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:
from werkzeug.datastructures import ImmutableMultiDict
data = ImmutableMultiDict([('input', 'GFG'), ('input', 'Geeks For Geeks')])
print(data.getlist('input'))
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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
<!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>
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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.
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)
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Output:
Write anything in the fields and press submit
This shows an ImmutableMultiDict with the keys ‘username’ and ‘password’.