flask calling a function from another

Ananda Published at Dev

ananda

I am calling a function from another fuction.

The function I am calling

@app.route('/csv/')  
def download_csv(p): 
    csv = p
    response = make_response(csv)
    cd = 'attachment; filename=RosterUnified.csv'
    response.headers['Content-Disposition'] = cd 
    response.mimetype='text/csv'
    return response

In my HTML this is associated with a button click 'Download'.

I am calling this from within:

@app.before_request
def ros_before_app():
   . 
   .
   .





    z=open(Filename1)
    with z as f:
        p = f.read()
        download_csv(p) 

    z.close()
    else:
      z1=open(Filename)
      with z1 as f1:
        p = f1.read()
        download_csv(p)

The console gives the error:

    return self.view_functions[rule.endpoint](**req.view_args)
TypeError: download_csv() missing 1 required positional argument: 'p'

and the 'Download' button on click gives download failed, server problem

Preston Hager

In Flask the @app.route('/') decorator must contain any arguments that are passed into the function. You can do this by adding a <var> tag to the url. So the code you have might look like this,

@app.route('/csv/<p>')
def download_csv(p):
  csv = p
  # continue code here...

Variable, csv equals file if the URL is .../csv/file. Notice how instead of saying <p> we put in an argument that got passed into the function.

For even more infromation on variable passing in this decorator, look at Flask's Variable Rules.

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