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0

I downloaded a Flask project from GitHub. I'm trying to run the Flask project in a virtualenv, but when I run the project in virtualenv it's throwing the following error:

none
app__init__.py", line 10, in create_app
app.config.from_object(app_config[config_name])
KeyError: None

__init__.py:

from flask import Flask
from config import app_config
from flask_sqlalchemy import SQLAlchemy
from flask_migrate import Migrate

db = SQLAlchemy()

def create_app(config_name):
 app = Flask(__name__, instance_relative_config=True)
 app.config.from_object(app_config[config_name])
 app.config.from_pyfile('config.py')
 db.init_app(app)
 migrate = Migrate(app, db)
 from app import models 
 from app.home import home as home_blueprint
 app.register_blueprint(home_blueprint)
 return app

config.py:

 class Config(object):
 class DevelopmentConfig(Config):
 DEBUG = True
 SQLALCHEMY_ECHO = True
 class ProductionConfig(Config):
 DEBUG = False

 app_config = 
 'development': DevelopmentConfig,
 'production': ProductionConfig
 

run.py:

 import os
 from app import create_app
 config_name = os.getenv('FLASK_CONFIG')
 app = create_app(config_name)
 if __name__ == '__main__':
 app.run()

python flask virtualenv

share|improve this question

edited Mar 26 at 15:10

Nathan

2,78633 gold badges44 silver badges2323 bronze badges

asked Mar 26 at 13:08

user8624996

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is config_name None?
  
  – Ilja Everilä
  Mar 26 at 13:32
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Your question is missing a word at the end of the first sentence. Is the missing word "virtualenv"?
  
  – karel
  Mar 26 at 13:38
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @karel Yes, Thank you.
  
  – user8624996
  Mar 26 at 13:41
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Ilja Everilä I'll update my config.py code.
  
  – user8624996
  Mar 26 at 13:42
  

  
  
  
  

add a comment | 

0

I downloaded a Flask project from GitHub. I'm trying to run the Flask project in a virtualenv, but when I run the project in virtualenv it's throwing the following error:

none
app__init__.py", line 10, in create_app
app.config.from_object(app_config[config_name])
KeyError: None

__init__.py:

from flask import Flask
from config import app_config
from flask_sqlalchemy import SQLAlchemy
from flask_migrate import Migrate

db = SQLAlchemy()

def create_app(config_name):
 app = Flask(__name__, instance_relative_config=True)
 app.config.from_object(app_config[config_name])
 app.config.from_pyfile('config.py')
 db.init_app(app)
 migrate = Migrate(app, db)
 from app import models 
 from app.home import home as home_blueprint
 app.register_blueprint(home_blueprint)
 return app

config.py:

 class Config(object):
 class DevelopmentConfig(Config):
 DEBUG = True
 SQLALCHEMY_ECHO = True
 class ProductionConfig(Config):
 DEBUG = False

 app_config = 
 'development': DevelopmentConfig,
 'production': ProductionConfig
 

run.py:

 import os
 from app import create_app
 config_name = os.getenv('FLASK_CONFIG')
 app = create_app(config_name)
 if __name__ == '__main__':
 app.run()

python flask virtualenv

share|improve this question

edited Mar 26 at 15:10

Nathan

2,78633 gold badges44 silver badges2323 bronze badges

asked Mar 26 at 13:08

user8624996

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is config_name None?
  
  – Ilja Everilä
  Mar 26 at 13:32
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Your question is missing a word at the end of the first sentence. Is the missing word "virtualenv"?
  
  – karel
  Mar 26 at 13:38
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @karel Yes, Thank you.
  
  – user8624996
  Mar 26 at 13:41
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Ilja Everilä I'll update my config.py code.
  
  – user8624996
  Mar 26 at 13:42
  

  
  
  
  

add a comment | 

I downloaded a Flask project from GitHub. I'm trying to run the Flask project in a virtualenv, but when I run the project in virtualenv it's throwing the following error:

none
app__init__.py", line 10, in create_app
app.config.from_object(app_config[config_name])
KeyError: None

