[Python] Create a download link for generated CSV file in flask [duplicate]

I have a Python web application where user upload an image and the code is generating a CSV from that image. What i need is to return that csv to app.py and display it on the frontend for user to download it. How i achieve that?

app.py

# Route to show processed files
@app.route('/view_process', endpoint='view_process')
def process_files():

if not session.get('logged_in'):
return redirect(url_for('login_user'))

subprocess.run(['python', 'inference.py'])

return render_template('view_process.html', message='Files processed sucessfully')


Inference.py

from utils import *

processInputs(cfg, outputs, im_bgr_list, output_directory, im_names)


Utils.py

def processInputs(cfg, outputs, im_bgr_list, output_directory, im_names):

getSegmentationCsv(outputs,im_bgr_list,im_names,output_directory)

def getSegmentationCsv(output,im_bgr,im_name, output_dir):
df = pd.concat([df1,df2],axis=1)

# Give the filename you wish to save the file to
filename = output_dir+im_name.split('.')[0] + '.csv'

# Use this function to search for any files which match your filename
files_present = glob.glob(filename)


# if no matching files, write to csv, if there are matching files, print statement
if not files_present:
df.to_csv(filename, index = False)

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