Python Convert KeyValues List to Flat Dictionary (original) (raw)

Last Updated : 25 Oct, 2025

Given a list of key-value pairs, the task is to convert it into a flat dictionary. **For example:

**Input: [("name", "Ak"), ("age", 25), ("city", "NYC")]
**Output: {'name': 'Ak', 'age': 25, 'city': 'NYC'}

Below are multiple methods to convert a key-value list into a dictionary efficiently.

Using dict()

dict() constructor converts a list of key-value pairs into a dictionary by using each sublist's first element as a key and the second element as a value. This results in a flat dictionary where the key-value pairs are mapped accordingly.

Python `

a = [("name", "Emma"), ("age", 25), ("city", "New York")] res = dict(a) print(res)

`

Output

{'name': 'Emma', 'age': 25, 'city': 'New York'}

Using Dictionary Comprehension

Dictionary comprehension {key: value for key, value in a} iterates through the list a, unpacking each tuple into key and value. It then directly creates a dictionary by assigning the key to its corresponding value.

Python `

a = [("name", "Emma"), ("age", 25), ("city", "New York")]
res = {key: value for key, value in a} print(res)

`

Output

{'name': 'Emma', 'age': 25, 'city': 'New York'}

Using a Loop

For loop iterates through each tuple in the list 'a', extracting the key and value, and then adds them to a dictionary. The dictionary is built incrementally by mapping each key to its corresponding value.

Python `

a = [("name", "Emma"), ("age", 25), ("city", "New York")] b = {} for key, value in a: b[key] = value

print(b)

`

Output

{'name': 'Emma', 'age': 25, 'city': 'New York'}

**Explanation:

Using zip()

zip() function pairs the keys from a with corresponding values from b, creating key-value pairs. These pairs are then converted into a dictionary using dict().

Python `

a = ["name", "age", "city"] # List of keys b = ["Emma", 25, "New York"] # List of values res = dict(zip(a, b)) print(res)

`

Output

{'name': 'Emma', 'age': 25, 'city': 'New York'}

**Explanation: