I am trying to create a an application using Flask. I have done this before successfully, however, I am not sure why this is not working this time. Everything seems to be in the right order. I have searched for answers, however, I still can't determine what's going wrong as everything seems logical to me? Yet, it is still going wrong?
ZXM934/
app/
__innit__.py
views.py
venv/
run.py
The following are each files contents:
run.py
# Importing app object which was created in __innit__.py file into app.py
from app import app
if __name__ == "__main__":
app.run()
__innit__.py
# This class will ultimately bring our entire application together.
from flask import Flask
# Creating Flask app.
app = Flask(__name__)
# Importing views file to avoid circular import.
from app import views
view.py
# This class represents the UI of our website.
# Importing app directory. As __innit__.py file is apart of this directory,
# this import treats it as a package.
from app import app
#app.route("/")
def public_home():
return "Homepage"
#app.route("/login")
def login():
return "<h1 style='color: red'>Login</h1>"
I set the environment variables as following within the console:
export FLASK_APP=run.py
export FLASK_ENV=development
I then run the following command:
flask run
The following error occurs:
flask.cli.NoAppException: While importing "run", an ImportError was raised:
Traceback (most recent call last):
File "/Users/zahidmalik-ramzan/Desktop/zxm934/venv/lib/python3.7/site-packages/flask/cli.py", line 240, in locate_app
__import__(module_name)
File "/Users/zahidmalik-ramzan/Desktop/zxm934/run.py", line 2, in <module>
from app import app
ImportError: cannot import name 'app' from 'app' (unknown location)
I don't understand what I am doing wrong?
Your problem is in the file name __innit__.py.
For python to understand that a folder is an actual package within your project structure you need a special file inside, i.e. __init.py__ ps: no double n.
A regular package is typically implemented as a directory containing an __init__.py file. When a regular package is imported, this __init__.py file is implicitly executed, and the objects it defines are bound to names in the package’s namespace.
Conclusion: change your __innit.py__ to __init.py__
Related
I've got a module named: validators.py located at ./project/app1/validators.py.
To use it, I have imported it inside one of my Models:
# app1/models.py
from .validators import validate_something
After a while, I decide to move this validators.py to a separated directory utils/ (which contains a __init__.py file), so I can use it in all my apps without referencing the app1.
Now it's located at: ./project/utils/validators.py.
After moving the module, I changed my import at the beginning of the Model:
# app1/models.py
from utils.validators import validate_something
Now that I want to create new migrations using manage.py makemigrations I'm getting this error:
File "project/app1/migrations/0001_initial.py", line 5, in <module>
import app1.validators
ModuleNotFoundError: No module named 'app1.validators'
I can remove all migrations and regenerate them but I guess there should be another way to resolve this dependency issue.
So I'm following a beginners tutorial on Flask and for whatever reason am getting an error on what is essentially the very first step.
I first created an "app" directory where I created a python file for "init.py" which contains the following code:
from flask import Flask
app = Flask(__name__)
from app import routes
I then created a "routes.py" python file in the same directory:
from app import app
#app.route('/')
#app.route('/index')
def index():
return "Hello, World!"
Finally (and this is where the problem stems from), I created a python file named "microblog.py" which is located in the same folder as the "app" directory:
from app import app
I then go to my virtual environment and run (using cmd windows):
set FLASK_APP=microblog.py
So far so good, however when I try to run the following code in cmd:
flask run
I get the following error:
ImportError: cannot import name 'app' from 'app' (C:\Users\Grae_\microblog\app\__init__.py)
If any further clarification is needed, here are my file locations:
C:\Users\Grae_\microblog
C:\Users\Grae_\microblog\app
C:\Users\Grae_\microblog\__init__.py
C:\Users\Grae_\microblog\routes.py
C:\Users\Grae_\microblog\venv
C:\Users\Grae_\microblog\microblog.py
Apologies if this is really obvious, I'm just obviously very new to Flask and have been stuck on this for a while.
Thanks
The issue here is on python package "app". The directory should have a file named __init__.py instead of init.py.
For example, you rename the file init.py to __init__.py and replace content with below code it should work
from flask import Flask
app = Flask(__name__)
def start():
from app import routes
start()
You can do something like this:-
test.py
from flask import Flask
app = Flask(__name__)
#app.route("/")
def index():
return "Index!"
#app.route("/hello")
def hello():
return "Hello World!"
#app.route("/members")
def members():
return "Members"
#app.route("/members/<string:name>/")
def getMember(name):
return name</string:name>
if __name__ == "__main__":
app.run()
In command prompt, run the command-
python test.py
Try the URLs in your browser:
http://127.0.0.1:5000/
http://127.0.0.1:5000/hello
http://127.0.0.1:5000/members
http://127.0.0.1:5000/members/Karan/
My flask app runs fine.
