How to preallocate a list in Python 3.4? -


i want create list of 100 elements. how do in python 3.4. tried following.

l = none * [100]

but got following error

typeerror: can't multiply sequence non-int of type 'nonetype'

it works in python 2.x not python 3.4.

i tried l = range[100], won't allow me modify elements afterwards.

you thinking of l = [none] * 100. ּּּּl = none * [100]ּ not valid in python 2.x nor python 3.x.


Comments

Post a Comment

Popular posts from this blog

php - Wordpress website dashboard page or post editor content is not showing but front end data is showing properly -

Image
recently have uploaded wordpress site onto server. have uploaded wordpress site in sub-folder under root folder ../root(domain root folder)/wordpress (where host wordpress folder). now problem content data in page or post in dashboard of wordpress admin panel not showing - see image. but data showing in front view - see image. if not browser cache issue , not issue happened tinymce editor during upgrade; try add config file: define('concatenate_scripts', false);
Read more

javascript - Twitter Bootstrap - how to add some more margin between tooltip popup and element -

Image
i have not tryed since can't understand space between tooltip , element made/added bootstrap, tooltip near element triggers tooltip event. i make tooltip opening little bit away element, add more margin tooltip , eleemnt mean. i understand how in css if possible , if possible make both right,left,top,bottom tooltips hope question clear. this how tooltips looks on app: and , how should looks after this default css tooltip on top : .tooltip.top { padding: 5px 0; margin-top: -3px; } you can override in own css : .tooltip.top { margin-top: -10px; } note code work work tooltip on top, you'll nedd adapt css 3 other orientations : .tooltip.top { margin-top: -10px; } .tooltip.right { margin-left: 10px; } .tooltip.bottom { margin-top: 10px; } .tooltip.left { margin-left: -10px; }
Read more

authentication - Mongodb revoke acccess to connect test database -

i have ec2 instance mongodb 3.2.0 installed. have user admin access. can connect user , perform operation remotely. 1 can connect database test remote if knows ip mongo 11.11.11.11. although not able make operations, want restrict access user credentials can connect server. first need create users , grant roles users, example: use admin db.createuser( { user: "myuseradmin", pwd: "abc123", roles: [ { role: "useradminanydatabase", db: "admin" } ] } ) then need start server --auth parameter mongod --auth more information here
Read more