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# -*- coding: utf-8 -*-
from __future__ import absolute_import, print_function, division
from collections import OrderedDict
from tempfile import NamedTemporaryFile
import json
import pytest
from petl.test.helpers import ieq
from petl import fromjson, fromdicts, tojson, tojsonarrays
def test_fromjson_1():
f = NamedTemporaryFile(delete=False, mode='w')
data = '[{"foo": "a", "bar": 1}, ' \
'{"foo": "b", "bar": 2}, ' \
'{"foo": "c", "bar": 2}]'
f.write(data)
f.close()
actual = fromjson(f.name, header=['foo', 'bar'])
expect = (('foo', 'bar'),
('a', 1),
('b', 2),
('c', 2))
ieq(expect, actual)
ieq(expect, actual) # verify can iterate twice
def test_fromjson_2():
f = NamedTemporaryFile(delete=False, mode='w')
data = '[{"foo": "a", "bar": 1}, ' \
'{"foo": "b"}, ' \
'{"foo": "c", "bar": 2, "baz": true}]'
f.write(data)
f.close()
actual = fromjson(f.name, header=['bar', 'baz', 'foo'])
expect = (('bar', 'baz', 'foo'),
(1, None, 'a'),
(None, None, 'b'),
(2, True, 'c'))
ieq(expect, actual)
ieq(expect, actual) # verify can iterate twice
def test_fromjson_3():
f = NamedTemporaryFile(delete=False, mode='w')
data = '[{"foo": "a", "bar": 1}, ' \
'{"foo": "b"}, ' \
'{"foo": "c", "bar": 2, "baz": true}]'
f.write(data)
f.close()
actual = fromjson(f.name, header=['foo', 'bar'])
expect = (('foo', 'bar'),
('a', 1),
('b', None),
('c', 2))
ieq(expect, actual)
ieq(expect, actual) # verify can iterate twice
def test_fromdicts_1():
data = [{'foo': 'a', 'bar': 1},
{'foo': 'b', 'bar': 2},
{'foo': 'c', 'bar': 2}]
actual = fromdicts(data, header=['foo', 'bar'])
expect = (('foo', 'bar'),
('a', 1),
('b', 2),
('c', 2))
ieq(expect, actual)
ieq(expect, actual) # verify can iterate twice
def test_fromdicts_2():
data = [{'foo': 'a', 'bar': 1},
{'foo': 'b'},
{'foo': 'c', 'bar': 2, 'baz': True}]
actual = fromdicts(data, header=['bar', 'baz', 'foo'])
expect = (('bar', 'baz', 'foo'),
(1, None, 'a'),
(None, None, 'b'),
(2, True, 'c'))
ieq(expect, actual)
ieq(expect, actual) # verify can iterate twice
def test_fromdicts_3():
data = [{'foo': 'a', 'bar': 1},
{'foo': 'b'},
{'foo': 'c', 'bar': 2, 'baz': True}]
actual = fromdicts(data, header=['foo', 'bar'])
expect = (('foo', 'bar'),
('a', 1),
('b', None),
('c', 2))
ieq(expect, actual)
ieq(expect, actual) # verify can iterate twice
def test_fromdicts_onepass():
# check that fromdicts() only makes a single pass through the data
data = iter([{'foo': 'a', 'bar': 1},
{'foo': 'b', 'bar': 2},
{'foo': 'c', 'bar': 2}])
actual = fromdicts(data, header=['foo', 'bar'])
expect = (('foo', 'bar'),
('a', 1),
('b', 2),
('c', 2))
ieq(expect, actual)
def test_fromdicts_ordered():
data = [OrderedDict([('foo', 'a'), ('bar', 1)]),
OrderedDict([('foo', 'b')]),
OrderedDict([('foo', 'c'), ('bar', 2), ('baz', True)])]
actual = fromdicts(data)
# N.B., fields come out in original order
expect = (('foo', 'bar', 'baz'),
('a', 1, None),
('b', None, None),
('c', 2, True))
ieq(expect, actual)
def test_fromdicts_missing():
data = [OrderedDict([('foo', 'a'), ('bar', 1)]),
OrderedDict([('foo', 'b')]),
OrderedDict([('foo', 'c'), ('bar', 2), ('baz', True)])]
actual = fromdicts(data, missing="x")
expect = (('foo', 'bar', 'baz'),
