flask

Sending JSON and status code with a Flask response [duplicate]

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Use flask.jsonify(). This method takes any serializable data type. For example I have used a dictionary data in the following example. from flask import jsonify @app.route(‘/login’, methods=[‘POST’]) def login(): data = {‘name’: ‘nabin khadka’} return jsonify(data) To return a status code, return a tuple of the response and code: return jsonify(data), 200 Note that 200 … Read more

Getting first row from sqlalchemy

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Use query.one() to get one, and exactly one result. In all other cases it will raise an exception you can handle: from sqlalchemy.orm.exc import NoResultFound from sqlalchemy.orm.exc import MultipleResultsFound try: user = session.query(User).one() except MultipleResultsFound, e: print e # Deal with it except NoResultFound, e: print e # Deal with that as well There’s also … Read more

Flask app “Restarting with stat”

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Check your version of Werkzeug. Version 0.10 was just released and numerous changes went into the reloader. One change is that a default polling reloader is used; the old pyinotify reloader was apparently inaccurate. If you want more efficient polling, install the watchdog package. You can see the code related to this here. When Werkzeug … Read more

Serving a front end created with create-react-app with Flask

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import os from flask import Flask, send_from_directory app = Flask(__name__, static_folder=”react_app/build”) # Serve React App @app.route(“https://stackoverflow.com/”, defaults={‘path’: ”}) @app.route(‘/<path:path>’) def serve(path): if path != “” and os.path.exists(app.static_folder + “https://stackoverflow.com/” + path): return send_from_directory(app.static_folder, path) else: return send_from_directory(app.static_folder, ‘index.html’) if __name__ == ‘__main__’: app.run(use_reloader=True, port=5000, threaded=True) Thats what I ended up with. So bascially catch all … Read more

Get data from html and and pass the data back to the front end using ajax or js

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You can use ajax with Jquery. You can see this doc for more details. How to proceed: Configure js scripts In your HTML file template: Load Jquery: Load Jquery preferably before any other javascript files. Either statically: <script type=text/javascript src=”https://stackoverflow.com/questions/52870184/{{url_for(“static’, filename=”jquery.js”) }}”> </script> Or using Google’s AJAX Libraries API: <script src=”https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js”></script> <script>window.jQuery || document.write(‘<script src=”https://stackoverflow.com/questions/52870184/{{url_for(“static’, … Read more

Run Flask CLI command with PyCharm debugger

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PyCharm’s “Flask server” configuration only calls the flask run command, it doesn’t provide a way to call other commands. To do that, create a regular “Python” configuration that runs the flask command with the arguments you want. Create a “Python” configuration and give it a name. Select “Module name” instead of “Script path” and type … Read more

How to generate an html directory list using Python

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You could separate the directory tree generation and its rendering as html. To generate the tree you could use a simple recursive function: def make_tree(path): tree = dict(name=os.path.basename(path), children=[]) try: lst = os.listdir(path) except OSError: pass #ignore errors else: for name in lst: fn = os.path.join(path, name) if os.path.isdir(fn): tree[‘children’].append(make_tree(fn)) else: tree[‘children’].append(dict(name=name)) return tree To … Read more

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