Скачать или смотреть Creating a Python Dictionary with Multiple Values from Two Lists

Learn how to effectively create a Python dictionary that associates keys with multiple values from lists derived from a text file!
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This video is based on the question https://stackoverflow.com/q/65442110/ asked by the user 'sonodan' ( https://stackoverflow.com/u/14635599/ ) and on the answer https://stackoverflow.com/a/65442222/ provided by the user 'Lazar' ( https://stackoverflow.com/u/4903534/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Creating a Python Dictionary with Multiple Values from Two Lists

You might find yourself in a common situation while programming in Python: needing to create a dictionary that contains keys with multiple associated values. If you have data structured in a text file, like in our example, this process can seem a bit daunting. Let's break it down step-by-step!

The Problem

Imagine you have a text file with coordinate data formatted like this:

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

Your goal is to convert this data into a Python dictionary such that the keys are the identifiers (C1, C2, C3) and the values are lists of numbers associated with those identifiers, resulting in:

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

The Solution

Step 1: Read the Data from the Text File

First, you need to read the contents of the file into your script. This is done by opening the file and reading each line to get the data. Here’s an example:

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

This opens the file named frameData.txt, reads all the lines, and then closes the file.

Step 2: Create the Dictionary

Now comes the fun part — creating the dictionary. You can use a loop to go through each line, split the line by commas to separate the keys from the values, and then populate the dictionary.

Here’s the code for this:

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

Loop through each line: This will allow you to handle multiple entries in your text file.

Splitting the line: The split(',') method converts the line into a list of items based on the comma separator.

Creating lists of integers: The map function applies int to each value (except the first item, which is the key) to convert them from strings to integers.

Step 3: Display the Result

Finally, you can print your result to see the structured dictionary:

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Complete Python Code

Here’s the complete code for your reference:

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

Conclusion

Creating a dictionary with keys that hold multiple values from two lists is definitely achievable with the right approach. By following the structured steps above, you’ll be able to transform your text file data into a usable dictionary format in Python.

Key Takeaways:

Use splitlines() to read data line by line.

Use split(',') to separate keys and values.

map can convert string representations of numbers into actual integers.

Now that you have your dictionary set up, you can go on to use it in your projects or analyses effortlessly. Happy coding!