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from __future__ import absolute_import, print_function, division
import pytest
from petl.errors import FieldSelectionError
from petl.test.helpers import ieq, eq_
from petl.comparison import Comparable
from petl.transform.selects import select, selectin, selectcontains, \
rowlenselect, selectusingcontext, facet, selectgt, selectlt
def test_select():
table = (('foo', 'bar', 'baz'),
('a', 4, 9.3),
('a', 2, 88.2),
('b', 1, 23.3),
('c', 8, 42.0),
('d', 7, 100.9),
('c', 2))
actual = select(table, lambda rec: rec[0] == 'a')
expect = (('foo', 'bar', 'baz'),
('a', 4, 9.3),
('a', 2, 88.2))
ieq(expect, actual)
ieq(expect, actual) # check can iterate twice
table = (('foo', 'bar', 'baz'),
('a', 4, 9.3),
('a', 2, 88.2),
('b', 1, 23.3),
('c', 8, 42.0),
('d', 7, 100.9),
('c', 2))
actual = select(table, lambda rec: rec['foo'] == 'a')
expect = (('foo', 'bar', 'baz'),
('a', 4, 9.3),
('a', 2, 88.2))
ieq(expect, actual)
ieq(expect, actual) # check can iterate twice
table = (('foo', 'bar', 'baz'),
('a', 4, 9.3),
('a', 2, 88.2),
('b', 1, 23.3),
('c', 8, 42.0),
('d', 7, 100.9),
('c', 2))
actual = select(table, lambda rec: rec.foo == 'a')
expect = (('foo', 'bar', 'baz'),
('a', 4, 9.3),
('a', 2, 88.2))
ieq(expect, actual)
ieq(expect, actual) # check can iterate twice
# check select complement
actual = select(table, lambda rec: rec['foo'] == 'a', complement=True)
expect = (('foo', 'bar', 'baz'),
('b', 1, 23.3),
('c', 8, 42.0),
('d', 7, 100.9),
('c', 2))
ieq(expect, actual)
ieq(expect, actual) # check can iterate twice
actual = select(table, lambda rec: rec['foo'] == 'a' and rec['bar'] > 3)
expect = (('foo', 'bar', 'baz'),
('a', 4, 9.3))
ieq(expect, actual)
actual = select(table, "{foo} == 'a'")
expect = (('foo', 'bar', 'baz'),
('a', 4, 9.3),
('a', 2, 88.2))
ieq(expect, actual)
actual = select(table, "{foo} == 'a' and {bar} > 3")
expect = (('foo', 'bar', 'baz'),
('a', 4, 9.3))
ieq(expect, actual)
# check error handling on short rows
actual = select(table, lambda rec: Comparable(rec['baz']) > 88.1)
expect = (('foo', 'bar', 'baz'),
('a', 2, 88.2),
('d', 7, 100.9))
ieq(expect, actual)
# check single field tests
actual = select(table, 'foo', lambda v: v == 'a')
expect = (('foo', 'bar', 'baz'),
('a', 4, 9.3),
('a', 2, 88.2))
ieq(expect, actual)
ieq(expect, actual) # check can iterate twice
# check select complement
actual = select(table, 'foo', lambda v: v == 'a', complement=True)
expect = (('foo', 'bar', 'baz'),
('b', 1, 23.3),
('c', 8, 42.0),
('d', 7, 100.9),
('c', 2))
ieq(expect, actual)
ieq(expect, actual) # check can iterate twice
def test_select_empty():
table = (('foo', 'bar'),)
expect = (('foo', 'bar'),)
actual = select(table, lambda r: r['foo'] == r['bar'])
ieq(expect, actual)
def test_rowselect_headerless():
table = []
expect = []
actual = select(table, 'True')
ieq(expect, actual)
def test_fieldselect_headerless():
table = []
with pytest.raises(FieldSelectionError):
for i in select(table, 'foo', lambda v: v == 'a'):
pass
def test_select_falsey():
table = (('foo',),
([],),
('',))
expect = (('foo',),)
actual = select(table, '{foo}')
ieq(expect, actual)
def test_selectgt():
table = (('foo', 'bar', 'baz'),
('a', 4, 9.3),
('a', 2, 88.2),
('b', 1, None),
('c', 8, 42.0),
('d', 7, 100.9),
('c', 2))
actual = selectgt(table, 'baz', 50)
expect = (('foo', 'bar', 'baz'),
('a', 2, 88.2),
('d', 7, 100.9))
ieq(expect, actual)
ieq(expect, actual)
def test_selectlt():
table = (('foo', 'bar', 'baz'),
('a', 4, 9.3),
('a', 2, 88.2),
('b', 1, None),
('c', 8, 42.0),
('d', 7, 100.9),
('c', 2))
actual = selectlt(table, 'baz', 50)
expect = (('foo', 'bar', 'baz'),
