File upload processing in Flask - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Flask class.

Flask

from flask import [1]

Drag options to blanks, or click blank then click option'

Arender_template

BRequest

CFlask

Dredirect

Attempts:

3 left

💡 Hint

Common Mistakes

Importing Request instead of Flask

Using lowercase 'flask' instead of 'Flask'

The Flask class is imported from the flask module to create the app instance.

2fill in blank

medium

Complete the code to get the uploaded file from the request.

Flask

file = request.files.get('[1]')

Drag options to blanks, or click blank then click option'

Afile

Bfiledata

Cupload

Ddata

Attempts:

3 left

💡 Hint

Common Mistakes

Using keys like 'upload' or 'data' which don't match the form input name

Trying to get the file from request.form instead of request.files

The key 'file' is commonly used in HTML forms for file inputs and is accessed in Flask via request.files['file'] or get('file').

3fill in blank

hard

Fix the error in saving the uploaded file securely.

Flask

filename = secure_filename(file.[1])
file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))

Drag options to blanks, or click blank then click option'

Afilename

Bname

Cfilename_raw

Dfile_name

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'name' or 'file_name' which are not valid attributes

Trying to save without securing the filename

The uploaded file object has a 'filename' attribute that contains the original file name. This is passed to secure_filename() to sanitize it before saving.

4fill in blank

hard

Fill both blanks to check if the uploaded file exists and has an allowed extension.

Flask

if file and '.' [1] file.filename and file.filename.rsplit('[2]', 1)[1].lower() in ALLOWED_EXTENSIONS:

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A.

Bendswith

Cstartswith

Din

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'endswith' to check for '.' which is incorrect

Using wrong split character other than '.'

The code checks if the filename contains a dot '.' to separate the extension, then splits from the right on '.' to get the extension and checks if it is allowed.

5fill in blank

hard

Fill all three blanks to create a Flask route that accepts POST requests and processes file upload.

Flask

@app.route('/upload', methods=[[1]])
def upload_file():
    if [2] == 'POST':
        file = request.files.get('file')
        if file and allowed_file(file.filename):
            filename = secure_filename(file.[3])
            file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
            return 'File uploaded successfully'
    return 'Upload a file'

Drag options to blanks, or click blank then click option'

A'POST'

B'GET'

Crequest.method

Dfilename

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'GET' instead of 'POST' in methods

Checking request.method against 'GET' instead of 'POST'

Using wrong attribute instead of 'filename' for the file name

The route decorator specifies methods=['POST'] to accept uploads. The function checks if request.method == 'POST' to process the upload. The filename attribute of the file object is used to save the file securely.