/usr/lib/python3/dist-packages/pandas/tests/test_expressions.py is in python3-pandas 0.13.1-2ubuntu2.
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# pylint: disable-msg=W0612,E1101
import nose
from numpy.random import randn
import operator
import numpy as np
from numpy.testing import assert_array_equal
from pandas.core.api import DataFrame, Panel
from pandas.computation import expressions as expr
from pandas import compat
from pandas.util.testing import (assert_almost_equal, assert_series_equal,
assert_frame_equal, assert_panel_equal,
assert_panel4d_equal)
import pandas.util.testing as tm
from numpy.testing.decorators import slow
if not expr._USE_NUMEXPR:
try:
import numexpr
except ImportError:
msg = "don't have"
else:
msg = "not using"
raise nose.SkipTest("{0} numexpr".format(msg))
_frame = DataFrame(randn(10000, 4), columns=list('ABCD'), dtype='float64')
_frame2 = DataFrame(randn(100, 4), columns = list('ABCD'), dtype='float64')
_mixed = DataFrame({ 'A' : _frame['A'].copy(), 'B' : _frame['B'].astype('float32'), 'C' : _frame['C'].astype('int64'), 'D' : _frame['D'].astype('int32') })
_mixed2 = DataFrame({ 'A' : _frame2['A'].copy(), 'B' : _frame2['B'].astype('float32'), 'C' : _frame2['C'].astype('int64'), 'D' : _frame2['D'].astype('int32') })
_integer = DataFrame(np.random.randint(1, 100, size=(10001, 4)), columns = list('ABCD'), dtype='int64')
_integer2 = DataFrame(np.random.randint(1, 100, size=(101, 4)),
columns=list('ABCD'), dtype='int64')
_frame_panel = Panel(dict(ItemA=_frame.copy(), ItemB=(_frame.copy() + 3), ItemC=_frame.copy(), ItemD=_frame.copy()))
_frame2_panel = Panel(dict(ItemA=_frame2.copy(), ItemB=(_frame2.copy() + 3),
ItemC=_frame2.copy(), ItemD=_frame2.copy()))
_integer_panel = Panel(dict(ItemA=_integer,
ItemB=(_integer + 34).astype('int64')))
_integer2_panel = Panel(dict(ItemA=_integer2,
ItemB=(_integer2 + 34).astype('int64')))
_mixed_panel = Panel(dict(ItemA=_mixed, ItemB=(_mixed + 3)))
_mixed2_panel = Panel(dict(ItemA=_mixed2, ItemB=(_mixed2 + 3)))
class TestExpressions(tm.TestCase):
_multiprocess_can_split_ = False
def setUp(self):
self.frame = _frame.copy()
self.frame2 = _frame2.copy()
self.mixed = _mixed.copy()
self.mixed2 = _mixed2.copy()
self.integer = _integer.copy()
self._MIN_ELEMENTS = expr._MIN_ELEMENTS
def tearDown(self):
expr._MIN_ELEMENTS = self._MIN_ELEMENTS
@nose.tools.nottest
def run_arithmetic_test(self, df, other, assert_func, check_dtype=False,
test_flex=True):
expr._MIN_ELEMENTS = 0
operations = ['add', 'sub', 'mul', 'mod', 'truediv', 'floordiv', 'pow']
if not compat.PY3:
operations.append('div')
for arith in operations:
operator_name = arith
if arith == 'div':
operator_name = 'truediv'
if test_flex:
op = lambda x, y: getattr(df, arith)(y)
op.__name__ = arith
else:
op = getattr(operator, operator_name)
expr.set_use_numexpr(False)
expected = op(df, other)
expr.set_use_numexpr(True)
result = op(df, other)
try:
if check_dtype:
if arith == 'truediv':
assert expected.dtype.kind == 'f'
assert_func(expected, result)
except Exception:
print("Failed test with operator %r" % op.__name__)
raise
def test_integer_arithmetic(self):
self.run_arithmetic_test(self.integer, self.integer,
assert_frame_equal)
self.run_arithmetic_test(self.integer.icol(0), self.integer.icol(0),
assert_series_equal, check_dtype=True)
@nose.tools.nottest
def run_binary_test(self, df, other, assert_func,
test_flex=False, numexpr_ops=set(['gt', 'lt', 'ge',
'le', 'eq', 'ne'])):
"""
tests solely that the result is the same whether or not numexpr is
enabled. Need to test whether the function does the correct thing
elsewhere.
