Top "Defaultdict" questions

A subclass of Python's dict class that allows to specify a default factory to use for missing keys.

How to initialize defaultdict with keys?

I have a dictionary of lists, and it should be initialized with default keys. I guess, the code below is …

python defaultdict python-collections
How to check for a key in a defaultdict without updating the dictionary (Python)?

I usually use the following idiom when working with a Python dictionary: try: val = dct[key] except KeyError: print key, " …

python dictionary defaultdict
Is there a clever way to pass the key to defaultdict's default_factory?

A class has a constructor which takes one parameter: class C(object): def __init__(self, v): self.v = v ... Somewhere …

python dictionary defaultdict
Can't pickle defaultdict

I have a defaultdict that looks like this: dict1 = defaultdict(lambda: defaultdict(int)) The problem is, I can't pickle it …

python pickle defaultdict
One-step initialization of defaultdict that appends to list?

It would be convenient if a defaultdict could be initialized along the following lines d = defaultdict(list, (('a', 1), ('b', 2), ('c', 3), (…

python defaultdict
Create and lookup 2D dictionary with multiple keys per value

I think I want to make a 2D dictionary with multiple keys per value. I know how to make a 2…

python dictionary nested key defaultdict
How to print defaultdict variable without its type?

In the following code: from collections import defaultdict confusion_proba_dict = defaultdict(float) for i in xrange(10): confusion_proba_dict[…

python dictionary defaultdict
nltk.word_tokenize() giving AttributeError: 'module' object has no attribute 'defaultdict'

I am new to nltk. I was trying some basics. import nltk nltk.word_tokenize("Tokenize me") gives me this …

nltk attributeerror defaultdict
sorting lists in python 3

So, I need to sort this kind of list with some random data in it by first element of second …

python list defaultdict
Creating a defaultdict with empty numpy array

I'm wondering if there's a more clever way to create a default dict from collections. The dict should have an …

python numpy collections defaultdict