__init__.py:

from flask import Flask
from config import app_config
from flask_sqlalchemy import SQLAlchemy
from flask_migrate import Migrate

db = SQLAlchemy()

def create_app(config_name):
 app = Flask(__name__, instance_relative_config=True)
 app.config.from_object(app_config[config_name])
 app.config.from_pyfile('config.py')
 db.init_app(app)
 migrate = Migrate(app, db)
 from app import models 
 from app.home import home as home_blueprint
 app.register_blueprint(home_blueprint)
 return app

config.py:

 class Config(object):
 class DevelopmentConfig(Config):
 DEBUG = True
 SQLALCHEMY_ECHO = True
 class ProductionConfig(Config):
 DEBUG = False

 app_config = 
 'development': DevelopmentConfig,
 'production': ProductionConfig
 

run.py:

 import os
 from app import create_app
 config_name = os.getenv('FLASK_CONFIG')
 app = create_app(config_name)
 if __name__ == '__main__':
 app.run()

python flask virtualenv

share|improve this question

edited Mar 26 at 15:10

Nathan

2,78633 gold badges44 silver badges2323 bronze badges

asked Mar 26 at 13:08

user8624996

from flask import Flask
from config import app_config
from flask_sqlalchemy import SQLAlchemy
from flask_migrate import Migrate

db = SQLAlchemy()

def create_app(config_name):
 app = Flask(__name__, instance_relative_config=True)
 app.config.from_object(app_config[config_name])
 app.config.from_pyfile('config.py')
 db.init_app(app)
 migrate = Migrate(app, db)
 from app import models 
 from app.home import home as home_blueprint
 app.register_blueprint(home_blueprint)
 return app

 class Config(object):
 class DevelopmentConfig(Config):
 DEBUG = True
 SQLALCHEMY_ECHO = True
 class ProductionConfig(Config):
 DEBUG = False

 app_config = 
 'development': DevelopmentConfig,
 'production': ProductionConfig
 

 import os
 from app import create_app
 config_name = os.getenv('FLASK_CONFIG')
 app = create_app(config_name)
 if __name__ == '__main__':
 app.run()

share|improve this question

edited Mar 26 at 15:10

Nathan

2,78633 gold badges44 silver badges2323 bronze badges

asked Mar 26 at 13:08

user8624996

share|improve this question

edited Mar 26 at 15:10

Nathan

2,78633 gold badges44 silver badges2323 bronze badges

asked Mar 26 at 13:08

user8624996

edited Mar 26 at 15:10

Nathan

2,78633 gold badges44 silver badges2323 bronze badges

edited Mar 26 at 15:10

Nathan

2,78633 gold badges44 silver badges2323 bronze badges

1 Answer
1

active

oldest

votes

0

I think you forgot to set your FLASK_CONFIG environment variable before trying to run your Flask app. This will cause your environment configuration lookup to fail i.e. app_config[config_name] will be None since config_name isn't instantiated. Can you try setting up your environment variables before running? For example, open up your terminal and set your FLASK_CONFIG environment variable to development then try rerunning your application, something along the lines of:

 # Macintosh Users
 export FLASK_CONFIG=development
 export FLASK_APP=<start_file> # <start_file> is probably run.py for the template
 flask run

 # Window Users
 set FLASK_CONFIG=development
 set FLASK_APP=run.py
 flask run

Hopefully that helps, if this doesn't solve your issue can you please paste your file which starts your application? This file is probably run.py

share|improve this answer

edited Mar 26 at 15:44

answered Mar 26 at 14:17

NathanNathan

2,78633 gold badges44 silver badges2323 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you for your detailed explanation. I'm trying to setting the environment variable. I'll add the main file which is starting app.
  
  – user8624996
  Mar 26 at 14:24
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Ok so my explanation is the reason why, this line within run.py: config_name = os.getenv('FLASK_CONFIG') is looking for the environment variable FLASK_CONFIG so it can choose the appropriate configuration. Are you on a Macintosh?
  
  – Nathan
  Mar 26 at 15:04
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  No I'm using windows 10
  
  – user8624996
  Mar 26 at 15:08
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Ok can you try: set FLASK_CONFIG=development then: set FLASK_APP=run.py then: flask run For reference: flask.pocoo.org/docs/dev/cli and see if that works?
  
  – Nathan
  Mar 26 at 15:12
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yes, I'll try now asap. Thank you for providing the reference.
  
  – user8624996
  Mar 26 at 15:14
  

  
  
  
  

 | 
show 7 more comments

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0

I think you forgot to set your FLASK_CONFIG environment variable before trying to run your Flask app. This will cause your environment configuration lookup to fail i.e. app_config[config_name] will be None since config_name isn't instantiated. Can you try setting up your environment variables before running? For example, open up your terminal and set your FLASK_CONFIG environment variable to development then try rerunning your application, something along the lines of:

 # Macintosh Users
 export FLASK_CONFIG=development
 export FLASK_APP=<start_file> # <start_file> is probably run.py for the template
 flask run

 # Window Users
 set FLASK_CONFIG=development
 set FLASK_APP=run.py
 flask run

Hopefully that helps, if this doesn't solve your issue can you please paste your file which starts your application? This file is probably run.py

share|improve this answer

edited Mar 26 at 15:44

answered Mar 26 at 14:17

NathanNathan

2,78633 gold badges44 silver badges2323 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you for your detailed explanation. I'm trying to setting the environment variable. I'll add the main file which is starting app.
  