"""
expr._MIN_ELEMENTS = 0
expr.set_test_mode(True)
operations = ['gt', 'lt', 'ge', 'le', 'eq', 'ne']
for arith in operations:
if test_flex:
op = lambda x, y: getattr(df, arith)(y)
op.__name__ = arith
else:
op = getattr(operator, arith)
expr.set_use_numexpr(False)
expected = op(df, other)
expr.set_use_numexpr(True)
expr.get_test_result()
result = op(df, other)
used_numexpr = expr.get_test_result()
try:
if arith in numexpr_ops:
assert used_numexpr, "Did not use numexpr as expected."
else:
assert not used_numexpr, "Used numexpr unexpectedly."
assert_func(expected, result)
except Exception:
print("Failed test with operation %r" % arith)
print("test_flex was %r" % test_flex)
raise
def run_frame(self, df, other, binary_comp=None, run_binary=True,
**kwargs):
self.run_arithmetic_test(df, other, assert_frame_equal,
test_flex=False, **kwargs)
self.run_arithmetic_test(df, other, assert_frame_equal, test_flex=True,
**kwargs)
if run_binary:
if binary_comp is None:
expr.set_use_numexpr(False)
binary_comp = other + 1
expr.set_use_numexpr(True)
self.run_binary_test(df, binary_comp, assert_frame_equal,
test_flex=False, **kwargs)
self.run_binary_test(df, binary_comp, assert_frame_equal,
test_flex=True, **kwargs)
def run_series(self, ser, other, binary_comp=None, **kwargs):
self.run_arithmetic_test(ser, other, assert_series_equal,
test_flex=False, **kwargs)
self.run_arithmetic_test(ser, other, assert_almost_equal,
test_flex=True, **kwargs)
# series doesn't uses vec_compare instead of numexpr...
# if binary_comp is None:
# binary_comp = other + 1
# self.run_binary_test(ser, binary_comp, assert_frame_equal, test_flex=False,
# **kwargs)
# self.run_binary_test(ser, binary_comp, assert_frame_equal, test_flex=True,
# **kwargs)
def run_panel(self, panel, other, binary_comp=None, run_binary=True,
assert_func=assert_panel_equal, **kwargs):
self.run_arithmetic_test(panel, other, assert_func, test_flex=False,
**kwargs)
self.run_arithmetic_test(panel, other, assert_func, test_flex=True,
**kwargs)
if run_binary:
if binary_comp is None:
binary_comp = other + 1
self.run_binary_test(panel, binary_comp, assert_func,
test_flex=False, **kwargs)
self.run_binary_test(panel, binary_comp, assert_func,
test_flex=True, **kwargs)
def test_integer_arithmetic_frame(self):
self.run_frame(self.integer, self.integer)
def test_integer_arithmetic_series(self):
self.run_series(self.integer.icol(0), self.integer.icol(0))
@slow
def test_integer_panel(self):
self.run_panel(_integer2_panel, np.random.randint(1, 100))
def test_float_arithemtic_frame(self):
self.run_frame(self.frame2, self.frame2)
def test_float_arithmetic_series(self):
self.run_series(self.frame2.icol(0), self.frame2.icol(0))
@slow
def test_float_panel(self):
self.run_panel(_frame2_panel, np.random.randn() + 0.1, binary_comp=0.8)
@slow
def test_panel4d(self):
self.run_panel(tm.makePanel4D(), np.random.randn() + 0.5,
assert_func=assert_panel4d_equal, binary_comp=3)
def test_mixed_arithmetic_frame(self):