('a', 1, "x"),
('b', "x", "x"),
('c', 2, True))
ieq(expect, actual)
def test_tojson():
# exercise function
table = (('foo', 'bar'),
('a', 1),
('b', 2),
('c', 2))
f = NamedTemporaryFile(delete=False, mode='r')
tojson(table, f.name)
result = json.load(f)
assert len(result) == 3
assert result[0]['foo'] == 'a'
assert result[0]['bar'] == 1
assert result[1]['foo'] == 'b'
assert result[1]['bar'] == 2
assert result[2]['foo'] == 'c'
assert result[2]['bar'] == 2
def test_tojsonarrays():
# exercise function
table = (('foo', 'bar'),
('a', 1),
('b', 2),
('c', 2))
f = NamedTemporaryFile(delete=False, mode='r')
tojsonarrays(table, f.name)
result = json.load(f)
assert len(result) == 3
assert result[0][0] == 'a'
assert result[0][1] == 1
assert result[1][0] == 'b'
assert result[1][1] == 2
assert result[2][0] == 'c'
assert result[2][1] == 2
def test_fromdicts_header_does_not_raise():
data = [{'foo': 'a', 'bar': 1},
{'foo': 'b', 'bar': 2},
{'foo': 'c', 'bar': 2}]
actual = fromdicts(data)
assert actual.header()
def test_fromdicts_header_list():
data = [OrderedDict([('foo', 'a'), ('bar', 1)]),
OrderedDict([('foo', 'b'), ('bar', 2)]),
OrderedDict([('foo', 'c'), ('bar', 2)])]
actual = fromdicts(data)
header = actual.header()
assert header == ('foo', 'bar')
expect = (('foo', 'bar'),
('a', 1),
('b', 2),
('c', 2))
ieq(expect, actual)
ieq(expect, actual)
@pytest.fixture
def dicts_generator():
def generator():
yield OrderedDict([('foo', 'a'), ('bar', 1)])
yield OrderedDict([('foo', 'b'), ('bar', 2)])
yield OrderedDict([('foo', 'c'), ('bar', 2)])
return generator()
def test_fromdicts_generator_single(dicts_generator):
actual = fromdicts(dicts_generator)
expect = (('foo', 'bar'),
('a', 1),
('b', 2),
('c', 2))
ieq(expect, actual)
def test_fromdicts_generator_twice(dicts_generator):
actual = fromdicts(dicts_generator)
expect = (('foo', 'bar'),
('a', 1),
('b', 2),
('c', 2))
ieq(expect, actual)
ieq(expect, actual)
def test_fromdicts_generator_header(dicts_generator):
actual = fromdicts(dicts_generator)
header = actual.header()
assert header == ('foo', 'bar')
expect = (('foo', 'bar'),
('a', 1),
('b', 2),
('c', 2))
ieq(expect, actual)
ieq(expect, actual)
def test_fromdicts_generator_random_access():
def generator():
for i in range(5):
yield OrderedDict([('n', i), ('foo', 100*i), ('bar', 200*i)])
actual = fromdicts(generator(), sample=3)
assert actual.header() == ('n', 'foo', 'bar')
# first pass
it1 = iter(actual)
first_row1 = next(it1)
first_row2 = next(it1)
# second pass
it2 = iter(actual)
second_row1 = next(it2)
second_row2 = next(it2)
assert first_row1 == second_row1
assert first_row2 == second_row2
# reverse order
second_row3 = next(it2)
first_row3 = next(it1)
assert second_row3 == first_row3
ieq(actual, actual)
assert actual.header() == ('n', 'foo', 'bar')
assert len(actual) == 6
def test_fromdicts_generator_missing():
def generator():
yield OrderedDict([('foo', 'a'), ('bar', 1)])
yield OrderedDict([('foo', 'b'), ('bar', 2)])
yield OrderedDict([('foo', 'c'), ('baz', 2)])
actual = fromdicts(generator(), missing="x")
expect = (('foo', 'bar', 'baz'),
('a', 1, "x"),
('b', 2, "x"),
('c', "x", 2))
ieq(expect, actual)
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