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test_conversions.py
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test_conversions.py
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from __future__ import absolute_import, print_function, division
from petl.test.helpers import ieq
from petl.transform.conversions import convert, convertall, convertnumbers, \
replace, update, format, interpolate
def test_convert():
table1 = (('foo', 'bar', 'baz'),
('A', 1, 2),
('B', '2', '3.4'),
(u'B', u'3', u'7.8', True),
('D', 'xyz', 9.0),
('E', None))
# test the simplest style - single field, lambda function
table2 = convert(table1, 'foo', lambda s: s.lower())
expect2 = (('foo', 'bar', 'baz'),
('a', 1, 2),
('b', '2', '3.4'),
(u'b', u'3', u'7.8', True),
('d', 'xyz', 9.0),
('e', None))
ieq(expect2, table2)
ieq(expect2, table2)
# test single field with method call
table3 = convert(table1, 'foo', 'lower')
expect3 = expect2
ieq(expect3, table3)
# test single field with method call with arguments
table4 = convert(table1, 'foo', 'replace', 'B', 'BB')
expect4 = (('foo', 'bar', 'baz'),
('A', 1, 2),
('BB', '2', '3.4'),
(u'BB', u'3', u'7.8', True),
('D', 'xyz', 9.0),
('E', None))
ieq(expect4, table4)
# test multiple fields with the same conversion
table5 = convert(table1, ('bar', 'baz'), str)
expect5 = (('foo', 'bar', 'baz'),
('A', '1', '2'),
('B', '2', '3.4'),
(u'B', u'3', u'7.8', True),
('D', 'xyz', '9.0'),
('E', 'None'))
ieq(expect5, table5)
# test convert with dictionary
table6 = convert(table1, 'foo', {'A': 'Z', 'B': 'Y'})
expect6 = (('foo', 'bar', 'baz'),
('Z', 1, 2),
('Y', '2', '3.4'),
(u'Y', u'3', u'7.8', True),
('D', 'xyz', 9.0),
('E', None))
ieq(expect6, table6)
def test_convert_empty():
table = (('foo', 'bar'),)
expect = (('foo', 'bar'),)
actual = convert(table, 'foo', int)
ieq(expect, actual)
def test_convert_indexes():
table1 = (('foo', 'bar', 'baz'),
('A', 1, 2),
('B', '2', '3.4'),
(u'B', u'3', u'7.8', True),
('D', 'xyz', 9.0),
('E', None))
# test the simplest style - single field, lambda function
table2 = convert(table1, 0, lambda s: s.lower())
expect2 = (('foo', 'bar', 'baz'),
('a', 1, 2),
('b', '2', '3.4'),
(u'b', u'3', u'7.8', True),
('d', 'xyz', 9.0),
('e', None))
ieq(expect2, table2)
ieq(expect2, table2)
# test single field with method call
table3 = convert(table1, 0, 'lower')
expect3 = expect2
ieq(expect3, table3)
# test single field with method call with arguments
table4 = convert(table1, 0, 'replace', 'B', 'BB')
expect4 = (('foo', 'bar', 'baz'),
('A', 1, 2),
('BB', '2', '3.4'),
(u'BB', u'3', u'7.8', True),
('D', 'xyz', 9.0),
('E', None))
ieq(expect4, table4)
# test multiple fields with the same conversion
table5a = convert(table1, (1, 2), str)
table5b = convert(table1, (1, 'baz'), str)
table5c = convert(table1, ('bar', 2), str)
table5d = convert(table1, list(range(1, 3)), str)
expect5 = (('foo', 'bar', 'baz'),
('A', '1', '2'),
('B', '2', '3.4'),
(u'B', u'3', u'7.8', True),
('D', 'xyz', '9.0'),
('E', 'None'))
ieq(expect5, table5a)
ieq(expect5, table5b)
ieq(expect5, table5c)
ieq(expect5, table5d)
# test convert with dictionary
table6 = convert(table1, 0, {'A': 'Z', 'B': 'Y'})
expect6 = (('foo', 'bar', 'baz'),
('Z', 1, 2),
('Y', '2', '3.4'),
(u'Y', u'3', u'7.8', True),
('D', 'xyz', 9.0),
('E', None))
ieq(expect6, table6)
def test_fieldconvert():
table1 = (('foo', 'bar', 'baz'),
('A', 1, 2),
('B', '2', '3.4'),
(u'B', u'3', u'7.8', True),
('D', 'xyz', 9.0),
('E', None))
# test the style where the converters functions are passed in as a
# dictionary
converters = {'foo': str, 'bar': int, 'baz': float}
table5 = convert(table1, converters, errorvalue='error')
expect5 = (('foo', 'bar', 'baz'),
('A', 1, 2.0),
('B', 2, 3.4),
('B', 3, 7.8, True), # N.B., long rows are preserved
('D', 'error', 9.0),
('E', 'error')) # N.B., short rows are preserved
ieq(expect5, table5)
# test the style where the converters functions are added one at a time
table6 = convert(table1, errorvalue='err')
table6['foo'] = str
