OSError: 'NAUTILUS_PATH' environment variable is not set.

[evgrmn]

Hello,
I'm trying to run the code from the faststart.ipynb file below:

import datetime
import os
import shutil
from decimal import Decimal

import fsspec
import pandas as pd

from nautilus_trader.backtest.node import BacktestNode
from nautilus_trader.backtest.node import BacktestVenueConfig
from nautilus_trader.backtest.node import BacktestDataConfig
from nautilus_trader.backtest.node import BacktestRunConfig
from nautilus_trader.backtest.node import BacktestEngineConfig
from nautilus_trader.config import ImportableStrategyConfig
from nautilus_trader.config import LoggingConfig
from nautilus_trader.core.datetime import dt_to_unix_nanos
from nautilus_trader.model.data import QuoteTick
from nautilus_trader.model.objects import Price, Quantity
from nautilus_trader.persistence.catalog import ParquetDataCatalog
from nautilus_trader.test_kit.providers import TestInstrumentProvider

from nautilus_trader.persistence.catalog import ParquetDataCatalog

# You can also use a relative path such as `ParquetDataCatalog("./catalog")`,
# for example if you're running this notebook after the data setup from the docs.
# catalog = ParquetDataCatalog("./catalog")
catalog = ParquetDataCatalog.from_env()
catalog.instruments()

but an error occurred:

Traceback (most recent call last):
File "/home/rmn/1/nuatilus/nautilus_trader/a.py", line 27, in
catalog = ParquetDataCatalog.from_env()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/rmn/1/nuatilus/nautilus_trader/nautilus_trader/persistence/catalog/parquet.py", line 172, in from_env
raise OSError(f"'{_NAUTILUS_PATH}' environment variable is not set.")
OSError: 'NAUTILUS_PATH' environment variable is not set.

Can anyone help me to avoide this error?

I use Linux Debian 11, Python 3.12.4

[cjdsellers]

Hi @evgrmn

You have two options here:

• Set the NAUTILUS_PATH environment variable to a path you're happy with to write data for the catalog
• Or, explicitly pass a path like the commented out code, e.g. ParquetDataCatalog("./catalog")

Hope that helps!

[evgrmn]

Thank you. It works.