How to get value from dictionary python

Getting Values from a Dictionary in Python

Artturi Jalli

To access all values in a dictionary in Python, call the values() method.

Or if you want to get a single value, use the square bracket [] access operator:

This is the quick answer. But let’s take a more detailed look at accessing dictionary values in Python.

How to Get All Dictionary Values in Python

If you want to get all the values of a dictionary, use the values() method.

This returns a dict_keys object. But you can convert it to a list using the list() function:

Now, this list contains all the values from the dictionary (the player numbers):

How to Get a Dictionary Value in Python

There are two ways to access a single value of a dictionary:

Get a Dictionary Value with Square Brackets

To get a single value from a dictionary, use the square brackets approach.

To do this, place the key whose value you are looking for inside square brackets after the dictionary:

The problem with this approach is if there is no such key-value pair in the dictionary, an error is thrown and your program crashes.

For instance, let’s try to get a number of a player that does not exist:

To overcome this issue, use the get() method to get a value from a dictionary instead.

Python Dictionary get() Method

In addition to using square brackets to access dictionary values in Python, you can use the get() method.

To do this, enter the key whose value you are searching inside the get() method.

Now if you try to access a non-existent value from the dictionary, you get a None back. This is better as your program does not crash even the value you are looking for is not there:

Conclusion

To access a dictionary value in Python you have three options:

Using get() is safe because it returns None if the value is not found. Using square brackets crashes your program if the value is not found.

Thanks for reading. I hope you found the values you were looking for.

Get Value from Dictionary Python

This tutorial will discuss using the get() function to get a value in a Python dictionary.

How to Define a Python Dictionary

Let us start at the very basics: learning how to define a dictionary in Python. Since python dictionaries are expressed in key-value pairs, each key in a dictionary must be unique.

To define a dictionary, we add comma-separated values inside a pair of curly braces. The comma-separated values represent key:value.

The following is an example of a simple dictionary:

Each key in a dictionary gets automatically mapped to its corresponding value.

How to Access Dictionary Values

To access a specific value in a dictionary, you can use the dictionary name, followed by the specific key in square brackets.

This should automatically return the value stored in the key “key1”. The result is as shown below:

How to Get Values from Dictionaries Using the Python Get Method

Python also provides us with a method to retrieve values mapped to a specific key in a dictionary: the get method. The Python get() method accepts the key as an argument and returns the value associated with the key.

If the specified key is not found, the method returns a None type. You can also specify the default return value if the key is not found.

The syntax for the method is:

NOTE: The value, in this case, is not the value in the dictionary key but the return value if the key is not found.

Suppose we have a dictionary of programming languages mapped to their authors as:

«Ruby» : «Yukihoro Matsumoto»

In this case, we can use the get method to get the creator of a specific language. For example, the code below shows the author of Ruby.

If we specify a non-existent key, we should get “Key not Found!” Error.

Conclusion

As this tutorial has shown you, you can use the default indexing method to retrieve a value from a Python dictionary or the get() method. Choose what works for you and stick with it.

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John Otieno

My name is John and am a fellow geek like you. I am passionate about all things computers from Hardware, Operating systems to Programming. My dream is to share my knowledge with the world and help out fellow geeks. Follow my content by subscribing to LinuxHint mailing list

How To Get Dictionary Value By Key Using Python

In this tutorial, learn how to get dictionary value by key in Python. The short answer is to use the Python get() function to find the value of a known key.

The dictionary contains the keys with its associated values. The values in the dictionary variable can be identified by the key. However, if you want to know more about the dictionary, you may like to read Python Dictionary.

Table of Contents

Get Dictionary Value By Key With Get() in Python

To get the value of the key you want, you have to use the get() function using Python. The function requires a single argument which is the key in the dictionary.

The below example contains 6 elements with both keys and the associated value of the dictionary. Use the method given below to get the value using the get() with Python.

The above example finds the value of the key “one” of Dictionary in Python. This gives value in Dictionary for the single key given. However, to get more values with the keys, you have to use the get function again.

Find the Value Using Index Operator in Python

In addition to the above method, you can also get the values by keys in Dictionary. You have to use the Python index operator([]) to find the value of the given key.

The index operator requires a single argument to pass. You have to just pass the known key as the argument of the index operator. See the below method to get the use of index operator to get values.

Access an arbitrary element in a dictionary in Python

If a mydict is not empty, I access an arbitrary element as:

Is there any better way to do this?

13 Answers 13

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On Python 3, non-destructively and iteratively:

On Python 2, non-destructively and iteratively:

If you want it to work in both Python 2 and 3, you can use the six package:

though at this point it is quite cryptic and I’d rather prefer your code.

If you want to remove any item, do:

Note that «first» may not be an appropriate term here because dict is not an ordered type in Python dicts are ordered.

If you only need to access one element (being the first by chance, since dicts do not guarantee ordering) you can simply do this in Python 2:

Please note that (at best of my knowledge) Python does not guarantee that 2 successive calls to any of these methods will return list with the same ordering. This is not supported with Python3.

In python3, The way :

return a value in type : dict_keys(), we’ll got an error when got 1st member of keys of dict by this way:

Finally, I convert dict.keys() to list @1st, and got 1st member by list splice method:

to get a key

to get a value

to get both

The first two are Python 2 and 3. The last two are lazy in Python 3, but not in Python 2.

As others mentioned, there is no «first item», since dictionaries have no guaranteed order (they’re implemented as hash tables). If you want, for example, the value corresponding to the smallest key, thedict[min(thedict)] will do that. If you care about the order in which the keys were inserted, i.e., by «first» you mean «inserted earliest», then in Python 3.1 you can use collections.OrderedDict, which is also in the forthcoming Python 2.7; for older versions of Python, download, install, and use the ordered dict backport (2.4 and later) which you can find here.

Python 3.7 Now dicts are insertion ordered.

How about, this. Not mentioned here yet.

py 2 & 3

Ignoring issues surrounding dict ordering, this might be better:

This way we avoid item lookup and generating a list of keys that we don’t use.

How can I extract all values from a dictionary in Python?

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For Python 3, you need:

If you want all of the values, use this:

If you want all of the keys, use this:

IF you want all of the items (both keys and values), I would use this:

Call the values() method on the dict.

If you want all of the values, use this:

Code of python file containing dictionary

If you want to print only values (instead of key) then you can use :

This will print only values instead of key from dictionary

To see the keys:

To get the values that each key is referencing:

I know this question been asked years ago but its quite relevant even today.