Why do I get error Mapper mapped class Host->host could not assemble any primary key column even when I have column with primary key?

Why do I get this error saying: sqlalchemy.exc.ArgumentError: Mapper mapped class Host->host could not assemble any primary key columns for mapped table ‘host’. Even when I have a column with primary key. from sqlalchemy import Column, ForeignKey, Integer, String from sqlalchemy.ext.declarative import declarative_base from sqlalchemy import create_engine Base = declarative_base() class Host(Base): __tablename__ = ‘host’…

Error while installing Jupyter on Windows 10

I am getting the following error while Installing Jupyter through pip install jupyter Below is the error I am getting: ERROR: Command errored out with exit status 1: command: ‘c:\users\lenovo\appdata\local\programs\python\python38-32\python.exe’ -c ‘import sys, setuptools, tokenize; sys.argv[0] = ‘”‘”‘C:\\Users\\LENOVO\\AppData\\Local\\Temp\\pip-install-wxq2b1yw\\pywinpty\\setup.py'”‘”‘; __file__='”‘”‘C:\\Users\\LENOVO\\AppData\\Local\\Temp\\pip-install-wxq2b1yw\\pywinpty\\setup.py'”‘”‘;f=getattr(tokenize, ‘”‘”‘open'”‘”‘, open)(__file__);code=f.read().replace(‘”‘”‘\r\n'”‘”‘, ‘”‘”‘\n'”‘”‘);f.close();exec(compile(code, __file__, ‘”‘”‘exec'”‘”‘))’ egg_info –egg-base ‘C:\Users\LENOVO\AppData\Local\Temp\pip-install-wxq2b1yw\pywinpty\pip-egg-info’ cwd: C:\Users\LENOVO\AppData\Local\Temp\pip-install-wxq2b1yw\pywinpty\ Complete output (161 lines): Compiling C:\Users\LENOVO\AppData\Local\Temp\easy_install-019202gj\Cython-0.29.14\Cython\Plex\Scanners.py…

MFRC522 RFID Python3 Script won’t start: No such file or directory

I have the problem that the Python Scripts for the MFRC522 RFID-Reader won’t start. I couldn’t find any solution to this problem I tried following this tutorial: https://pimylifeup.com/raspberry-pi-rfid-rc522 when starting the script I get this error: pi@pi-d339203c:~/pi-rfid $ python3 Read.py Traceback (most recent call last): File “Read.py”, line 5, in <module> reader = SimpleMFRC522() File…

Django can not create test database using MySQL

I’m developing a large Django project and I’m beginning to write some tests. But I ran into a problem when running them. When I run python manage.py test I get the following error: $ project/ python manage.py test project/env/lib/python3.7/site-packages/django/db/models/base.py:319: RuntimeWarning: Model ‘accounts.manager’ was already registered. Reloading models is not advised as it can lead to…

i am trying to convert text to speech using pyttsx3 in python. but i am getting the error maybe on driverName

i am trying to convert text to speech using pyttsx3 in python. but i am getting the error maybe on driverName. Here is my code import pyttsx3 engine = pyttsx3.init() engine.say(“I will speak this text”) engine.runAndWait() Here is the Output which gives error. Python 3.8.0 (tags/v3.8.0:fa919fd, Oct 14 2019, 19:37:50) [MSC v.1916 64 bit (AMD64)]…