The following code runs fine (in Jupyter notebook):
from flask import Flask
app = Flask(__name__)
#app.config["DEBUG"] = True
#app.route("/")
def hello():
return "Hello World!"
if __name__ == "__main__":
app.run()
uncommenting app.config["DEBUG"] = True and running results in error: Address in use. I tried changing port, but without any luck.
Update: I am on Windows 7
Related
I am trying to run a simple flask application in spyder(anaconda). But I am not getting expected results. Can anyone help me here?
from flask import Flask
app = Flask(__name__)
def return_val(a):
return a+1
#app.route('/')
def index():
return return_val(8)
if __name__ == "__main__":
app.run(port=8080)
I am expecting 9 to be printed on the application.
from flask import Flask, escape, request
app = Flask(__name__)
run_with_ngrok()
#app.route('/')
def hello():
name = request.args.get("name", "World")
return f'Hello, {escape(name)}!'
When I run the this from terminal with "flask run" it doesn't print an ngrok link.
Im i an virtual env and i have tried running it with python "file name" and it did not work.
if you are trying to expose your ip through ngrok, you can try tunneling with ngrok on terminal for the flask app's port
your app code should look like :
from flask import Flask, escape, request
app = Flask(__name__)
#app.route('/')
def hello():
name = request.args.get("name", "World")
return f'Hello, {escape(name)}!'
if __name__ == "__main__":
app.run(port=5000)
you can tunnel the flask app port with the following command:
ngrok http 5000
here the port 5000 denotes the flask app port.
I think you forgot to add this part to end of your file
if __name__ == "__main__":
app.run()
from flask_ngrok import run_with_ngrok
from flask import Flask, escape, request
app = Flask(__name__)
app.secret_key = '33d5f499c564155e5d2795f5b6f8c5f6'
run_with_ngrok(app)
#app.route('/')
def hello():
name = request.args.get("name", "World")
return f'Hello, {escape(name)}!'
if __name__ == "__main__":
app.run(debug=True)
We can grab token from ngrok.com website by signin
In terminal we need to run like
ngrok config add-authtoken <your_token>
ngrok http 5000
for flask it is 5000 and for other application it would be different
And we also need to run our application side by side
I'm new to flask, I'm trying to do a rest api, but when creating my route it doesn't recognize it for me.
I have imported flask and python 3.8.
from products import products
from flask import Flask
#app.route('/greeting')
def greeting():
return 'hi'
if __name__ == '__main__':
app.run(debug=True, port=4000)
You need to create the instance of the Flask class
app = Flask(__name__)
A minimal Flask application looks something like this:
from flask import Flask
app = Flask(__name__)
#app.route('/greeting')
def hello_world():
return 'Hello, World!'
if __name__ == '__main__':
app.run(debug=True, port=4000)
Now you could see it running at:
* Running on http://127.0.0.1:4000/
Access the greeting as http://127.0.0.1:4000/greeting
For more info read this
I made the following file yesterday.
# import flask
from flask import Flask
from flask import render_template
from flask import request
app = Flask(__name__)
# create url & function mapping for root or /
#app.route('/')
def index():
return "Hello from Flask"
# create another mapping name /hello
#app.route('/hello')
def hello():
myName = "kayak"
return "Hello again !!" + myName
# create mapping for /myprofile
#app.route('/myprofile')
def showmyprofile():
return render_template('myprofile.html')
# create mapping for /myprofile
#app.route('/addprofileform')
def addprofileform():
return render_template('myprofileform.html')
# create a mapping for /addprofile
#app.route('/addprofile')
def addprofile():
myname = request.args.get('myname')
state_of_residence = request.args.get('state_of_residence')
return render_template('myprofile.html', html_page_name=myname,
html_page_state_of_residence=state_of_residence)
if __name__== '__main__':
app.run()
Then I made the following file today.
from flask import Flask
app = Flask(__name__)
#app.route('/')
def index():
return 'This is the homepage'
if __name__ == "__main__":
app.run(debug=True)
I thought
app.run(debug=True)
would work to clear the old data, but I doesn't and http://127.0.0.1:5000/ page keeps showing "Hello from Flask".
How do I fix this?
Just clear the cache in your browser and try running it again.
Here's how to clear your cache in some browsers:
Firefix->https://support.mozilla.org/en-US/kb/how-clear-firefox-cache
Chrome->https://support.google.com/accounts/answer/32050?co=GENIE.Platform%3DDesktop&hl=en
You can export the FLASK_ENV environment variable and set it to development before running the server
export FLASK_ENV=development
flask run
This worked for me.
Running the program in incognito tab will not cause this error. No need to clear caches also. See https://support.google.com/chrome/answer/95464?co=GENIE.Platform%3DAndroid&hl=en
My files are as follows:
application.wsgi (NOTE: updated as recommended from my previous question here)
import os
import sys
sys.path.append('/srv/www/mysite.com/application')
os.environ['PYTHON_EGG_CACHE'] = '/srv/www/mysite.com/.python-egg'
import flaskr.helloworld
application = flaskr.helloworld.app
helloworld.py
from flask import Flask
app = Flask(__name__)
#app.route('/')
def __init__(self):
print 'Hello World!'
if __name__ == '__main__':
app.run()
For what ever reason I get the following error when attempting to load. Nothing is added to my error.log, it just displays this in the browser: "Internal Server Error"
Change print 'Hello World!' to return 'Hello World!'