#PYTHON errors are returned by Python in Excel formulas when a formula can't run properly. See below for specific cases.
External error
An error occurred in an external calculation service.
Initialization error
There is an issue with the Python initialization settings. Open the initialization settings task pane to resolve the error. For more information, see Python in Excel initialization settings.
Network calls are unsupported
Python in Excel supports importing data from an Excel worksheet or a Power Query data source.
To protect your security, common external data functions in Python, such as pandas.read_csv and pandas.read_excel, aren't compatible with Python in Excel. To import external data, use the Get & Transform feature in Excel to access Power Query. For more information, see Use Power Query to import data for Python in Excel.
Power Query error
An error was returned by the Python interpreter as a result of running the Python code.
Python execution error
We were unable to execute your Python code. Please check the Python formula for errors and try again.
Service error
Something went wrong with the service. Please try again.