Get data of dictionaries

21 of october of 2024

Obtener datos de diccionarios

Disclaimer: This post has been translated to English using a machine translation model. Please, let me know if you find any mistakes.

Let's imagine that we have the following dictionary

	
		dictionary = {
          "id": 1,
          "name": "John",
          "age": 30
      }

If we want to obtain the value of the age, what is usually done is dictionary["age"]

	
		dictionary = {
    "id": 1,
    "name": "John",
    "age": 30
}
dictionary["age"]

But, what happens if the key we put in is not in the dictionary? Will it give us an error?

	
		dictionary["country"]

	
		---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
Cell In[4], line 1
----> 1 dictionary["country"]
KeyError: 'country'

So if this happens in production, the program will crash

So to solve it we can use a try except to handle the error

	
		try:
    dictionary["country"]
except KeyError:
    print("Key not found")

	
		Key not found

But another solution to avoid filling the code with try except is to use the get method which allows us to obtain the value of a key and if it doesn't exist, it returns a default value.

	
		dictionary.get("country", "Key not found")

	
		'Key not found'

Another option is not to include the second option, in which case we get None if the key does not exist.

	
		country = dictionary.get("country")
print(country)

	
		None

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