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Learn how to create a list of dictionaries in Python by merging two lists together, taking into account the repeated keys. Follow our step-by-step guide for an easy solution!
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How to Create a List of Dictionaries by Merging Two Lists in Python

In Python programming, it’s common to encounter scenarios where you need to work with lists and dictionaries. One particular task you might find yourself faced with is merging two lists in a way that results in a list of dictionaries. This can be particularly handy when you have repeated keys and you want to map them to corresponding values.

The Problem

Suppose you have the following two lists:

[[See Video to Reveal this Text or Code Snippet]]

Your objective is to create a list of dictionaries such that:

Each dictionary in the list keys corresponds to the values in the lst.

The resulting dictionaries should look like this:

[[See Video to Reveal this Text or Code Snippet]]

However, when you try to achieve this using:

[[See Video to Reveal this Text or Code Snippet]]

You encounter a TypeError, stating that "zip argument -2 must support iteration".

The Solution

To resolve this issue, you need to ensure that you iterate over the keys correctly. Here's the step-by-step breakdown of the correct approach:

Understand the Structure: You need to create a dictionary for each sublist in the keys list, pairing the elements of the sublist with the elements in lst.

Use a List Comprehension: Employ a list comprehension to iterate over each sublist in keys and use the zip function to pair the keys with the values.

Construct the Dictionaries: Use the dict constructor to build dictionaries from the zipped pairs.

Here is how to do this in code:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Code

zip(i, lst): This function pairs each element of the current sublist i from keys with the corresponding element from lst.

dict(...): Converts the zipped pairs into a dictionary.

The list comprehension iterates through keys, creating a new dictionary for each sublist.

Output

When you run the above code, you will receive the following output:

[[See Video to Reveal this Text or Code Snippet]]

This output shows that we've successfully created a list of dictionaries with the specified mapping!

Conclusion

Creating a list of dictionaries by merging two lists in Python is straightforward when you follow the right approach. Always ensure to iterate correctly and use zip effectively to pair your keys with values. By applying the method outlined in this post, you can easily handle similar tasks in your Python programming adventures.

Whether you're a beginner or an experienced programmer, mastering these techniques can significantly improve your coding efficiency. Now, go ahead and implement this in your next project!