In this article, we will see how to get data from ImmutableMultiDict in the flask. It is a type of Dictionary in which a single key can have different values. It is used because some elements have multiple values for the same key and it saves the multiple values of a key in form of a list. It is usually used to get the Information passed in a Form.
Example:
Python3
from werkzeug.datastructures import ImmutableMultiDict data = ImmutableMultiDict([('input', 'GFG'), ('input', 'Geeks For Geeks')]) print(data.getlist('input')) |
Output:
['GFG', 'Geeks For Geeks']
Now, Let’s see how to get MultiDict data from the form in Flask. With some simple HTML code to make a form and submit it to a flask route.
After that, the request form object will be used to get the data from the form.
Folder Hierarchy
home.html
Make Sure this file is in the ‘templates’ folder
HTML
<!DOCTYPE html> <html> <head> <title>Input Page</title> </head> <body> <form method='POST'> <label for="username">Write Username:</label> <input type="text" name="username" id="uname"/> <label for="password">Write Password:</label> <input type="text" name="password" id="pword"/> <input type="submit" value="Submit"/> </form> </body> </html> |
Now create an app.py
Here, The home function is being used as the handler for the route, It simply renders the home.html file and when a POST at the URL. It simply returns the ‘im_dict’. It is nothing but actually, an ImmutableMultiDict which has all the data contained in the form.
Python3
from flask import Flask, render_template, request app = Flask(__name__) @app.route('/', methods=['GET', 'POST']) def home(): if request.method == 'POST': im_dict = request.form return(f'<h1>{im_dict}</h1>') return render_template('home.html') if __name__ == '__main__': app.run(debug=True) |
Output:
Write anything in the fields and press submit
This shows an ImmutableMultiDict with the keys ‘username’ and ‘password’.
