Скачать или смотреть How to Set Random Values in a Python Dictionary for Selected Keys

Discover how to efficiently assign random values to specific keys in a Python dictionary, while keeping the other values copied from those keys.
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This video is based on the question https://stackoverflow.com/q/68117392/ asked by the user 'oakca' ( https://stackoverflow.com/u/5852692/ ) and on the answer https://stackoverflow.com/a/68117552/ provided by the user '4.Pi.n' ( https://stackoverflow.com/u/11273124/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Setting Random Values in a Python Dictionary

When working with dictionaries in Python, there are often scenarios where you'll need to assign specific values to certain keys. In this post, we'll address a common problem: how to assign random values to just a portion of the keys in a dictionary while duplicating those values for their corresponding pairs. Let's dive into the solution and learn how to implement this effectively.

The Problem at Hand

You may have created a Python dictionary using a list, resulting in all values initially set to None. For example:

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Your goal is to randomly assign values to the first two keys (in this case, ('A', 'B') and ('A', 'C')) using random.uniform(0, 1). Meanwhile, you want the values of the remaining keys (('B', 'A') and ('C', 'A')) to be the same as those of their paired keys without hardcoding their values.

The Solution

Step 1: Initialize a Visited Set

We'll use a set to keep track of which keys we have already modified, which allows us to avoid hardcoding keys directly and ensures that we copy the right values where necessary.

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Step 2: Loop Through the Dictionary

We will iterate through the dictionary, check if the key has already been visited. If yes, we'll skip assigning a new value to it.

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Here, key[::-1] is used to get the reverse of the current key, ensuring that both sides of the pair are covered.

Step 3: Assign Random Values

Next, we will generate a random value for the current key and assign it to both the current and its reversed key in the dictionary.

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Full Implementation

Here’s the complete code snippet that combines all the steps:

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Advanced Approach: Hashing Keys

To enhance our solution and make it more dynamic, consider using a hashing function to ensure that the order of tuples doesn’t matter. This will allow us to assign values consistently even if keys are reversed.

Define a Hash Function

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Assign Random Values Using Hashed Seeds

Utilize a global seed to produce consistent randomness across function calls:

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Conclusion

By following these steps, you can efficiently randomize values for half of your dictionary while maintaining consistency across mirrored keys. This method is scalable and adaptable, allowing for future changes without extensive rewrites.

Now, try implementing this in your own projects and see how efficiently you can handle your data!