Flask example

Simple flask app

# Extremely simple flask application, will display 'Hello World!' on the screen when you run it
# Access it by running it, then going to whatever port its running on (It'll say which port it's running on).
from flask import Flask
app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hello, World!'

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

Source: flask.palletsprojects.com

Flask tutorial

from flask import Flask
app = Flask(__name__)

@app.route('/')
def hello_world():
   return 'Hello World’

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

Source: tutorialspoint.com

Flask how to run app

$ export FLASK_APP=hello.py
$ python -m flask run
 * Running on http://127.0.0.1:5000/

Source: flask.palletsprojects.com

Flask example

from flask import Flask
app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hello, World!'

Source: flask.palletsprojects.com

Basic flask app python

#Import Flask, if not then install and import.

import os
try:
  from flask import *
except:
  os.system("pip3 install flask")
  from flask import *

app = Flask(__name__)

@app.route("/")
def index():
  return "<h1>Hello World</h1>"

if __name__ == "__main__":
  app.run(host="0.0.0.0", port=8080, debug=False)

Flask form

class PostForm(FlaskForm): 
    title = StringField('Title', validators=[DataRequired()]) 
    content = TextAreaField('Content', validators=[DataRequired()]) 
                      validators=[DataRequired(), Length(min=2, max=50)])
    submit = SubmitField('Post')

Similar codes

4 votes321 views2 answers
Is coumn exist then delete in datafrmae
Python
17 votes323 views3 answers
Python ModuleNotFoundError: No module named '_tkinter'
Python
0 vote314 views1 answer
Convert ascii to binary python
Python
0 vote371 views1 answer
Get element from string with deliminator python
Python
20 votes328 views1 answer
ParserError: Error tokenizing data. C error: Expected 1 fields in line 87, saw 2
Python
0 vote368 views1 answer
Python counter infinite series
Python
0 vote303 views1 answer
Scrapy csv output
Python
0 vote309 views1 answer
Mat.at(row,col) Opencv
Python
34 votes410 views2 answers
Dropping nan in pandas dataframe
Python
0 vote371 views1 answer
S = 1 + 2 + ... + n in python
Python