Flask – how to write csv file & save using prefilled value of the filename (response.headers["Content-Disposition"]="attachment; filename=xxx")

I am trying to upload a CSV file with flask, read and process one line at a time while iterating through all rows of the file and write the results back to a new CSV file. My python script produces the correct results on its own, but I am not able to get the same results when using Flask. I am new

Uninstall and Re-install Python - Windows 10 issues

After I uninstalled Python 3.7and Python 3.9 and installed Python 3.9.5 and is displayed in Apps & features: Python 3.9.5 Python 3.9.5 (64-bit), size 101 MB, and Python Launcher, size 1.80 MB Upon checking the python version, I get the following error message: C:\>python --version Python was not