# set default values for all keys
d = collections.defaultdict(lambda:1)# set default value for a key if not exist - will not modify dictionary
value = d.get(key,default_value)# if key is in the dictionary: return value# else: insert the default value as well as return it
dict_trie.setdefault(char,{})
>>>from collections import defaultdict
>>> food_list ='spam spam spam spam spam spam eggs spam'.split()>>> food_count = defaultdict(int)# default value of int is 0>>>for food in food_list:... food_count[food]+=1# increment element's value by 1...
defaul
>>> s =[('yellow',1),('blue',2),('yellow',3),('blue',4),('red',1)]>>> d = defaultdict(list)>>>for k, v in s:... d[k].append(v)...>>> d.items()[('blue',[2,4]),('red',[1]),('yellow',[1,3])]
"""defaultdict allows us to initialize a dictionary that will assign a
default value to non-existent keys. By supplying the argument int,
we are able to ensure that any non-existent keys are automatically
assigned a default value of 0."""
# Python program to demonstrate# defaultdictfrom collections import defaultdict
# Function to return a default# values for keys that is not# presentdefdef_value():return"Not Present"# Defining the dict
d = defaultdict(def_value)
d["a"]=1
d["b"]=2print(d["a"])# 1print(d["b"])# 2print(d["c"])# Not Present
# sample code
monthConversions ={1:"January",2:"February",3:"March",4:"April",5:"May",6:"June",7:"July",8:"August",9:"September",10:"October",11:"November",12:"December"}
num_month =int(input("Enter number of month: "))# with default prompt if keys not found (keys,default value)print(monthConversions.get(num_month,"Invalid input"))>>Enter number of month:13>>Invalid Input