/usr/lib/python2.7/dist-packages/rows/table.py is in python-rows 0.3.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright 2014-2015 Álvaro Justen <https://github.com/turicas/rows/>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from __future__ import unicode_literals
from collections import MutableSequence, namedtuple, OrderedDict, Sized
from operator import itemgetter
import six
from rows.fields import identify_type
class Table(MutableSequence):
def __init__(self, fields, meta=None):
# TODO: should we really use OrderedDict here?
# TODO: should use slug on each field name automatically or inside each
# plugin?
self.fields = OrderedDict(fields)
# TODO: should be able to customize row return type (namedtuple, dict
# etc.)
self.Row = namedtuple('Row', self.field_names)
self._rows = []
self.meta = dict(meta) if meta is not None else {}
@property
def field_names(self):
return list(self.fields.keys())
@property
def field_types(self):
return list(self.fields.values())
def __repr__(self):
length = len(self._rows) if isinstance(self._rows, Sized) else '?'
imported = ''
if 'imported_from' in self.meta:
imported = ' (from {})'.format(self.meta['imported_from'])
return '<rows.Table{} {} fields, {} rows>'.format(imported,
len(self.fields),
length)
def _make_row(self, row):
# TODO: should be able to customize row type (namedtuple, dict etc.)
return [field_type.deserialize(row.get(field_name, None))
for field_name, field_type in self.fields.items()]
def append(self, row):
"""Add a row to the table. Should be a dict"""
self._rows.append(self._make_row(row))
def __len__(self):
return len(self._rows)
def __getitem__(self, key):
key_type = type(key)
if key_type == int:
return self.Row(*self._rows[key])
elif key_type == slice:
return [self.Row(*row) for row in self._rows[key]]
elif key_type is six.text_type:
try:
field_index = self.field_names.index(key)
except ValueError:
raise KeyError(key)
# TODO: should change the line below to return a generator exp?
return [row[field_index] for row in self._rows]
else:
raise ValueError('Unsupported key type: {}'
.format(type(key).__name__))
def __setitem__(self, key, value):
key_type = type(key)
if key_type == int:
self._rows[key] = self._make_row(value)
elif key_type is six.text_type:
values = list(value) # I'm not lazy, sorry
if len(values) != len(self):
raise ValueError('Values length ({}) should be the same as '
'Table length ({})'
.format(len(values), len(self)))
from rows.fields import detect_types
from rows.plugins.utils import slug
field_name = slug(key)
is_new_field = field_name not in self.field_names
field_type = detect_types([field_name],
[[value] for value in values])[field_name]
self.fields[field_name] = field_type
self.Row = namedtuple('Row', self.field_names)
if is_new_field:
for row, value in zip(self._rows, values):
row.append(field_type.deserialize(value))
else:
field_index = self.field_names.index(field_name)
for row, value in zip(self._rows, values):
row[field_index] = field_type.deserialize(value)
else:
raise ValueError('Unsupported key type: {}'
.format(type(key).__name__))
def __delitem__(self, key):
key_type = type(key)
if key_type == int:
del self._rows[key]
elif key_type is six.text_type:
try:
field_index = self.field_names.index(key)
except ValueError:
raise KeyError(key)
del self.fields[key]
self.Row = namedtuple('Row', self.field_names)
for row in self._rows:
row.pop(field_index)
else:
raise ValueError('Unsupported key type: {}'
.format(type(key).__name__))
def insert(self, index, row):
self._rows.insert(index, self._make_row(row))
def __radd__(self, other):
if other == 0:
return self
raise ValueError()
# TODO: fix "table += other"
def __add__(self, other):
if other == 0:
return self
if not isinstance(self, type(other)) or self.fields != other.fields:
raise ValueError('Tables have incompatible fields')
table = Table(fields=self.fields)
table._rows = self._rows + other._rows
return table
def order_by(self, key):
# TODO: implement locale
# TODO: implement for more than one key
reverse = False
if key.startswith('-'):
key = key[1:]
reverse = True
field_names = self.field_names
if key not in field_names:
raise ValueError('Field "{}" does not exist'.format(key))
key_index = field_names.index(key)
self._rows.sort(key=itemgetter(key_index), reverse=reverse)
class FlexibleTable(Table):
def __init__(self, fields=None, meta=None):
if fields is None:
fields = {}
super(FlexibleTable, self).__init__(fields, meta)
def __getitem__(self, key):
if isinstance(key, int):
return self.Row(**self._rows[key])
elif isinstance(key, slice):
return [self.Row(**row) for row in self._rows[key]]
else:
raise ValueError('Unsupported key type: {}'
.format(type(key).__name__))
def _add_field(self, field_name, field_type):
self.fields[field_name] = field_type
self.Row = namedtuple('Row', self.field_names)
def _make_row(self, row):
for field_name in row.keys():
if field_name not in self.field_names:
self._add_field(field_name, identify_type(row[field_name]))
return {field_name: field_type.deserialize(row.get(field_name, None))
for field_name, field_type in self.fields.items()}
def insert(self, index, row):
self._rows.insert(index, self._make_row(row))
def __setitem__(self, key, value):
self._rows[key] = self._make_row(value)
def append(self, row):
"""Add a row to the table. Should be a dict"""
self._rows.append(self._make_row(row))
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