How to make a dictionary (dict) from separate lists of keys and values?

Often, we need to create a dictionary from separate lists of keys and values. in this Python example we will discuss some o the ways to create a dictionary from separate lists in Python.

Some of the topics which will be helpful for understanding the program implementation better are:

• List in Python
• Function in Python
• Dictionary in Python

1. Using zip() Function

One of the simplest ways to create a dictionary from separate lists is to use the zip() function. The zip() function returns an iterator that aggregates elements from each of the input iterables.

Now let’s implement a program to create a dictionary from 2 separate lists.

keys = ['One', 'Two', 'Three']
values = [1, 2, 3]
my_dict = dict(zip(keys, values))
print(my_dict)

Output
{'One': 1, 'Two': 2, 'Three': 3} 

2. Using a Dictionary Comprehension

We can use a dictionary comprehension to iterate over the keys and values lists simultaneously and create a dictionary.

Now lets implement the example again

keys = ['One', 'Two', 'Three']
values = [1, 2, 3]
my_dict = {keys[i]: values[i] for i in range(len(keys))}
print(my_dict)

Output
{'One': 1, 'Two': 2, 'Three': 3} 

There are other ways like using a for loop to add elements to the empty dictionary but honestly, these are the better ways than implementing using a for loop. So we will skip that example for now, but I would still recommend you to write the example using for loop only.

3. Conclusion

In this Python example, we discussed multiple ways to create a dictionary from separate lists of keys and values.

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