src/fnpb/ln/invoice.py
def to_csv(self) -> str:
        """Converts and returns the invoice data frame to a CSV formatted string.

        Returns:
            The invoice data frame as CSV formatted string.
        """
        return self._df.to_csv(index=False)
Converts and returns the invoice data frame to a CSV formatted string.

        Returns:
            The invoice data frame as CSV formatted string.
        
Converts and returns the invoice data frame to a CSV formatted string.
Converts and returns the invoice data frame to a CSV formatted string .
def to_csv(self) -> str:
        return self._df.to_csv(index=False)
def to_csv ( self ) -> str : return self . _df . to_csv ( index = False )
Converts and returns the invoice data frame to a CSV formatted string.
Converts and returns the invoice data frame to a CSV formatted string .
"""Converts and returns the invoice data frame to a CSV formatted string.

        Returns:
            The invoice data frame as CSV formatted string.
        """
The invoice data frame as CSV formatted string.
The invoice data frame as CSV formatted string .
self