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

	
		
			< >
			Input
		
		
			Python
			
		
	
	
		dictionary = {
          "id": 1,
          "name": "John",
          "age": 30
      }
	
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If we want to obtain the value of the age, what is usually done is dictionary["age"]

	
		
			< >
			Input
		
		
			Python
			
		
	
	
		dictionary = {
    "id": 1,
    "name": "John",
    "age": 30
}
dictionary["age"]
	
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>_ Output

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

	
		
			< >
			Input
		
		
			Python
			
		
	
	
		dictionary["country"]
	
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>_ Output

			
				---------------------------------------------------------------------------
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

	
		
			< >
			Input
		
		
			Python
			
		
	
	
		try:
    dictionary["country"]
except KeyError:
    print("Key not found")
	
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>_ Output

			
				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.

	
		
			< >
			Input
		
		
			Python
			
		
	
	
		dictionary.get("country", "Key not found")
	
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>_ Output

			
				'Key not found'

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

	
		
			< >
			Input
		
		
			Python
			
		
	
	
		country = dictionary.get("country")
print(country)
	
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>_ Output

			
				None

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