Example input
[technology, e.g., Python with Flask]: Python with Flask
[describe the issue, e.g., 'my web server crashes when I submit a form']: my web server crashes when I submit a form
[insert relevant code here]: @app.route('/submit', methods='POST') def submit_form(): data = request.form('data') process_data(data)
[error message]: KeyError: 'data'
[mention any solutions you've already attempted, e.g., 'checking for syntax errors and re-running the code']: checking for syntax errors and re-running the code
Example output
The error occurs because the data key might not always exist in the request.form dictionary. You can check for its existence before accessing it. Try this:
python
Sao chép mã
data = request.form.get('data')
if data:
process_data(data)
else:
# handle missing data
This will prevent the KeyError if data is missing from the form.