CODEWITHSUNDEEP
pythondictionary
John
John

Reputation: 29

Dictionary only printing from 2nd keys&values onwards?

I am trying to attempt a python question regarding queue.

I am wondering why the dictionary is only printing values from the 2nd key and value pair. Why is the first pair not being printed?

Here are the relevant codes:

n = int(input("Enter total number of people queueing."))
dict = {}

for i in range(n):
    inputKey = input("Select your choice of queue. Please enter 'M' for main queue or 'T' for team queue.\n")
    inputValue = input("Enter your name: ")
    dict[inputKey] = inputValue

print(dict)

Sample Input:

3
M
Bella
M
Swan
T
Cullen

Actual Output:

{'M': 'Swan', 'T': 'Cullen'}

Expected Output:

{'M': 'Bella', 'M': 'Swan', 'T': 'Cullen'}

Upvotes: 1

Views: 85

Answers (1)

Loic RW
Loic RW

Reputation: 444

As Sayse explains, you are overwriting the values.

If you would like to append new entries you could use the following:

n = int(input("Enter total number of people queueing."))
dictionary = {}

for i in range(n):
    inputKey = input("Select your choice of queue. Please enter 'M' for main queue or 'T' for team queue.\n")
    inputValue = input("Enter your name: ")
    if inputKey in dictionary:
        dictionary[inputKey].append(inputValue)
    else:
        dictionary[inputKey] = [inputValue]

print(dictionary)

It would return the following output:

{'M': ['Bella', 'Swan'], 'T': ['Cullen']}

I would also avoid naming dictionaries dict.

As keys need to be unique in a dict, your expected output of {'M': 'Bella', 'M': 'Swan', 'T': 'Cullen'} is not possible.

If you were a dict and someone asked you to return the value for the key M, what value would you return, Bella or Swan?

Upvotes: 1

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