Ways to extract all dictionary values | Python

While working with Python dictionaries, there can be cases in which we are just concerned about getting the values list and don’t care about keys. This is yet another essential utility and solution to it should be known and discussed. Let’s perform this task through certain methods. 

Method #1 : Using loop + keys() The first method that comes to mind to achieve this task is the use of loop to access each key’s value and append it into a list and return it. This can be one of method to perform this task. 

Python3

# Python3 code to demonstrate working of
# Ways to extract all dictionary values
# Using loop + keys()

# initializing dictionary
test_dict = {'gfg' : 1, 'is' : 2, 'best' : 3}

# printing original dictionary
print("The original dictionary is : " + str(test_dict))

# Extracting all dictionary values
# Using loop + keys()
res = []
for key in test_dict.keys() :
    res.append(test_dict[key])

# printing result
print("The list of values is : " +  str(res))

Output : 

The original dictionary is : {'gfg': 1, 'is': 2, 'best': 3}
The list of values is : [1, 2, 3]

Time Complexity: O(n)
Auxiliary Space: O(n)

Method #2 : Using values() This task can also be performed using the inbuilt function of values(). This is the best and most Pythonic way to perform this particular task and returns the exact desired result. 

Python3

# Python3 code to demonstrate working of
# Ways to extract all dictionary values
# Using values()

# initializing dictionary
test_dict = {'gfg' : 1, 'is' : 2, 'best' : 3}

# printing original dictionary
print("The original dictionary is : " + str(test_dict))

# Extracting all dictionary values
# Using values()
res = list(test_dict.values())

# printing result
print("The list of values is : " +  str(res))

Output : 

The original dictionary is : {'gfg': 1, 'is': 2, 'best': 3}
The list of values is : [1, 2, 3]

Time Complexity: O(n), where n is the length of the list test_dict
Auxiliary Space: O(n) additional space of size n is created where n is the number of elements in the res list

Method #3: Using a list comprehension

We can also use a list comprehension to extract all the values from the dictionary.
The advantage of this approach is that it can be more concise and readable than using loops.
We can simply iterate over the values of the dictionary and add them to a list.

Python3

# Python3 code to demonstrate working of
# Ways to extract all dictionary values
# Using list comprehension

# initializing dictionary
test_dict = {'gfg' : 1, 'is' : 2, 'best' : 3}

# printing original dictionary
print("The original dictionary is : " + str(test_dict))

# Extracting all dictionary values
# Using list comprehension
res = [val for val in test_dict.values()]

# printing result
print("The list of values is : " +  str(res))

Output

The original dictionary is : {'gfg': 1, 'is': 2, 'best': 3}
The list of values is : [1, 2, 3]

Time Complexity: O(n), where n is the number of elements in the dictionary.

Auxiliary Space: O(n), where n is the number of elements in the dictionary.