Unanswered Questions

2,140 questions with no upvoted or accepted answers
5
votes
0answers
752 views

cs50w project1 - AttributeError: 'NoneType' object has no attribute '_instantiate_plugins'

I am trying to import the books.csv file into the online PostgreSQL database via Python code, as shown in the lectures and I get this error message when sqlalchemy is attempting to create the engine. ...
5
votes
1answer
2k views

How to install and compile the Stanford Portable Library on windows?

Self-explonatory title, I can't install the appliance for some reasons - Google just left me pretty confused - I would like to use the Stanford Portable Libray in a windows enviroment. I am using ...
4
votes
3answers
1k views

CS50 Finance/pset8 2019 /check

I am trying to write the script for a form such that if a username is taken, the user is alerted that it is taken, and submission of the form is blocked. If the username then types in the correct ...
3
votes
1answer
766 views

PSET 2 - Can Crack be implemented for 5 characters in a more efficient way?

Okay, so I've finished the crack problem, and it runs, but since the pset2 now tells us the passwords can be upto 5 characters long, it takes about 48 minutes to get the password match for "zzzzz". ...
3
votes
1answer
59 views

Google Earth frame is displayed in front of javascript alerts

When I click start engine in the right rail of the application, an alert is displayed behind the Google Earth frame of the Harvard Yard. I cannot click on any items that are displayed on this alert, ...
3
votes
0answers
160 views

Functions returning a value?

I'm trying to implement multi-dimensional arrays in Scratch, for an implementation of maze generation. To simplify, I'd like to implement a couple of custom blocks which return a value, e.g. ...
2
votes
0answers
60 views

OSError: [Errno 99] Cannot assign requested address in pset7 2019

I am trying to send email via my server to the persons who have done their registration. Their information is getting stored in database( csv file) but when I click on submit button, nothing loads and ...
2
votes
1answer
128 views

Compiler Can't locate CS50 library locally

I'm trying to work on my C psets on my local machine in vscode. I've installed the cs50 library locally but am having trouble compiling. OS is osx 10.14.3 The error I'm receiving when compiling with ...
2
votes
1answer
40 views

Problem with running docker toolbox on windows

Please I need help. I've been searching all over the net and topics on how to run IDE offline on my windows 10, I've downloaded it but when I run it following the several instructions, I keep getting ...
2
votes
1answer
75 views

Why do cs50/2018/x/speller, cs50/2018/x/mashup show looks good but give 4 / 5 for style?

I have run update50 and I'm still not seeing any style errors but I'm still getting 95% and 4/5 for style?
2
votes
1answer
365 views

CS50's Web Programming with Python and JavaScript on edx project submission

On the following course on edx: CS50's Mobile App Development with React Native CS50's Web Programming with Python and JavaScript I have been trying to submit the project work but it is "Coming Soon!" ...
2
votes
1answer
187 views

CS50.io - python 3.6 breaks submit50

I just ran update50 before trying to submit my final project but after doing that and trying to run submit50 the new version of python seems to have broken from what I have seen researching the error ...
2
votes
0answers
755 views

How to call the usd function in the jinja template of quoted.html?

I want to display the cost of the share in Quote tab using the "usd" function defined in helpers.py. I've tried adding app.jinja_env.globals.update(usd=usd)in application.py and then calling the ...
2
votes
1answer
95 views

Who I can connect if my problem set 0 haven't been graded?

I have submitted 6 problem set from 0-5, but only the problem set 0 haven't been graded. Who should I contact to inform the ungraded problem set?
2
votes
2answers
83 views

Difficulty submitting PSET7 to be graded

My pset7 zip file is about 700kb, i click in "Add files..." button and select pset7.zip, next i click the "Start upload" button, the uploader appears to fill pretty fast as normal but it doesn't ...

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