/
test_sorts.py
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/
test_sorts.py
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from __future__ import absolute_import, print_function, division
import os
import gc
import logging
from datetime import datetime
import platform
import pytest
from petl.compat import next
from petl.test.helpers import ieq, eq_
from petl.util import nrows
from petl.transform.basics import cat
from petl.transform.sorts import sort, mergesort, issorted
logger = logging.getLogger(__name__)
debug = logger.debug
def test_sort_1():
table = (('foo', 'bar'),
('C', '2'),
('A', '9'),
('A', '6'),
('F', '1'),
('D', '10'))
result = sort(table, 'foo')
expectation = (('foo', 'bar'),
('A', '9'),
('A', '6'),
('C', '2'),
('D', '10'),
('F', '1'))
ieq(expectation, result)
def test_sort_2():
table = (('foo', 'bar'),
('C', '2'),
('A', '9'),
('A', '6'),
('F', '1'),
('D', '10'))
result = sort(table, key=('foo', 'bar'))
expectation = (('foo', 'bar'),
('A', '6'),
('A', '9'),
('C', '2'),
('D', '10'),
('F', '1'))
ieq(expectation, result)
result = sort(table) # default is lexical sort
expectation = (('foo', 'bar'),
('A', '6'),
('A', '9'),
('C', '2'),
('D', '10'),
('F', '1'))
ieq(expectation, result)
def test_sort_3():
table = (('foo', 'bar'),
('C', '2'),
('A', '9'),
('A', '6'),
('F', '1'),
('D', '10'))
result = sort(table, 'bar')
expectation = (('foo', 'bar'),
('F', '1'),
('D', '10'),
('C', '2'),
('A', '6'),
('A', '9'))
ieq(expectation, result)
def test_sort_4():
table = (('foo', 'bar'),
('C', 2),
('A', 9),
('A', 6),
('F', 1),
('D', 10))
result = sort(table, 'bar')
expectation = (('foo', 'bar'),
('F', 1),
('C', 2),
('A', 6),
('A', 9),
('D', 10))
ieq(expectation, result)
def test_sort_5():
table = (('foo', 'bar'),
(2.3, 2),
(1.2, 9),
(2.3, 6),
(3.2, 1),
(1.2, 10))
expectation = (('foo', 'bar'),
(1.2, 9),
(1.2, 10),
(2.3, 2),
(2.3, 6),
(3.2, 1))
# can use either field names or indices (from 1) to specify sort key
result = sort(table, key=('foo', 'bar'))
ieq(expectation, result)
result = sort(table, key=(0, 1))
ieq(expectation, result)
result = sort(table, key=('foo', 1))
ieq(expectation, result)
result = sort(table, key=(0, 'bar'))
ieq(expectation, result)
def test_sort_6():
table = (('foo', 'bar'),
(2.3, 2),
(1.2, 9),
(2.3, 6),
(3.2, 1),
(1.2, 10))
expectation = (('foo', 'bar'),
(3.2, 1),
(2.3, 6),
(2.3, 2),
(1.2, 10),
(1.2, 9))
result = sort(table, key=('foo', 'bar'), reverse=True)
ieq(expectation, result)
def test_sort_buffered():
table = (('foo', 'bar'),
('C', 2),
('A', 9),
('A', 6),
('F', 1),
('D', 10))
# test sort forwards
expectation = (('foo', 'bar'),
('F', 1),
('C', 2),
('A', 6),
('A', 9),
('D', 10))
result = sort(table, 'bar')
ieq(expectation, result)
result = sort(table, 'bar', buffersize=2)
ieq(expectation, result)
# sort in reverse
expectation = (('foo', 'bar'),
('D', 10),
('A', 9),
('A', 6),
('C', 2),
('F', 1))
result = sort(table, 'bar', reverse=True)
ieq(expectation, result)
result = sort(table, 'bar', reverse=True, buffersize=2)
ieq(expectation, result)
# no key
expectation = (('foo', 'bar'),
('F', 1),
('D', 10),
('C', 2),
('A', 9),
('A', 6))
result = sort(table, reverse=True)
