flask | The Python micro framework for building web applications | Web Framework library

 by   pallets Python Version: 3.0.3 License: BSD-3-Clause

kandi X-RAY | flask Summary

kandi X-RAY | flask Summary

flask is a Python library typically used in Server, Web Framework, Framework applications. flask has no bugs, it has no vulnerabilities, it has a Permissive License and it has high support. However flask build file is not available. You can install using 'pip install flask' or download it from GitHub, PyPI.

The Python micro framework for building web applications.

            kandi-support Support

              flask has a highly active ecosystem.
              It has 63300 star(s) with 15695 fork(s). There are 2145 watchers for this library.
              There were 3 major release(s) in the last 6 months.
              There are 0 open issues and 2509 have been closed. On average issues are closed in 1 days. There are 1 open pull requests and 0 closed requests.
              It has a negative sentiment in the developer community.
              The latest version of flask is 3.0.3

            kandi-Quality Quality

              flask has 0 bugs and 0 code smells.

            kandi-Security Security

              flask has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              flask code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              flask is licensed under the BSD-3-Clause License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              flask releases are available to install and integrate.
              Deployable package is available in PyPI.
              flask has no build file. You will be need to create the build yourself to build the component from source.
              flask saves you 4755 person hours of effort in developing the same functionality from scratch.
              It has 10184 lines of code, 1378 functions and 96 files.
              It has medium code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed flask and discovered the below as its top functions. This is intended to give you an instant insight into flask implemented functionality, and help decide if they suit your requirements.
            • Generate a URL for an endpoint
            • Inject url defaults
            • Handles URL build errors
            • Create a URL adapter
            • Add a url rule
            • Defines a GET rule
            • Creates a route for a method
            • Register this blueprint
            • Creates a blueprint setup state
            • Serialize obj to fp
            • Copy the current request context
            • Handle registration
            • Return a logger instance
            • Handle login
            • Create a new blog
            • Add a before_first_request function to the blueprint
            • Callback to load an env file
            • Deprecated
            • Returns a response object
            • Create a config object
            • Run command
            • Create a JSON response
            • Create a route callable
            • Saves a session
            • Create a flask app
            • Run shell
            Get all kandi verified functions for this library.

            flask Key Features

            No Key Features are available at this moment for flask.

            flask Examples and Code Snippets

            包含 WSGI - Flask,Django,其它-检查
            Pythondot img1Lines of Code : 4dot img1License : Permissive (MIT)
            copy iconCopy
            Hello, World from Flask!
                "message": "Hello World"
            Including WSGI - Flask, Django, others-Check it
            Pythondot img2Lines of Code : 4dot img2License : Permissive (MIT)
            copy iconCopy
            Hello, World from Flask!
                "message": "Hello World"
            Pythondot img3Lines of Code : 1dot img3License : Permissive (MIT)
            copy iconCopy
            Have a simple and easy to use routing system.
            flask - auth
            Pythondot img4Lines of Code : 75dot img4License : Non-SPDX (BSD 3-Clause "New" or "Revised" License)
            copy iconCopy
            import functools
            from flask import Blueprint
            from flask import flash
            from flask import g
            from flask import redirect
            from flask import render_template
            from flask import request
            from flask import session
            from flask import url_for
            from werkzeug.securit  
            flask - test blog
            Pythondot img5Lines of Code : 58dot img5License : Non-SPDX (BSD 3-Clause "New" or "Revised" License)
            copy iconCopy
            import pytest
            from flaskr.db import get_db
            def test_index(client, auth):
                response = client.get("/")
                assert b"Log In" in response.data
                assert b"Register" in response.data
                response = client.get("/")
                assert b"tes  
            flask - test auth
            Pythondot img6Lines of Code : 46dot img6License : Non-SPDX (BSD 3-Clause "New" or "Revised" License)
            copy iconCopy
            import pytest
            from flask import g
            from flask import session
            from flaskr.db import get_db
            def test_register(client, app):
                # test that viewing the page renders without template errors
                assert client.get("/auth/register").status_code == 200
            Can I add two classes to an element in html in other places?
            Pythondot img7Lines of Code : 2dot img7License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
          • How to make flask handle 25k request per second like express.js
            Pythondot img8Lines of Code : 5dot img8License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            gunicorn -w 4 --threads 100 -b your_project:app
            pip install gevent
            gunicorn -w 4 -k gevent --worker-connections 1000 -b your_project:app
            make every function of a file start with the same call to an external function
            Pythondot img9Lines of Code : 19dot img9License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            def verified():
                return False
            def redirect():
            def verify(func):
                if verified():
                    return func
                    return redirect
            def myfunc():
            Why does my data come from request.form when passing it to the backend in Flask, python?
            Pythondot img10Lines of Code : 50dot img10License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            def message_server(msg):
              /* Do something here */
            /* You need to load socketio, you can look it up at socket.io, the link above also have instructions */
             ​let​ ​socket​ ​=​&nb

