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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.compat import PY3, next
from petl.util.base import header, fieldnames, data, dicts, records, \
namedtuples, itervalues, values, rowgroupby, expr
def test_header():
table = (('foo', 'bar'), ('a', 1), ('b', 2))
actual = header(table)
expect = ('foo', 'bar')
eq_(expect, actual)
table = (['foo', 'bar'], ['a', 1], ['b', 2])
actual = header(table)
eq_(expect, actual)
def test_fieldnames():
table = (('foo', 'bar'), ('a', 1), ('b', 2))
actual = fieldnames(table)
expect = ('foo', 'bar')
eq_(expect, actual)
class CustomField(object):
def __init__(self, key, description):
self.key = key
self.description = description
def __str__(self):
return self.key
def __repr__(self):
return 'CustomField(%r, %r)' % (self.key, self.description)
table = ((CustomField('foo', 'Get some foo.'),
CustomField('bar', 'A lot of bar.')),
('a', 1),
('b', 2))
actual = fieldnames(table)
expect = ('foo', 'bar')
eq_(expect, actual)
def test_data():
table = (('foo', 'bar'), ('a', 1), ('b', 2))
actual = data(table)
expect = (('a', 1), ('b', 2))
ieq(expect, actual)
def test_data_headerless():
table = []
actual = data(table)
expect = []
ieq(expect, actual)
def test_dicts():
table = (('foo', 'bar'), ('a', 1), ('b', 2))
actual = dicts(table)
expect = ({'foo': 'a', 'bar': 1}, {'foo': 'b', 'bar': 2})
ieq(expect, actual)
def test_dicts_headerless():
table = []
actual = dicts(table)
expect = []
ieq(expect, actual)
def test_dicts_shortrows():
table = (('foo', 'bar'), ('a', 1), ('b',))
actual = dicts(table)
expect = ({'foo': 'a', 'bar': 1}, {'foo': 'b', 'bar': None})
ieq(expect, actual)
def test_records():
table = (('foo', 'bar'), ('a', 1), ('b', 2), ('c', 3))
actual = records(table)
# access items
it = iter(actual)
o = next(it)
eq_('a', o['foo'])
eq_(1, o['bar'])
o = next(it)
eq_('b', o['foo'])
eq_(2, o['bar'])
# access attributes
it = iter(actual)
o = next(it)
eq_('a', o.foo)
eq_(1, o.bar)
o = next(it)
eq_('b', o.foo)
eq_(2, o.bar)
# access with get() method
it = iter(actual)
o = next(it)
eq_('a', o.get('foo'))
eq_(1, o.get('bar'))
eq_(None, o.get('baz'))
eq_('qux', o.get('baz', default='qux'))
def test_records_headerless():
table = []
actual = records(table)
expect = []
ieq(expect, actual)
def test_records_errors():
table = (('foo', 'bar'), ('a', 1), ('b', 2))
actual = records(table)
# access items
it = iter(actual)
o = next(it)
try:
o['baz']
except KeyError:
pass
else:
raise Exception('expected exception not raised')
try:
o.baz
except AttributeError:
pass
else:
raise Exception('expected exception not raised')
def test_records_unevenrows():
table = (('foo', 'bar'), ('a', 1, True), ('b',))
actual = records(table)
# access items
it = iter(actual)
o = next(it)
eq_('a', o['foo'])
eq_(1, o['bar'])
o = next(it)
eq_('b', o['foo'])
eq_(None, o['bar'])
# access attributes
it = iter(actual)
o = next(it)
eq_('a', o.foo)
eq_(1, o.bar)
o = next(it)
eq_('b', o.foo)
eq_(None, o.bar)
def test_namedtuples():
table = (('foo', 'bar'), ('a', 1), ('b', 2))
actual = namedtuples(table)
it = iter(actual)
o = next(it)
eq_('a', o.foo)
eq_(1, o.bar)
o = next(it)
eq_('b', o.foo)
eq_(2, o.bar)
def test_namedtuples_headerless():
table = []
actual = namedtuples(table)
expect = []
ieq(expect, actual)
def test_namedtuples_unevenrows():
table = (('foo', 'bar'), ('a', 1, True), ('b',))
actual = namedtuples(table)
it = iter(actual)
o = next(it)
eq_('a', o.foo)
eq_(1, o.bar)
o = next(it)
eq_('b', o.foo)
eq_(None, o.bar)
def test_itervalues():
table = (('foo', 'bar', 'baz'),
('a', 1, True),
('b', 2),
('b', 7, False))
