There are several ways to set configuration:

app = Flask(__name__)
# Using app.config
app.config['DEBUG'] = True
# Just debug (and few more) allow to configure like this:
app.debug = True
# Updating multiple
app.config.update(
    DEBUG=True,
    SECRET_KEY='...'
)
# From a file
app.config.from_object('yourapplication.default_settings')
# From an environment var: 
# $ export YOURAPPLICATION_SETTINGS=/path/to/settings.cfg
# $ python run-app.py
app.config.from_envvar('YOURAPPLICATION_SETTINGS')

It would be a config file:

# Example configuration
DEBUG = False
SECRET_KEY = '?\xbf,\xb4\x8d\xa3"<\x9c\xb0@\x0f5\xab,w\xee\x8d$0\x13\x8b83'

You can use a default config that is always loaded and part of the version control, and a separate configuration that overrides the values as necessary as mentioned in the example above:

app = Flask(__name__)
app.config.from_object('yourapplication.default_settings')
app.config.from_envvar('YOURAPPLICATION_SETTINGS')

If you do not want an error when load the config:

app.config.from_envvar('PERSONAL_WEBPAGE_SETTINGS', silent=True)

Another pattern is to use a class:

class Config(object):
    DEBUG = False
    TESTING = False
    DATABASE_URI = 'sqlite://:memory:'
 
class ProductionConfig(Config):
    DATABASE_URI = 'mysql://user@localhost/foo'
 
class DevelopmentConfig(Config):
    DEBUG = True
 
class TestingConfig(Config):
    TESTING = True
 
# To enable such a config you just have to call into from_object():
app.config.from_object('configmodule.ProductionConfig')

When you locate the static files (js, css…) in static/ folder you can automatically access them like <img src='/static/images/logo.png'>.
However you can change it providing a parameter static_folder to the application object, even changing the path with static_url_path parameter:

app = Flask(__name__, static_folder='/path/to/static/folder', static_url_path='/differentstatic')

Then: <img src='/differentstatic/logo.png'>

You can create an external file views.py and add there all the logic:

from yourapplication import app
 
@app.route('/')
def index():
    return 'Hello World!'

Also you can create a global instance of your class and route your rules to it:

class X(object):
    # Your code here
 
INSTANCE_X = X()
 
# Note that we are not *calling* the methods
app.add_url_rule('/x/', view_func=INSTANCE_X.route1)
app.add_url_rule('/y/', view_func=INSTANCE_X.route2)

You can use view_func:

def handle_route2():
    return X().route2()
 
app.add_url_rule('/y/', view_func=handle_route2)

• To enable debug mode you should add app.debug = True.

@app.route('/')
def root():
    register_ip(request.remote_addr)
    return redirect(url_for('static', filename='resume.html'))

url_for(folder, file) will return the url for that file in that folder.