I am new to using plotly and dash, and I’m in need of a bit of assistance. I’ve got an object-oriented database that I’ve built using ZODB, and I am wanting to build an app that allows me to visualize some of the data in my ZODB database.
When I attempt to do so, however, I get a “LockError” exception on my db object.
Here is my entire script:
#Fetch the database file, and open a connection to the database storage = ZODB.FileStorage.FileStorage("test.fs") db = ZODB.DB(storage) db_connection = db.open() db_root = db_connection.root app = dash.Dash(__name__) list_group = dbc.ListGroup( [ dbc.ListGroupItem("Active item", active=True), dbc.ListGroupItem("Item 2"), dbc.ListGroupItem("Item 3"), ] ) app.layout = html.Div(children=[ html.H1(children='Database Viewer'), list_group ]) app.run_server(debug=True)
The error I am receiving is:
Exception has occurred: LockError Couldn't lock 'test.fs.lock'
I’ve been able to successfully open the database and plot some data if I only use plotly express and not dash. For example, the following does work:
import plotly.express as px storage = ZODB.FileStorage.FileStorage("test.fs") db = ZODB.DB(storage) db_connection = db.open() db_root = db_connection.root #Imagine there is some code right here that does some data analysis.... fig = px.bar(df, x="x var", y="y var", color="another var", title="My title") fig.show()
Therefore, it seems to be something related to Dash. My development environment is Visual Studio Code, using Python 3.8.5 and Miniconda.
Thanks for any help you can provide!