('a', 4, 9.3),
('b', 1, None),
('c', 8, 42.0),
('c', 2))
ieq(expect, actual)
ieq(expect, actual)
def test_selectin():
table = (('foo', 'bar', 'baz'),
('a', 4, 9.3),
('a', 2, 88.2),
('b', 1, 23.3),
('c', 8, 42.0),
('d', 7, 100.9),
('c', 2))
actual = selectin(table, 'foo', ['a', 'x', 'y'])
expect = (('foo', 'bar', 'baz'),
('a', 4, 9.3),
('a', 2, 88.2))
ieq(expect, actual)
ieq(expect, actual) # check can iterate twice
def test_selectcontains():
table = (('foo', 'bar', 'baz'),
('aaa', 4, 9.3),
('aa', 2, 88.2),
('bab', 1, 23.3),
('c', 8, 42.0),
('d', 7, 100.9),
('c', 2))
actual = selectcontains(table, 'foo', 'a')
expect = (('foo', 'bar', 'baz'),
('aaa', 4, 9.3),
('aa', 2, 88.2),
('bab', 1, 23.3))
ieq(expect, actual)
ieq(expect, actual) # check can iterate twice
def test_rowselect():
table = (('foo', 'bar', 'baz'),
('a', 4, 9.3),
('a', 2, 88.2),
('b', 1, 23.3),
('c', 8, 42.0),
('d', 7, 100.9),
('c', 2))
actual = select(table, lambda row: row[0] == 'a')
expect = (('foo', 'bar', 'baz'),
('a', 4, 9.3),
('a', 2, 88.2))
ieq(expect, actual)
ieq(expect, actual) # check can iterate twice
def test_rowlenselect():
table = (('foo', 'bar', 'baz'),
('a', 4, 9.3),
('a', 2, 88.2),
('b', 1, 23.3),
('c', 8, 42.0),
('d', 7, 100.9),
('c', 2))
actual = rowlenselect(table, 3)
expect = (('foo', 'bar', 'baz'),
('a', 4, 9.3),
('a', 2, 88.2),
('b', 1, 23.3),
('c', 8, 42.0),
('d', 7, 100.9))
ieq(expect, actual)
ieq(expect, actual) # check can iterate twice
def test_recordselect():
table = (('foo', 'bar', 'baz'),
('a', 4, 9.3),
('a', 2, 88.2),
('b', 1, 23.3),
('c', 8, 42.0),
('d', 7, 100.9),
('c', 2))
actual = select(table, lambda rec: rec['foo'] == 'a')
expect = (('foo', 'bar', 'baz'),
('a', 4, 9.3),
('a', 2, 88.2))
ieq(expect, actual)
ieq(expect, actual) # check can iterate twice
def test_selectusingcontext():
table1 = (('foo', 'bar'),
('A', 1),
('B', 4),
('C', 5),
('D', 9))
expect = (('foo', 'bar'),
('B', 4),
('C', 5))
def query(prv, cur, nxt):
return ((prv is not None and (cur.bar - prv.bar) < 2)
or (nxt is not None and (nxt.bar - cur.bar) < 2))
actual = selectusingcontext(table1, query)
ieq(expect, actual)
ieq(expect, actual)
def test_facet():
table = (('foo', 'bar', 'baz'),
('a', 4, 9.3),
('a', 2, 88.2),
('b', 1, 23.3),
('c', 8, 42.0),
('d', 7, 100.9),
('c', 2))
fct = facet(table, 'foo')
assert set(fct.keys()) == {'a', 'b', 'c', 'd'}
expect_fcta = (('foo', 'bar', 'baz'),
('a', 4, 9.3),
('a', 2, 88.2))
ieq(fct['a'], expect_fcta)
ieq(fct['a'], expect_fcta) # check can iterate twice
expect_fctc = (('foo', 'bar', 'baz'),
('c', 8, 42.0),
('c', 2))
ieq(fct['c'], expect_fctc)
ieq(fct['c'], expect_fctc) # check can iterate twice
def test_facet_2():
table = (('foo', 'bar', 'baz'),
('aa', 4, 9.3),
('aa', 2, 88.2),
('bb', 1, 23.3),
('cc', 8, 42.0),
('dd', 7, 100.9),
('cc', 2))
fct = facet(table, 'foo')
assert set(fct.keys()) == {'aa', 'bb', 'cc', 'dd'}
expect_fcta = (('foo', 'bar', 'baz'),
('aa', 4, 9.3),
('aa', 2, 88.2))
ieq(fct['aa'], expect_fcta)
ieq(fct['aa'], expect_fcta) # check can iterate twice
expect_fctc = (('foo', 'bar', 'baz'),
('cc', 8, 42.0),
('cc', 2))
ieq(fct['cc'], expect_fctc)
ieq(fct['cc'], expect_fctc) # check can iterate twice
def test_facet_empty():
table = (('foo', 'bar'),)
actual = facet(table, 'foo')
eq_(list(), list(actual.keys()))
def test_select_untrusted():
table = (('foo', 'bar', 'baz'),
('a', 4, 9.3),
('a', 2, 88.2),
('b', 1, 23.3),
('c', 8, 42.0),
('d', 7, 100.9),
('c', 2))
actual = select(table, "{foo} == 'a' and {bar} > 3", trusted=False)
expect = (('foo', 'bar', 'baz'),
('a', 4, 9.3))
ieq(expect, actual)
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