table6['bar'] = int
table6['baz'] = float
expect6 = (('foo', 'bar', 'baz'),
('A', 1, 2.0),
('B', 2, 3.4),
('B', 3, 7.8, True),
('D', 'err', 9.0),
('E', 'err'))
ieq(expect6, table6)
# test some different converters
table7 = convert(table1)
table7['foo'] = 'replace', 'B', 'BB'
expect7 = (('foo', 'bar', 'baz'),
('A', 1, 2),
('BB', '2', '3.4'),
(u'BB', u'3', u'7.8', True),
('D', 'xyz', 9.0),
('E', None))
ieq(expect7, table7)
# test the style where the converters functions are passed in as a list
converters = [str, int, float]
table8 = convert(table1, converters, errorvalue='error')
expect8 = (('foo', 'bar', 'baz'),
('A', 1, 2.0),
('B', 2, 3.4),
('B', 3, 7.8, True), # N.B., long rows are preserved
('D', 'error', 9.0),
('E', 'error')) # N.B., short rows are preserved
ieq(expect8, table8)
# test the style where the converters functions are passed in as a list
converters = [str, None, float]
table9 = convert(table1, converters, errorvalue='error')
expect9 = (('foo', 'bar', 'baz'),
('A', 1, 2.0),
('B', '2', 3.4),
('B', u'3', 7.8, True), # N.B., long rows are preserved
('D', 'xyz', 9.0),
('E', None)) # N.B., short rows are preserved
ieq(expect9, table9)
def test_convertall():
table1 = (('foo', 'bar', 'baz'),
('1', '3', '9'),
('2', '1', '7'))
table2 = convertall(table1, int)
expect2 = (('foo', 'bar', 'baz'),
(1, 3, 9),
(2, 1, 7))
ieq(expect2, table2)
ieq(expect2, table2)
def test_convertnumbers():
table1 = (('foo', 'bar', 'baz', 'quux'),
('1', '3.0', '9+3j', 'aaa'),
('2', '1.3', '7+2j', None))
table2 = convertnumbers(table1)
expect2 = (('foo', 'bar', 'baz', 'quux'),
(1, 3.0, 9+3j, 'aaa'),
(2, 1.3, 7+2j, None))
ieq(expect2, table2)
ieq(expect2, table2)
def test_convert_translate():
table = (('foo', 'bar'),
('M', 12),
('F', 34),
('-', 56))
trans = {'M': 'male', 'F': 'female'}
result = convert(table, 'foo', trans)
expectation = (('foo', 'bar'),
('male', 12),
('female', 34),
('-', 56))
ieq(expectation, result)
def test_convert_with_row():
table = (('foo', 'bar'),
('a', 1),
('b', 2))
expect = (('foo', 'bar'),
('a', 'A'),
('b', 'B'))
actual = convert(table, 'bar',
lambda v, row: row.foo.upper(),
pass_row=True)
ieq(expect, actual)
def test_convert_with_row_backwards_compat():
table = (('foo', 'bar'),
(' a ', 1),
(' b ', 2))
expect = (('foo', 'bar'),
('a', 1),
('b', 2))
actual = convert(table, 'foo', 'strip')
ieq(expect, actual)
def test_convert_where():
tbl1 = (('foo', 'bar'),
('a', 1),
('b', 2))
expect = (('foo', 'bar'),
('a', 1),
('b', 4))
actual = convert(tbl1, 'bar', lambda v: v*2, where=lambda r: r.foo == 'b')
ieq(expect, actual)
ieq(expect, actual)
actual = convert(tbl1, 'bar', lambda v: v*2, where="{foo} == 'b'")
ieq(expect, actual)
ieq(expect, actual)
def test_replace_where():
tbl1 = (('foo', 'bar'),
('a', 1),
('b', 2))
expect = (('foo', 'bar'),
('a', 1),
('b', 4))
actual = replace(tbl1, 'bar', 2, 4, where=lambda r: r.foo == 'b')
ieq(expect, actual)
ieq(expect, actual)
actual = replace(tbl1, 'bar', 2, 4, where="{foo} == 'b'")
ieq(expect, actual)
ieq(expect, actual)
def test_update():
table1 = (('foo', 'bar', 'baz'),
('A', 1, 2),
('B', '2', '3.4'),
(u'B', u'3', u'7.8', True),
('D', 'xyz', 9.0),
('E', None))
table2 = update(table1, 'foo', 'X')
expect2 = (('foo', 'bar', 'baz'),
('X', 1, 2),
('X', '2', '3.4'),
('X', u'3', u'7.8', True),
('X', 'xyz', 9.0),
('X', None))
ieq(expect2, table2)
ieq(expect2, table2)
def test_replace_unhashable():
table1 = (('foo', 'bar'), ('a', ['b']), ('c', None))
expect = (('foo', 'bar'), ('a', ['b']), ('c', []))
actual = replace(table1, 'bar', None, [])
ieq(expect, actual)
def test_format():
table = (('foo', 'bar'),
('a', 1),
('b', 2))
expect = (('foo', 'bar'),
('a', '01'),
('b', '02'))
actual = format(table, 'bar', '{0:02d}')
ieq(expect, actual)
ieq(expect, actual)
def test_interpolate():
table = (('foo', 'bar'),
('a', 1),
('b', 2))
expect = (('foo', 'bar'),
('a', '01'),
('b', '02'))
actual = interpolate(table, 'bar', '%02d')
ieq(expect, actual)
ieq(expect, actual)