            Community Discussions


            Python/Docker ImportError: cannot import name 'json' from itsdangerous
            Asked 2022-Mar-31 at 12:49

            I am trying to get a Flask and Docker application to work but when I try and run it using my docker-compose up command in my Visual Studio terminal, it gives me an ImportError called ImportError: cannot import name 'json' from itsdangerous. I have tried to look for possible solutions to this problem but as of right now there are not many on here or anywhere else. The only two solutions I could find are to change the current installation of MarkupSafe and itsdangerous to a higher version: https://serverfault.com/questions/1094062/from-itsdangerous-import-json-as-json-importerror-cannot-import-name-json-fr and another one on GitHub that tells me to essentially change the MarkUpSafe and itsdangerous installation again https://github.com/aws/aws-sam-cli/issues/3661, I have also tried to make a virtual environment named veganetworkscriptenv to install the packages but that has also failed as well. I am currently using Flask 2.0.0 and Docker 5.0.0 and the error occurs on line eight in vegamain.py.

            Here is the full ImportError that I get when I try and run the program:



            Answered 2022-Feb-20 at 12:31

            I was facing the same issue while running docker containers with flask.

            I downgraded Flask to 1.1.4 and markupsafe to 2.0.1 which solved my issue.

            Check this for reference.

            Source https://stackoverflow.com/questions/71189819


            TypeError: __init__() got an unexpected keyword argument 'as_tuple'
            Asked 2022-Mar-29 at 23:24

            While I am testing my API I recently started to get the error below.



            Answered 2022-Mar-29 at 13:29

            As of version 2.1.0, werkzeug has removed the as_tuple argument to Client. Since Flask wraps werkzeug and you're using a version that still passes this argument, it will fail. See the exact change on the GitHub PR here.

            You can take one of two paths to solve this:

            1. Upgrade flask

            2. Pin your werkzeug version

            Source https://stackoverflow.com/questions/71661851


            in VS Code ImportError: cannot import name 'Mapping' from 'collections'
            Asked 2022-Mar-24 at 11:58

            I am trying to connect to Postgress and create a folder test.db via Flask. When I run "python3" in the terminal and from there when I run "from app import db" I get an import error:



            Answered 2021-Oct-11 at 10:45

            Use older version of python (eg 3.8)

            Source https://stackoverflow.com/questions/69381312


            How to set schema_translate_map in SQLAlchemy object in Flask app
            Asked 2022-Feb-19 at 23:10

            My app.py file



            Answered 2022-Feb-19 at 23:10

            I found a way to accomplish it. This is what needed

            Source https://stackoverflow.com/questions/71099132


            WebSocket not working when trying to send generated answer by keras
            Asked 2022-Feb-17 at 12:52

            I am implementing a simple chatbot using keras and WebSockets. I now have a model that can make a prediction about the user input and send the according answer.

            When I do it through command line it works fine, however when I try to send the answer through my WebSocket, the WebSocket doesn't even start anymore.

            Here is my working WebSocket code:



            Answered 2022-Feb-16 at 19:53

            There is no problem with your websocket route. Could you please share how you are triggering this route? Websocket is a different protocol and I'm suspecting that you are using a HTTP client to test websocket. For example in Postman:

            Postman New Screen

            HTTP requests are different than websocket requests. So, you should use appropriate client to test websocket.

