How Can I Retrieve a Dictionary Key Based on Its Value in Python?

Retrieving Key from Dictionary Based on Value

In Python, retrieving the key associated with a specific value within a dictionary can be challenging for beginners. Consider the following scenario:

You have created a function to search for ages within a dictionary and display the corresponding name. However, you face two obstacles: you need help retrieving the name from the age and avoiding a KeyError encountered in line 5.

Solution:

To overcome this challenge, you can utilize the built-in methods keys() and .values() in Python. Here's the approach:

mydict = {'george': 16, 'amber': 19}

# Convert dictionary values to a list
value_list = list(mydict.values())

# Find the index of the searched value within the list
value_index = value_list.index(16)

# Retrieve the key associated with the index found in the value list
key = list(mydict.keys())[value_index]

# Print the retrieved key
print(key)  # Output: george

This approach allows you to efficiently search for the key by its corresponding value, avoiding the KeyError and providing the desired output.

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