ieq(expectation, result)
result = sort(table, reverse=True, buffersize=2)
ieq(expectation, result)
def test_sort_buffered_tempdir():
table = (('foo', 'bar'),
('C', 2),
('A', 9),
('A', 6),
('F', 1),
('D', 10))
# test sort forwards
expectation = (('foo', 'bar'),
('F', 1),
('C', 2),
('A', 6),
('A', 9),
('D', 10))
result = sort(table, 'bar')
ieq(expectation, result)
tempdir = 'tmp'
if not os.path.exists(tempdir):
os.mkdir(tempdir)
result = sort(table, 'bar', buffersize=2, tempdir=tempdir)
ieq(expectation, result)
def test_sort_buffered_independent():
table = (('foo', 'bar'),
('C', 2),
('A', 9),
('A', 6),
('F', 1),
('D', 10))
expectation = (('foo', 'bar'),
('F', 1),
('C', 2),
('A', 6),
('A', 9),
('D', 10))
result = sort(table, 'bar', buffersize=4)
nrows(result) # cause data to be cached
# check that two row iterators are independent, i.e., consuming rows
# from one does not affect the other
it1 = iter(result)
it2 = iter(result)
eq_(expectation[0], next(it1))
eq_(expectation[1], next(it1))
eq_(expectation[0], next(it2))
eq_(expectation[1], next(it2))
eq_(expectation[2], next(it2))
eq_(expectation[2], next(it1))
def _get_names(l):
return [x.name for x in l]
def test_sort_buffered_cleanup():
table = (('foo', 'bar'),
('C', 2),
('A', 9),
('A', 6),
('F', 1),
('D', 10))
result = sort(table, 'bar', buffersize=2)
debug('initially filecache should be empty')
eq_(None, result._filecache)
debug('pull rows through, should populate file cache')
eq_(5, nrows(result))
eq_(3, len(result._filecache))
debug('check all files exist')
filenames = _get_names(result._filecache)
for fn in filenames:
assert os.path.exists(fn), fn
debug('delete object and garbage collect')
del result
gc.collect()
debug('check all files have been deleted')
for fn in filenames:
assert not os.path.exists(fn), fn
@pytest.mark.skipif(platform.python_implementation() == 'PyPy', reason='SKIP sort cleanup test (PyPy)')
def test_sort_buffered_cleanup_open_iterator():
table = (('foo', 'bar'),
('C', 2),
('A', 9),
('A', 6),
('F', 1),
('D', 10))
# check if cleanup is robust against open iterators
result = sort(table, 'bar', buffersize=2)
debug('pull rows through, should populate file cache')
eq_(5, nrows(result))
eq_(3, len(result._filecache))
debug('check all files exist')
filenames = _get_names(result._filecache)
for fn in filenames:
assert os.path.exists(fn), fn
debug(filenames)
debug('open an iterator')
it = iter(result)
next(it)
next(it)
debug('delete objects and garbage collect')
del result
del it
gc.collect()
for fn in filenames:
assert not os.path.exists(fn), fn
def test_sort_empty():
table = (('foo', 'bar'),)
expect = (('foo', 'bar'),)
actual = sort(table)
ieq(expect, actual)
def test_sort_none():
table = (('foo', 'bar'),
('C', 2),
('A', 9),
('A', None),
('F', 1),
('D', 10))
result = sort(table, 'bar')
print(list(result))
expectation = (('foo', 'bar'),
('A', None),
('F', 1),
('C', 2),
('A', 9),
('D', 10))
ieq(expectation, result)
dt = datetime.now().replace
table = (('foo', 'bar'),
('C', dt(hour=5)),
('A', dt(hour=1)),
('A', None),
('F', dt(hour=9)),
('D', dt(hour=17)))
result = sort(table, 'bar')
expectation = (('foo', 'bar'),
('A', None),
