Source code for gammapy.utils.table

# Licensed under a 3-clause BSD style license - see LICENSE.rst
"""Table helper utilities."""
from __future__ import absolute_import, division, print_function, unicode_literals
from collections import OrderedDict
from astropy.table import Table
from astropy.units import Quantity
from .units import standardise_unit

__all__ = [

[docs]def table_standardise_units_copy(table): """Standardise units for all columns in a table in a copy. Calls `~gammapy.utils.units.standardise_unit`. Parameters ---------- table : `~astropy.table.Table` Input table (won't be modified) Returns ------- table : `~astropy.table.Table` Copy of the input table with standardised column units """ # Note: we could add an `inplace` option (or variant of this function) # See table = Table(table) return table_standardise_units_inplace(table)
[docs]def table_standardise_units_inplace(table): """Standardise units for all columns in a table in place. """ for column in table.columns.values(): if column.unit: column.unit = standardise_unit(column.unit) return table
[docs]def table_row_to_dict(row, make_quantity=True): """Make one source data dict. Parameters ---------- row : `~astropy.table.Row` Row make_quantity : bool Make quantity values for columns with units Returns ------- data : `~collections.OrderedDict` Row data """ data = OrderedDict() for name, col in row.columns.items(): val = row[name] if make_quantity and col.unit: val = Quantity(val, unit=col.unit) data[name] = val return data
[docs]def table_from_row_data(rows, **kwargs): """Helper function to create table objects from row data. - Works with quantities. - Preserves order of keys if OrderedDicts are used. Parameters ---------- rows : list List of row data (each row a dict or OrderedDict) """ table = Table(**kwargs) colnames = list(rows[0].keys()) for name in colnames: coldata = [_[name] for _ in rows] if isinstance(rows[0][name], Quantity): coldata = Quantity(coldata, unit=rows[0][name].unit) table[name] = coldata return table