Sometimes, while working with Python dictionaries, we can have a problem in which we need to extract particular key on basis of other matching record keys when there is exact match. Lets discuss certain ways in which this task can be performed.
Here's a Python program that can extract a target key from other key values:
# Define a dictionary with key-value pairs data = { "name": "John", "age": 30, "city": "New York" } # Define a function to extract a target key from the dictionary def extract_target_key(data, target_key): # Check if the target key exists in the dictionary if target_key in data: return data[target_key] else: # If the target key does not exist, return None return None # Call the function to extract the "age" key from the dictionary result = extract_target_key(data, "age") # Print the result print(result) # Output: 30
In this program, we first define a dictionary data
with key-value pairs. We then define a function extract_target_key
that takes two arguments: data
(the dictionary) and target_key
(the key we want to extract).
Inside the function, we check if the target_key
exists in the data
dictionary using the in
keyword. If it does exist, we return the corresponding value using the square bracket notation (data[target_key]
). If the target_key
does not exist, we return None
.
Finally, we call the extract_target_key
function with the data
dictionary and the "age"
key as arguments, and print the result.