/
test_lookups.py
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/
test_lookups.py
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from __future__ import absolute_import, print_function, division
from petl.errors import DuplicateKeyError
from petl.test.helpers import eq_
from petl import cut, lookup, lookupone, dictlookup, dictlookupone, \
recordlookup, recordlookupone
def test_lookup():
t1 = (('foo', 'bar'), ('a', 1), ('b', 2), ('b', 3))
# lookup one column on another
actual = lookup(t1, 'foo', 'bar')
expect = {'a': [1], 'b': [2, 3]}
eq_(expect, actual)
# test default value - tuple of whole row
actual = lookup(t1, 'foo') # no value selector
expect = {'a': [('a', 1)], 'b': [('b', 2), ('b', 3)]}
eq_(expect, actual)
# test default value - key only
actual = lookup(cut(t1, 'foo'), 'foo')
expect = {'a': [('a',)], 'b': [('b',), ('b',)]}
eq_(expect, actual)
t2 = (('foo', 'bar', 'baz'),
('a', 1, True),
('b', 2, False),
('b', 3, True),
('b', 3, False))
# test value selection
actual = lookup(t2, 'foo', ('bar', 'baz'))
expect = {'a': [(1, True)], 'b': [(2, False), (3, True), (3, False)]}
eq_(expect, actual)
# test compound key
actual = lookup(t2, ('foo', 'bar'), 'baz')
expect = {('a', 1): [True], ('b', 2): [False], ('b', 3): [True, False]}
eq_(expect, actual)
def test_lookupone():
t1 = (('foo', 'bar'), ('a', 1), ('b', 2), ('b', 3))
# lookup one column on another under strict mode
try:
lookupone(t1, 'foo', 'bar', strict=True)
except DuplicateKeyError:
pass # expected
else:
assert False, 'expected error'
# lookup one column on another under, not strict
actual = lookupone(t1, 'foo', 'bar', strict=False)
expect = {'a': 1, 'b': 2} # first value wins
eq_(expect, actual)
# test default value - tuple of whole row
actual = lookupone(t1, 'foo', strict=False) # no value selector
expect = {'a': ('a', 1), 'b': ('b', 2)} # first wins
eq_(expect, actual)
# test default value - key only
actual = lookupone(cut(t1, 'foo'), 'foo')
expect = {'a': ('a',), 'b': ('b',)}
eq_(expect, actual)
t2 = (('foo', 'bar', 'baz'),
('a', 1, True),
('b', 2, False),
('b', 3, True),
('b', 3, False))
# test value selection
actual = lookupone(t2, 'foo', ('bar', 'baz'), strict=False)
expect = {'a': (1, True), 'b': (2, False)}
eq_(expect, actual)
# test compound key
actual = lookupone(t2, ('foo', 'bar'), 'baz', strict=False)
expect = {('a', 1): True, ('b', 2): False, ('b', 3): True} # first wins
eq_(expect, actual)
def test_dictlookup():
t1 = (('foo', 'bar'), ('a', 1), ('b', 2), ('b', 3))
actual = dictlookup(t1, 'foo')
expect = {'a': [{'foo': 'a', 'bar': 1}],
'b': [{'foo': 'b', 'bar': 2}, {'foo': 'b', 'bar': 3}]}
eq_(expect, actual)
# key only
actual = dictlookup(cut(t1, 'foo'), 'foo')
expect = {'a': [{'foo': 'a'}],
'b': [{'foo': 'b'}, {'foo': 'b'}]}
eq_(expect, actual)
t2 = (('foo', 'bar', 'baz'),
('a', 1, True),
('b', 2, False),
('b', 3, True),
('b', 3, False))
# test compound key
actual = dictlookup(t2, ('foo', 'bar'))
expect = {('a', 1): [{'foo': 'a', 'bar': 1, 'baz': True}],
('b', 2): [{'foo': 'b', 'bar': 2, 'baz': False}],
('b', 3): [{'foo': 'b', 'bar': 3, 'baz': True},
{'foo': 'b', 'bar': 3, 'baz': False}]}
eq_(expect, actual)
def test_dictlookupone():
t1 = (('foo', 'bar'), ('a', 1), ('b', 2), ('b', 3))
try:
dictlookupone(t1, 'foo', strict=True)
except DuplicateKeyError:
pass # expected
else:
assert False, 'expected error'
# relax
actual = dictlookupone(t1, 'foo', strict=False)
# first wins
expect = {'a': {'foo': 'a', 'bar': 1}, 'b': {'foo': 'b', 'bar': 2}}
eq_(expect, actual)
# key only
actual = dictlookupone(cut(t1, 'foo'), 'foo')
expect = {'a': {'foo': 'a'},
'b': {'foo': 'b'}}
eq_(expect, actual)
t2 = (('foo', 'bar', 'baz'),
('a', 1, True),
('b', 2, False),
('b', 3, True),
('b', 3, False))
# test compound key
actual = dictlookupone(t2, ('foo', 'bar'), strict=False)
expect = {('a', 1): {'foo': 'a', 'bar': 1, 'baz': True},
('b', 2): {'foo': 'b', 'bar': 2, 'baz': False},
('b', 3): {'foo': 'b', 'bar': 3, 'baz': True}} # first wins
eq_(expect, actual)
def test_recordlookup():
t1 = (('foo', 'bar'), ('a', 1), ('b', 2), ('b', 3))
lkp = recordlookup(t1, 'foo')
eq_(['a'], [r.foo for r in lkp['a']])
eq_(['b', 'b'], [r.foo for r in lkp['b']])
eq_([1], [r.bar for r in lkp['a']])
eq_([2, 3], [r.bar for r in lkp['b']])
# key only
lkp = recordlookup(cut(t1, 'foo'), 'foo')
eq_(['a'], [r.foo for r in lkp['a']])
eq_(['b', 'b'], [r.foo for r in lkp['b']])
def test_recordlookupone():
t1 = (('foo', 'bar'), ('a', 1), ('b', 2), ('b', 3))
try:
recordlookupone(t1, 'foo', strict=True)
except DuplicateKeyError:
pass # expected
else:
assert False, 'expected error'
# relax
lkp = recordlookupone(t1, 'foo', strict=False)
eq_('a', lkp['a'].foo)
eq_('b', lkp['b'].foo)
eq_(1, lkp['a'].bar)
eq_(2, lkp['b'].bar) # first wins
# key only
lkp = recordlookupone(cut(t1, 'foo'), 'foo', strict=False)
eq_('a', lkp['a'].foo)
eq_('b', lkp['b'].foo)