But, when I split it up into 3 parts, the imported one displays a 404.
Here is the file structure:
myproject/
run.py
appy/
__init__.py
index.py
.
#run.py
from appy import app
if __name__ == '__main__
app.run()
.
#__init.py
from flask import Flask
app = Flask('appy')
from appy import index
#app.route("/h")
def hello():
return "Hello"
.
#index.py
from appy import app
#app.route("/s")
def shello():
return "Shello"
localhost/h runs fine returning Hello.
localhost/s gives 404.
Also, everything runs fine when merged into a single file.
Please suggest a way to do it correctly.
You're running into a circular import error. You are importing app into index.py but you are also importing index.py into __init__.py.
If you want to have everything in a different file the best way to do it is make your init.py file empty, and create a differently named file for the contents of index.py
Then from your new "init.py" file (with a new name) import the contents of index, and then run the app.
Should work now.
I'm in the beginning stages of a Flask application. The problems I'm having is that whenever I attempt to run the application I get:
app/application/___init___.py, line 11 in <module>
from user_auth.views import auth
ImportError: No module named user_auth.views
I have no idea what the problem is. The import for the home.view did this as well, then it stopped and worked fine on the local server. Been trying to figure this out for the longest, there aren't that many moving parts in the application as of yet, so not sure why this is happeninng. File structure and code below:
|app
|-application
|--__ init __.py
|--home
|--user_auth
|----forms.py
|----views.py
|----templates
|----static
My application/__ init __.py file:
from flask import Flask
app = Flask(__name__)
app.config.from_object('_config')
from home.views import home
from user_auth.views import auth
app.register_blueprint(home)
app.register_blueprint(auth)
My application/user_auth/views.py
from flask import Blueprint
auth = Blueprint('auth', __name__,
url_prefix='/user_auth',
template_folder='templates',
static_folder='static')
You're missing an __init__.py file under ./user_auth/ to make user_auth a module.
There's more information about modules in the docs.
(Updating my question with more information.)
My django app is running fine on my dev server.
I have a view that pulls from the database using the below line that works fine:
from myapp.models import MyTable
However, if I add the above 'from/import' to another module (see below structure, it's the module named 'problem_module.py') I'm writing where I want to pull from the sqlite3 database, I get this error.
raise ImportError("Could not import settings '%s' (Is it on sys.path?): %s" % (self.SETTINGS_MODULE, e))
ImportError: Could not import settings 'myfolder.settings' (Is it on sys.path?): No module named myfolder.settings
I've read and tried various solutions recommended when people get this error, but I missing something because i'm unable to resolve it.
I'm using Django 1.4 and have the lay-out as recommended.
mysite/
manage.py
mysite/
__init__.py
settings.py
urls.py
wsgi.py
myapp/
__init__.py
models.py
admin.py
views.py
indevelopment/
__init__.py
problem_module.py
I figured out what was happening and why after going through the traceback carefully and looking at the django source code. Here is what happens.
When you run:
python manage.py runserver
the environment variable gets set properly assuming you already changed this small little file or just don't pay attention to it because django 1.4 automatically configures it for you.
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "myapp.settings")
However, because this setting of os.environ is under a:
if __name__ = "__main__"
expression, it only gets run if call that file directly, as you do with:
python manage.py runserver
Otherwise, if you are running a file that needs that environment variable - say testing a module in Eclipse - , the os.environ needs to get set in another place (shell, etc).
All the that I got generally pointed to this but I needed the context.
But as a little adjustment (yes, not a good idea as it couples) on the source code you can also hardcode it in manually in/django/conf/__init__.py
Specifically to see where it happens, the change below works:
# in module: /django/conf/__init__.py
class LazySettings(LazyObject):
def _setup(self):
try:
# Comment out the call to os.environ and hardcode in your app settings
# settings_module = os.environ[ENVIRONMENT_VARIABLE]
# WARNING: bad practice to do this. ;.
settings_module = "myapp.settings"
Have you changed/set DJANGO_SETTINGS_MODULE?
Try export DJANGO_SETTINGS_MODULE=mysite.settings and start your dev server.
modify your manage.py:
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "mysite.settings")
PyCharm sometimes override DJANGO_SETTINGS_MODULE to empty string. Try to debug your manage.py and see if it realy changes after setdefault() call.
If its not either change pycharm settings or use os.environ['DJANGO....']='my_settings'..
or hack files at .idea/. .idea/workspaed.xml contains
env name="DJANGO_SETTINGS_MODULE" value="" in this case