            Source https://stackoverflow.com/questions/71099818


            Google app engine deployment fails- Error while finding module specification for 'pip' (AttributeError: module '__main__' has no attribute '__file__')
            Asked 2022-Jan-08 at 22:02

            We are using command prompt c:\gcloud app deploy app.yaml, but get the following error:



            Answered 2022-Jan-06 at 09:24

            Your setuptools version is likely to be yanked:


            Not sure how to fix that without a working pip though.

            Source https://stackoverflow.com/questions/70602290


            localhost:5000 unavailable in macOS v12 (Monterey)
            Asked 2021-Dec-08 at 14:08

            I cannot access a web server on localhost port 5000 on macOS v12 (Monterey) (Flask or any other).

            E.g., use the built-in HTTP server, I cannot get onto port 5000:



            Answered 2021-Dec-08 at 14:08

            macOS Monterey introduced AirPlay Receiver running on port 5000. This prevents your web server from serving on port 5000. Receiver already has the port.

            You can either:

            1. turn off AirPlay Receiver, or;
            2. run the server on a different port (normally best).

            Turn off AirPlay Receiver

            Go to System PreferencesSharingUntick Airplay Receiver.

            See more details

            You should be able to rerun the server now on port 5000 and get a response:

            Source https://stackoverflow.com/questions/69818376


            SQLAlchemy - Adding a ForeignKeyConstraint to a many-to-many table that is based on another relationship
            Asked 2021-Oct-11 at 01:42

            Forgive me if this has been answered elsewhere. I've been searching SO and haven't been able to translate the seemingly relevant Q&As to my scenerio.

            I'm working on a fun personal project where I have 4 main schemas (barring relationships for now):

            • Persona (name, bio)
            • Episode (title, plot)
            • Clip (url, timestamp)
            • Image (url)

            Restrictions (Basis of Relationships):

            1. A Persona can show up in multiple episodes, as well as multiple clips and images from those episodes (but might not be in all clips/images related to an episode).
            2. An Episode can contain multiple personas, clips, and images.
            3. An Image/Clip can only be related to a single Episode, but can be related to multiple personas.
            4. If a Persona is already assigned to episode(s), then any clip/image assigned to the persona can only be from one of those episodes or (if new) must only be capable of having one of the episodes that the persona appeared in associated to the clip/image.
            5. If an Episode is already assigned persona(s), then any clip/image assigned to the episode must be related to aleast one of those personas or (if new) must only be capable of having one or more of the personas from the episode associated to the clip/image.

            I've designed the database structure like so:

            This generates the following sql:



            Answered 2021-Oct-05 at 23:19

            I can't think of any way to add this logic on the DB. Would it be acceptable to manage these constraints in your code? Like this:

            Event: a new image would be insterted in DB

            Source https://stackoverflow.com/questions/69418576


            Cloud Run Flask API container running shutit enters a sleep loop
            Asked 2021-Sep-30 at 14:13

            The issue has appeared recently and the previously healthy container now enters a sleep loop when a shutit session is being created. The issue occurs only on Cloud Run and not locally.

            Minimum reproducible code:




            Answered 2021-Sep-23 at 12:35

            It's not a perfect replacement but you can use one of the following instead:

            I'm not sure what's the big picture so I'll add various options

            For remote automation tasks from a flask web server we're using paramiko for its simplicity and quick setup, though you might prefer something like pyinfra for large projects or subprocess for small local tasks.

            1. Paramiko - a bit more hands-on\manual than shutit, run commands over the ssh protocol.


            Source https://stackoverflow.com/questions/69265924


            Create a database trigger in an event listener
            Asked 2021-Sep-22 at 17:53

            I have a flask API and I'm using Flask-SQLAlchemy to handle a SQLite database. I have a table which stores log entries, and I want to limit the maximum number of rows to a number n. Since insertions are also made from another script outside of flask using raw SQL, I created a trigger that checks the number of rows and deletes the oldest ones if the number is higher than n:



            Answered 2021-Sep-19 at 17:01

            You don't need to create a DDL instance, you can execute the SQL within the listener function. The relevant docs are here.

            Source https://stackoverflow.com/questions/68952710

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network


            No vulnerabilities reported

            Install flask

            You can install using 'pip install flask' or download it from GitHub, PyPI.
            You can use flask like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.


            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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