Python – Concatenate Tuple to Dictionary Key

When it is required to concatenate tuple elements to form dictionary keys, a list comprehension and the join() method are used. This technique converts tuples into string keys while preserving their associated values.

Example

Below is a demonstration of the same ?

my_list = [(("pyt", "is", "best"), 10), (("pyt", "cool"), 1), (("pyt", "is", "fun"), 15)]

print("The list is :")
print(my_list)

my_result = {}
for sub_list in my_list:
    my_result[" ".join(sub_list[0])] = sub_list[1]

print("The result is :")
print(my_result)

Output

The list is :
[(('pyt', 'is', 'best'), 10), (('pyt', 'cool'), 1), (('pyt', 'is', 'fun'), 15)]
The result is :
{'pyt is best': 10, 'pyt cool': 1, 'pyt is fun': 15}

Using Dictionary Comprehension

You can also achieve the same result using dictionary comprehension for a more concise approach ?

my_list = [(("pyt", "is", "best"), 10), (("pyt", "cool"), 1), (("pyt", "is", "fun"), 15)]

my_result = {" ".join(tuple_key): value for tuple_key, value in my_list}

print("The result is :")
print(my_result)

The result is :
{'pyt is best': 10, 'pyt cool': 1, 'pyt is fun': 15}

How It Works

• A list of tuples is defined where each element contains a tuple (key elements) and a value.

• An empty dictionary is created to store the results.

• The list is iterated over, and join() concatenates tuple elements into string keys.

• Each concatenated string becomes a dictionary key with its corresponding value.

Conclusion

Use join() to concatenate tuple elements into dictionary keys. Dictionary comprehension provides a more concise alternative to traditional loops for this operation.