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It seems like you are passing x value as string in a dataPoint. x value can either be a numeric value or a dateTime value. Please take look at this sample project for integration of CanvasJS with python flask.
If you are still facing the issue in integrating CanvasJS charts with python flask, kindly share a sample project along with sample data reproducing the issue over Google Drive / OneDrive so that we can look into your code, understand it better and help you out.