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As per the code snippet shared above, it looks like you are passing x-value as string in a dataPoint, whereas x-value can either be a numeric value or a dateTime value. Here is how you can make modify your index.html file:

        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <title>CanvasJS Chart Python Flask Sample</title>
        <script type="text/javascript" src="https://cdn.canvasjs.com/canvasjs.min.js"></script>
        <script type="text/javascript">
            window.onload = function() {
                var dps = [
                            {% for key,value in data.items() %}
                                { x: {{key}}, y: {{value}} },
                            {% endfor %}
                var chart = new CanvasJS.Chart("chartContainer", {
                        text: "CanvasJS Chart Python Flask Sample"              
                    data: [              
                        // Change type to "doughnut", "line", "splineArea", etc.
                        type: "column",
                        dataPoints: dps
        <style type="text/css">
        <div id="chartContainer" style="width: 100%; height: 300px;"></div>

You can also take look at this sample project for a working example with sample code on the integration of CanvasJS with python flask.

If you are still facing the issue in integrating CanvasJS charts with python flask, kindly create a sample project reproducing the issue you are facing and share it with us(along with sample data) over Google-Drive or Onedrive so that we can run the sample locally at our end to understand the scenario better and help you out?

CanvasJS Chart Python-Flask sample

Manoj Mohan
Team CanvasJS