('A', dt(hour=1)),
('C', dt(hour=5)),
('F', dt(hour=9)),
('D', dt(hour=17)))
ieq(expectation, result)
# TODO test sort with native comparison
def test_mergesort_1():
table1 = (('foo', 'bar'),
('A', 6),
('C', 2),
('D', 10),
('A', 9),
('F', 1))
table2 = (('foo', 'bar'),
('B', 3),
('D', 10),
('A', 10),
('F', 4))
# should be same as concatenate then sort (but more efficient, esp. when
# presorted)
expect = sort(cat(table1, table2))
actual = mergesort(table1, table2)
ieq(expect, actual)
ieq(expect, actual)
actual = mergesort(sort(table1), sort(table2), presorted=True)
ieq(expect, actual)
ieq(expect, actual)
def test_mergesort_2():
table1 = (('foo', 'bar'),
('A', 9),
('C', 2),
('D', 10),
('A', 6),
('F', 1))
table2 = (('foo', 'baz'),
('B', 3),
('D', 10),
('A', 10),
('F', 4))
# should be same as concatenate then sort (but more efficient, esp. when
# presorted)
expect = sort(cat(table1, table2), key='foo')
actual = mergesort(table1, table2, key='foo')
ieq(expect, actual)
ieq(expect, actual)
actual = mergesort(sort(table1, key='foo'), sort(table2, key='foo'),
key='foo', presorted=True)
ieq(expect, actual)
ieq(expect, actual)
def test_mergesort_3():
table1 = (('foo', 'bar'),
('A', 9),
('C', 2),
('D', 10),
('A', 6),
('F', 1))
table2 = (('foo', 'baz'),
('B', 3),
('D', 10),
('A', 10),
('F', 4))
# should be same as concatenate then sort (but more efficient, esp. when
# presorted)
expect = sort(cat(table1, table2), key='foo', reverse=True)
actual = mergesort(table1, table2, key='foo', reverse=True)
ieq(expect, actual)
ieq(expect, actual)
actual = mergesort(sort(table1, key='foo', reverse=True),
sort(table2, key='foo', reverse=True),
key='foo', reverse=True, presorted=True)
ieq(expect, actual)
ieq(expect, actual)
def test_mergesort_4():
table1 = (('foo', 'bar', 'baz'),
(1, 'A', True),
(2, 'B', None),
(4, 'C', True))
table2 = (('bar', 'baz', 'quux'),
('A', True, 42.0),
('B', False, 79.3),
('C', False, 12.4))
expect = sort(cat(table1, table2), key='bar')
actual = mergesort(table1, table2, key='bar')
ieq(expect, actual)
ieq(expect, actual)
def test_mergesort_empty():
table1 = (('foo', 'bar'),
('A', 9),
('C', 2),
('D', 10),
('F', 1))
table2 = (('foo', 'bar'),)
expect = table1
actual = mergesort(table1, table2, key='foo')
ieq(expect, actual)
ieq(expect, actual)
def test_issorted():
table1 = (('foo', 'bar', 'baz'),
('a', 1, True),
('b', 3, True),
('b', 2))
assert issorted(table1, key='foo')
assert not issorted(table1, key='foo', reverse=True)
assert not issorted(table1, key='foo', strict=True)
table2 = (('foo', 'bar', 'baz'),
('b', 2, True),
('a', 1, True),
('b', 3))
assert not issorted(table2, key='foo')
table3 = (('foo', 'bar', 'baz'),
('a', 1, True),
('b', 2, True),
('b', 3))
assert issorted(table3, key=('foo', 'bar'))
assert issorted(table3)
table4 = (('foo', 'bar', 'baz'),
('a', 1, True),
('b', 3, True),
('b', 2))
assert not issorted(table4, key=('foo', 'bar'))
assert not issorted(table4)
table5 = (('foo', 'bar', 'baz'),
('b', 3, True),
('b', 2),
('a', 1, True))
assert not issorted(table5, key='foo')
assert issorted(table5, key='foo', reverse=True)
assert not issorted(table5, key='foo', reverse=True, strict=True)