  – user8624996
  Mar 26 at 14:24
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Ok so my explanation is the reason why, this line within run.py: config_name = os.getenv('FLASK_CONFIG') is looking for the environment variable FLASK_CONFIG so it can choose the appropriate configuration. Are you on a Macintosh?
  
  – Nathan
  Mar 26 at 15:04
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  No I'm using windows 10
  
  – user8624996
  Mar 26 at 15:08
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Ok can you try: set FLASK_CONFIG=development then: set FLASK_APP=run.py then: flask run For reference: flask.pocoo.org/docs/dev/cli and see if that works?
  
  – Nathan
  Mar 26 at 15:12
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yes, I'll try now asap. Thank you for providing the reference.
  
  – user8624996
  Mar 26 at 15:14
  

  
  
  
  

 | 
show 7 more comments

0

I think you forgot to set your FLASK_CONFIG environment variable before trying to run your Flask app. This will cause your environment configuration lookup to fail i.e. app_config[config_name] will be None since config_name isn't instantiated. Can you try setting up your environment variables before running? For example, open up your terminal and set your FLASK_CONFIG environment variable to development then try rerunning your application, something along the lines of:

 # Macintosh Users
 export FLASK_CONFIG=development
 export FLASK_APP=<start_file> # <start_file> is probably run.py for the template
 flask run

 # Window Users
 set FLASK_CONFIG=development
 set FLASK_APP=run.py
 flask run

Hopefully that helps, if this doesn't solve your issue can you please paste your file which starts your application? This file is probably run.py

share|improve this answer

edited Mar 26 at 15:44

answered Mar 26 at 14:17

NathanNathan

2,78633 gold badges44 silver badges2323 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you for your detailed explanation. I'm trying to setting the environment variable. I'll add the main file which is starting app.
  
  – user8624996
  Mar 26 at 14:24
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Ok so my explanation is the reason why, this line within run.py: config_name = os.getenv('FLASK_CONFIG') is looking for the environment variable FLASK_CONFIG so it can choose the appropriate configuration. Are you on a Macintosh?
  
  – Nathan
  Mar 26 at 15:04
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  No I'm using windows 10
  
  – user8624996
  Mar 26 at 15:08
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Ok can you try: set FLASK_CONFIG=development then: set FLASK_APP=run.py then: flask run For reference: flask.pocoo.org/docs/dev/cli and see if that works?
  
  – Nathan
  Mar 26 at 15:12
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yes, I'll try now asap. Thank you for providing the reference.
  
  – user8624996
  Mar 26 at 15:14
  

  
  
  
  

 | 
show 7 more comments

I think you forgot to set your FLASK_CONFIG environment variable before trying to run your Flask app. This will cause your environment configuration lookup to fail i.e. app_config[config_name] will be None since config_name isn't instantiated. Can you try setting up your environment variables before running? For example, open up your terminal and set your FLASK_CONFIG environment variable to development then try rerunning your application, something along the lines of:

 # Macintosh Users
 export FLASK_CONFIG=development
 export FLASK_APP=<start_file> # <start_file> is probably run.py for the template
 flask run

 # Window Users
 set FLASK_CONFIG=development
 set FLASK_APP=run.py
 flask run

Hopefully that helps, if this doesn't solve your issue can you please paste your file which starts your application? This file is probably run.py

share|improve this answer

edited Mar 26 at 15:44

answered Mar 26 at 14:17

NathanNathan

2,78633 gold badges44 silver badges2323 bronze badges

 # Macintosh Users
 export FLASK_CONFIG=development
 export FLASK_APP=<start_file> # <start_file> is probably run.py for the template
 flask run

 # Window Users
 set FLASK_CONFIG=development
 set FLASK_APP=run.py
 flask run

share|improve this answer

edited Mar 26 at 15:44

answered Mar 26 at 14:17

NathanNathan

2,78633 gold badges44 silver badges2323 bronze badges

answered Mar 26 at 14:17

NathanNathan

2,78633 gold badges44 silver badges2323 bronze badges

answered Mar 26 at 14:17

NathanNathan

2,78633 gold badges44 silver badges2323 bronze badges