# TODO: FIGURE OUT HOW TO GET IT TO WORK...
# can't do arithmetic because comparison methods try to do *entire*
# frame instead of by-column
self.run_frame(self.mixed2, self.mixed2, run_binary=False)
def test_mixed_arithmetic_series(self):
for col in self.mixed2.columns:
self.run_series(self.mixed2[col], self.mixed2[col], binary_comp=4)
@slow
def test_mixed_panel(self):
self.run_panel(_mixed2_panel, np.random.randint(1, 100),
binary_comp=-2)
def test_float_arithemtic(self):
self.run_arithmetic_test(self.frame, self.frame, assert_frame_equal)
self.run_arithmetic_test(self.frame.icol(0), self.frame.icol(0),
assert_series_equal, check_dtype=True)
def test_mixed_arithmetic(self):
self.run_arithmetic_test(self.mixed, self.mixed, assert_frame_equal)
for col in self.mixed.columns:
self.run_arithmetic_test(self.mixed[col], self.mixed[col],
assert_series_equal)
def test_integer_with_zeros(self):
self.integer *= np.random.randint(0, 2, size=np.shape(self.integer))
self.run_arithmetic_test(self.integer, self.integer, assert_frame_equal)
self.run_arithmetic_test(self.integer.icol(0), self.integer.icol(0),
assert_series_equal)
def test_invalid(self):
# no op
result = expr._can_use_numexpr(operator.add, None, self.frame, self.frame, 'evaluate')
self.assert_(result == False)
# mixed
result = expr._can_use_numexpr(operator.add, '+', self.mixed, self.frame, 'evaluate')
self.assert_(result == False)
# min elements
result = expr._can_use_numexpr(operator.add, '+', self.frame2, self.frame2, 'evaluate')
self.assert_(result == False)
# ok, we only check on first part of expression
result = expr._can_use_numexpr(operator.add, '+', self.frame, self.frame2, 'evaluate')
self.assert_(result == True)
def test_binary_ops(self):
def testit():
for f, f2 in [ (self.frame, self.frame2), (self.mixed, self.mixed2) ]:
for op, op_str in [('add','+'),('sub','-'),('mul','*'),('div','/'),('pow','**')]:
if op == 'div':
op = getattr(operator, 'truediv', None)
else:
op = getattr(operator, op, None)
if op is not None:
result = expr._can_use_numexpr(op, op_str, f, f, 'evaluate')
self.assert_(result == (not f._is_mixed_type))
result = expr.evaluate(op, op_str, f, f, use_numexpr=True)
expected = expr.evaluate(op, op_str, f, f, use_numexpr=False)
assert_array_equal(result,expected.values)
result = expr._can_use_numexpr(op, op_str, f2, f2, 'evaluate')
self.assert_(result == False)
expr.set_use_numexpr(False)
testit()
expr.set_use_numexpr(True)
expr.set_numexpr_threads(1)
testit()
expr.set_numexpr_threads()
testit()
def test_boolean_ops(self):
def testit():
for f, f2 in [ (self.frame, self.frame2), (self.mixed, self.mixed2) ]:
f11 = f
f12 = f + 1
f21 = f2
f22 = f2 + 1
for op, op_str in [('gt','>'),('lt','<'),('ge','>='),('le','<='),('eq','=='),('ne','!=')]:
op = getattr(operator,op)
result = expr._can_use_numexpr(op, op_str, f11, f12, 'evaluate')
self.assert_(result == (not f11._is_mixed_type))
result = expr.evaluate(op, op_str, f11, f12, use_numexpr=True)
expected = expr.evaluate(op, op_str, f11, f12, use_numexpr=False)
assert_array_equal(result,expected.values)
result = expr._can_use_numexpr(op, op_str, f21, f22, 'evaluate')
self.assert_(result == False)
expr.set_use_numexpr(False)
testit()
expr.set_use_numexpr(True)
expr.set_numexpr_threads(1)
testit()
expr.set_numexpr_threads()
testit()
def test_where(self):
def testit():
for f in [ self.frame, self.frame2, self.mixed, self.mixed2 ]:
for cond in [ True, False ]:
c = np.empty(f.shape,dtype=np.bool_)
c.fill(cond)
result = expr.where(c, f.values, f.values+1)
expected = np.where(c, f.values, f.values+1)
assert_array_equal(result,expected)
expr.set_use_numexpr(False)
testit()
expr.set_use_numexpr(True)
expr.set_numexpr_threads(1)
testit()
expr.set_numexpr_threads()
testit()
if __name__ == '__main__':
import nose
nose.runmodule(argv=[__file__, '-vvs', '-x', '--pdb', '--pdb-failure'],
exit=False)
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