dataframe_builders.py 文件源码

def build_dataframe(self):
        if not self.values.exists():
            return pd.DataFrame()

        # Am I really a programmer or just a lego assembler?
        # Pandas makes my life at least 20 times easier.
        df = pd.DataFrame.from_records(self.values, index=self.index_column)

        # make the columns and labels prettier
        if self.rename_columns:
            df = df.rename(columns=self.column_mapping)

        df.index.name = TIME_COLUMN_NAME
        try:
            df.index = df.index.tz_convert(self.user.pytz_timezone)
        except AttributeError:
            # if attribute-error means the index is just a regular Index and
            # that only dates (and not time) was passed
            df.index = pd.DatetimeIndex(df.index, tz=self.user.pytz_timezone)

        # cast it as numerics if possible, otherwise if we're dealing with strings, ignore
        df = df.apply(pd.to_numeric, errors='ignore')

        return df