Question

How to declare and print an empty dictionary, add and append lists later in Python

Answer 1

from collections import defaultdict

data = defaultdict(list)
data["fruits"].append("red")
data["fruits"].append("blue")
data["fruits"].append("mango")

data["numbers"].append(1)
data["numbers"].append(2)
data["numbers"].append(3)

for key, value in data.items():
    print(key, ":", value)


'''
run:

fruits : ['red', 'blue', 'mango']
numbers : [1, 2, 3]

'''

 

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Answer 2

data = {}

data["fruits"] = []
data["fruits"].append("red")
data["fruits"].append("blue")
data["fruits"].append("blue")

data["numbers"] = []
data["numbers"].append(1)
data["numbers"].append(2)
data["numbers"].append(3)

for key, value in data.items():
    print(key, ":", value)


'''
run:

fruits : ['red', 'blue', 'blue']
numbers : [1, 2, 3]

'''

 

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