How can I implement file uploads in Flask using WTForms?

How can I implement file uploads in Flask using WTForms?

To implement file uploads in Flask using WTForms, you need to create a form class that includes a FileField.

Can you show me a code example for that?

Sure! Here's a simple example:

from flask import Flask, render_template, request
from flask_wtf import FlaskForm
from wtforms import FileField, SubmitField
from wtforms.validators import DataRequired

app = Flask(__name__)
app.secret_key = 'your_secret_key'

class UploadForm(FlaskForm):
    file = FileField('File', validators=[DataRequired()])
    submit = SubmitField('Upload')

@app.route('/', methods=['GET', 'POST'])
def upload():
    form = UploadForm()
    if form.validate_on_submit():
        file = form.file.data
        # Save the file or process it
        return 'File uploaded successfully!'
    return render_template('upload.html', form=form)

if __name__ == '__main__':
    app.run(debug=True)

What do I need to include in my HTML template?

In your HTML template, you need to include a form that allows file uploads. Here's an example:

<form method="POST" enctype="multipart/form-data">
    {{ form.hidden_tag() }}
    {{ form.file.label }}
    {{ form.file() }}
    {{ form.submit() }}
</form>