Defaultdict And Counter
python
defaultdict
counter
dictionary
efficient-usage
programming
data-structures
This text provides an explanation on utilizing Python’s `defaultdict` and `Counter` for efficient dictionary usage. It demonstrates how to set a default value if a key is not found, count the occurrences of items in a collection, initialize and update `defaultdict`, making it convenient for managing such tasks efficiently.
from collections import defaultdict, Counter
mydict = defaultdict(Counter) # remember to put callable or none as argument of defaultdict
mydict = defaultdict(lambda: defaultdict(lambda: 0)) # alternative
mydict['k1']['k2'] += 1 # two is ok, but not one or three