value specified, but store a user-specified value instead of the default if the user specifies a value. Is there already an action available for this?
Python constructor and default value
Somehow, in the Node class below, the wordList and adjacencyList variable is shared between all instances of Node. >>> class Node: … def __init__(self, wordList = [], adjacencyList = []): … self.wordList = wordList … self.adjacencyList = adjacencyList … >>> a = Node() >>> b = Node() >>> a.wordList.append("hahaha") >>> b.wordList ['hahaha'] >>> b.adjacencyList.append("hoho") >>> … Read more
Difference between mutation, rebinding, copying value, and assignment operator
I found this nice tutorial on the topic.
Named tuple and default values for optional keyword arguments
I’m trying to convert a longish hollow “data” class into a named tuple. My class currently looks like this:
Getting a default value on index out of range in Python
a=['123','2',4] b=a[4] or 'sss' print b I want to get a default value when the list index is out of range (here: ‘sss’). How can I do this? Answers: Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat … Read more
What is the scope of a defaulted parameter in Python?
When you define a function in Python with an array parameter, what is the scope of that parameter?