actual = itervalues(table, 'foo')
expect = ('a', 'b', 'b')
ieq(expect, actual)
actual = itervalues(table, 'bar')
expect = (1, 2, 7)
ieq(expect, actual)
actual = itervalues(table, ('foo', 'bar'))
expect = (('a', 1), ('b', 2), ('b', 7))
ieq(expect, actual)
actual = itervalues(table, 'baz')
expect = (True, None, False)
ieq(expect, actual)
actual = itervalues(table, ('foo', 'baz'))
expect = (('a', True), ('b', None), ('b', False))
ieq(expect, actual)
def test_itervalues_headerless():
table = []
actual = itervalues(table, 'foo')
with pytest.raises(FieldSelectionError):
for i in actual:
pass
def test_values():
table = (('foo', 'bar', 'baz'),
('a', 1, True),
('b', 2),
('b', 7, False))
actual = values(table, 'foo')
expect = ('a', 'b', 'b')
ieq(expect, actual)
ieq(expect, actual)
actual = values(table, 'bar')
expect = (1, 2, 7)
ieq(expect, actual)
ieq(expect, actual)
# old style signature for multiple fields, still supported
actual = values(table, ('foo', 'bar'))
expect = (('a', 1), ('b', 2), ('b', 7))
ieq(expect, actual)
ieq(expect, actual)
# as of 0.24 new style signature for multiple fields
actual = values(table, 'foo', 'bar')
expect = (('a', 1), ('b', 2), ('b', 7))
ieq(expect, actual)
ieq(expect, actual)
actual = values(table, 'baz')
expect = (True, None, False)
ieq(expect, actual)
ieq(expect, actual)
def test_values_headerless():
table = []
actual = values(table, 'foo')
with pytest.raises(FieldSelectionError):
for i in actual:
pass
def test_rowgroupby():
table = (('foo', 'bar', 'baz'),
('a', 1, True),
('b', 2, True),
('b', 3))
# simplest form
g = rowgroupby(table, 'foo')
key, vals = next(g)
vals = list(vals)
eq_('a', key)
eq_(1, len(vals))
eq_(('a', 1, True), vals[0])
key, vals = next(g)
vals = list(vals)
eq_('b', key)
eq_(2, len(vals))
eq_(('b', 2, True), vals[0])
eq_(('b', 3), vals[1])
# specify value
g = rowgroupby(table, 'foo', 'bar')
key, vals = next(g)
vals = list(vals)
eq_('a', key)
eq_(1, len(vals))
eq_(1, vals[0])
key, vals = next(g)
vals = list(vals)
eq_('b', key)
eq_(2, len(vals))
eq_(2, vals[0])
eq_(3, vals[1])
# callable key
g = rowgroupby(table, lambda r: r['foo'], lambda r: r['baz'])
key, vals = next(g)
vals = list(vals)
eq_('a', key)
eq_(1, len(vals))
eq_(True, vals[0])
key, vals = next(g)
vals = list(vals)
eq_('b', key)
eq_(2, len(vals))
eq_(True, vals[0])
eq_(None, vals[1]) # gets padded
def test_rowgroupby_headerless():
table = []
with pytest.raises(FieldSelectionError):
rowgroupby(table, 'foo')
def test_expr_ok():
fu = expr("{foo} * {bar}")
res = fu({'foo': 3, 'bar': 2})
eq_(6, res)
def test_expr_nok():
fu = expr("{foo2} * {bar2}", trusted=True)
with pytest.raises(KeyError) as exc_info:
fu({'foo': 3, 'bar': 2})
assert exc_info is not None
def test_expr_inject():
with pytest.raises(Exception) as exc_info:
# trick: using trusted=None will allow to skip using asteval
fu = expr("__import__('os').system('ls')", trusted=None)
fu({'foo': 3, 'bar': 2})
assert exc_info is not None
def _has_asteval():
if PY3:
try:
import asteval
return True
except ImportError:
pass
return False
def test_expr_untrusted():
if _has_asteval():
with pytest.raises((ValueError, TypeError)) as exc_info:
_fu = expr("__import__('os').system('ls')", trusted=False)
if _fu is not None:
_fu({'foo': 3, 'bar': 2})
assert exc_info is not None
def test_expr_ok_untrusted():
if _has_asteval():
fu = expr("{foo} * {bar}")
res = fu({'foo': 3, 'bar': 2})
eq_(6, res)
def test_expr_nok_untrusted():
if _has_asteval():
fu = expr("{foo2} * {bar2}", trusted=True)
with pytest.raises(KeyError) as exc_info:
fu({'foo': 3, 'bar': 2})
assert exc_info is not None
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