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Passing values ​​from one html page to another via Flask (Python)

My web app currently has 3 pages. I got user input on the first page, which I passed to my view.py, and figured out some variables that I need for my second page. I want to pass variables that exist on my second page to the third page, but I don't know how. Any suggestions on how to change the html for the 2nd page to achieve this?

So far I have been solving this problem by creating global variables my.py. This seems to work, but does not seem to be a viable long term solution.

Thank!

existing variables: thePrediction, theData

html for the second page:

        <div class = "caption-full">
              <h3>Currently, I have a {{thePercentage}} chance of getting adopted.</h3>
            {% if thePrediction[1] + thePrediction[2] >0%}
                <form action="/third_page" method="GET">
                    <button class="btn btn-large btn-info" >Go to third page</button>
                </form>

            {% endif %}
        </div>
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I think I figured it out:



<div class = "caption-full">
                  <h3>Currently, I have a {{thePercentage}} chance of getting adopted.</h3>
                {% if thePrediction[1] + thePrediction[2] >0%}

                    <form action="/third_page" method="GET">
                        <input type="hidden" name="alignment" value="{{thePassedValue}}" />
                        <button class="btn btn-large btn-info" >Go to third page</button>

                    </form>

                {% endif %}
            </div>
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