Whenever I am trying to visit 'http://127.0.0.1:5000/welcome' I am supposed to get 'Welcome to flask tuitorial' but I am getting 'The requested URL was not found on the server. If you entered the URL manually please check your spelling and try again.' if trying visit 'http://127.0.0.1:5000/', I am getting 'Hello World'. I didnt write any route method for that. That hello_world program I had done long back ago. Still why its coming I don't know. Today my project is different and my program as well different but still I am getting same o/p.
from flask import Flask
app = Flask(__name__)
#app.route('/welcome')
def hello_world():
return 'Welcome to flask tuitorial'
if __name__ == '__main__':
app.run(debug = True)
I am new to using Flask. I have written basic Flask code for Hello World but after updating function I am still seeing old value on the web page. From what I read on other posts and blogs, this might be Cache problem. But I am not sure how to clear it.
Old Function:
def hello_world():
print('Hello World')
New Function:
def hello_world():
print('Hello Hi')
I am still seeing Hello World as an output in the web page instead of Hello Hi.
I am running code in PyCharm 2018.2.5 if this helps
from flask import Flask
from flask_caching import Cache
app = Flask(__name__)
cache = Cache'(config={'CACHE_TYPE': 'simple'})
#app.route('/')
def hello_world():
print('Hello Hi')
if __name__ == '__main__':
cache.init_app(app)
with app.app_context():
cache.clear()
app.run(debug=True)
Thank you in advance.
I restarted machine. One more process was running API that is why even after making changes they were not reflected. I am still not sure which process. But it is working fine now.
Hey I ran the flask basic code as follows -
from flask import Flask
app = Flask(__name__)
#app.route('/')
def hello_world():
return 'Hello, World!'
Then I ran the server as stated in docs and it ran fine.
But now when i got 127.0.0.1:5000/ nothing happens. The browser keeps circling as if refreshing the page but doesn't route.
Its my first python/flask code so I am not sure what I am doing wrong.
EDIT- By docs I mean quickstart documentation of flask. I know its fine cz i get this -
Serving Flask app "hello"
* Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
Just added app.run() to the same code and executed which is working fine. Can you try it?
from flask import Flask
app = Flask(__name__)
#app.route('/')
def hello_world():
return 'Hello, World!'
app.run()
I'm assuming that you're using this Quickstart - A Minimal Application.
That said let's make some points clear:
When you said
I know its fine cz i get this - Serving Flask app "hello"
You do not use the extension .py, which can cause some problems if you have another file with the same name in this directory. So make sure your FLASK_APP variable is correct.
This should work for you, but if the problem persist enable the Debug Mode adding
FLASK_ENV=development to your environment variable and see which error appears for you.
Hoping this solve your problem.
I am a newbie in the flask development this is my first program in the flask but it shows me this error:
The requested URL was not found on the server. If you entered the URL
manually please check your spelling and try again.
& this is my code
from flask import Flask
app = Flask(__name__)
#app.route('/index')
def index():
return 'Hello World'
if __name__ == '__main__':
app.run(debug=True)
I think you should just go to http://localhost:5000/index or http://127.0.0.1:5000/index but if you want to make that page your code should be like that
from flask import Flask
app = Flask(__name__)
#app.route('/')
def index():
return 'Hello World'
if __name__ == '__main__':
app.run(debug=True)
change #app.route('/index') to #app.route('/') also you should check this http://flask.pocoo.org/docs/0.12/quickstart/#routing
You have to specify the route for index page as
#app.route('/')
If you give any other name to the template, you need to have to specify the name to the route.
For eg, if the template name is "home", then you have to give it as:
#app.route('/home')
I came across this question while having an almost similar problem. But in my case, the app.py would be executed, for the first time, then if i try to reload my localhost, maybe numerous times after making changes on my app.py the above cited error would be generated.
To solve this, i got a solution from this link: https://stackoverflow.com/a/44950213
Basically the last execution of python would continue running even after i updated my files and my console indicated a restart. So lets say you have made 3 changes while saving each change, then in the background you will have 3 instances of python.exe running. Depending on your OS, you will need to end these processes and re-execute your app.py.
So even if you use http://127.0.0.1:5000/index yet there are still instances of previous python.exe running, it may not execute
Note: this doesnt have to be the case all the time.
if you make the correct changes and it still doesn't work, I found out the hard way that the answer is to just save your file, and then run the program again.
I had the same problem. I created the home page which ran just fine:
#app.route('/')
def hello_world():
return 'Hello, World!'
But then when I tried making another page the next day:
#app.route('/bye/')
def bye():
return 'Bye!'
It gave me a 404 error.
So this is what I did to solve it:
Go to terminal ---> set FLASK_APP=youPythonfilename.py ------> flask run
After doing this the problem was solved. To avoid reloading everytime you need to set your debugger to ON.
if __name__ == '__name__':
app.run(debug=True)
After you have turned debugger ON by the above code, all you need to do is save the file everytime you make changes (windows - ctrl+s).
What I want to do is run a python script(has nothing to do with html) via a url and display the result in the browser. The output can be as simple as an addition answer.
Whatever research I am doing shows I need Apache, cgi, Flask etc.
What I wanted to know is, can I do the aforementioned without using Apache or anything like that. Can I only use Flask to do the above task?
You don't need Apache
from flask import Flask
app = Flask(__name__)
#app.route("/")
def hello():
return "Hello World"
if __name__ == "__main__":
app.run()
Run with:
python my_file.py
And check localhost:5000, you should see "Hello World"