from __future__ import division, absolute_import, print_function
import sys
import pytest
import numpy as np
from numpy.testing import assert_, assert_equal
from numpy.core.tests._locales import CommaDecimalPointLocale
if sys.version_info[0] >= 3:
from io import StringIO
else:
from StringIO import StringIO
_REF = {np.inf: 'inf', -np.inf: '-inf', np.nan: 'nan'}
@pytest.mark.parametrize('tp', [np.float32, np.double, np.longdouble])
def test_float_types(tp):
""" Check formatting.
This is only for the str function, and only for simple types.
The precision of np.float32 and np.longdouble aren't the same as the
python float precision.
"""
for x in [0, 1, -1, 1e20]:
assert_equal(str(tp(x)), str(float(x)),
err_msg='Failed str formatting for type %s' % tp)
if tp(1e16).itemsize > 4:
assert_equal(str(tp(1e16)), str(float('1e16')),
err_msg='Failed str formatting for type %s' % tp)
else:
ref = '1e+16'
assert_equal(str(tp(1e16)), ref,
err_msg='Failed str formatting for type %s' % tp)
@pytest.mark.parametrize('tp', [np.float32, np.double, np.longdouble])
def test_nan_inf_float(tp):
""" Check formatting of nan & inf.
This is only for the str function, and only for simple types.
The precision of np.float32 and np.longdouble aren't the same as the
python float precision.
"""
for x in [np.inf, -np.inf, np.nan]:
assert_equal(str(tp(x)), _REF[x],
err_msg='Failed str formatting for type %s' % tp)
@pytest.mark.parametrize('tp', [np.complex64, np.cdouble, np.clongdouble])
def test_complex_types(tp):
"""Check formatting of complex types.
This is only for the str function, and only for simple types.
The precision of np.float32 and np.longdouble aren't the same as the
python float precision.
"""
for x in [0, 1, -1, 1e20]:
assert_equal(str(tp(x)), str(complex(x)),
err_msg='Failed str formatting for type %s' % tp)
assert_equal(str(tp(x*1j)), str(complex(x*1j)),
err_msg='Failed str formatting for type %s' % tp)
assert_equal(str(tp(x + x*1j)), str(complex(x + x*1j)),
err_msg='Failed str formatting for type %s' % tp)
if tp(1e16).itemsize > 8:
assert_equal(str(tp(1e16)), str(complex(1e16)),
err_msg='Failed str formatting for type %s' % tp)
else:
ref = '(1e+16+0j)'
assert_equal(str(tp(1e16)), ref,
err_msg='Failed str formatting for type %s' % tp)
@pytest.mark.parametrize('dtype', [np.complex64, np.cdouble, np.clongdouble])
def test_complex_inf_nan(dtype):
"""Check inf/nan formatting of complex types."""
TESTS = {
complex(np.inf, 0): "(inf+0j)",
complex(0, np.inf): "infj",
complex(-np.inf, 0): "(-inf+0j)",
complex(0, -np.inf): "-infj",
complex(np.inf, 1): "(inf+1j)",
complex(1, np.inf): "(1+infj)",
complex(-np.inf, 1): "(-inf+1j)",
complex(1, -np.inf): "(1-infj)",
complex(np.nan, 0): "(nan+0j)",
complex(0, np.nan): "nanj",
complex(-np.nan, 0): "(nan+0j)",
complex(0, -np.nan): "nanj",
complex(np.nan, 1): "(nan+1j)",
complex(1, np.nan): "(1+nanj)",
complex(-np.nan, 1): "(nan+1j)",
complex(1, -np.nan): "(1+nanj)",
}
for c, s in TESTS.items():
assert_equal(str(dtype(c)), s)
# print tests
def _test_redirected_print(x, tp, ref=None):
file = StringIO()
file_tp = StringIO()
stdout = sys.stdout
try:
sys.stdout = file_tp
print(tp(x))
sys.stdout = file
if ref:
print(ref)
else:
print(x)
finally:
sys.stdout = stdout
assert_equal(file.getvalue(), file_tp.getvalue(),
err_msg='print failed for type%s' % tp)
@pytest.mark.parametrize('tp', [np.float32, np.double, np.longdouble])
def test_float_type_print(tp):
"""Check formatting when using print """
for x in [0, 1, -1, 1e20]:
_test_redirected_print(float(x), tp)
for x in [np.inf, -np.inf, np.nan]:
_test_redirected_print(float(x), tp, _REF[x])
if tp(1e16).itemsize > 4:
_test_redirected_print(float(1e16), tp)
else:
ref = '1e+16'
_test_redirected_print(float(1e16), tp, ref)
@pytest.mark.parametrize('tp', [np.complex64, np.cdouble, np.clongdouble])
def test_complex_type_print(tp):
"""Check formatting when using print """
# We do not create complex with inf/nan directly because the feature is
# missing in python < 2.6
for x in [0, 1, -1, 1e20]:
_test_redirected_print(complex(x), tp)
if tp(1e16).itemsize > 8:
_test_redirected_print(complex(1e16), tp)
else:
ref = '(1e+16+0j)'
_test_redirected_print(complex(1e16), tp, ref)
_test_redirected_print(complex(np.inf, 1), tp, '(inf+1j)')
_test_redirected_print(complex(-np.inf, 1), tp, '(-inf+1j)')
_test_redirected_print(complex(-np.nan, 1), tp, '(nan+1j)')
def test_scalar_format():
"""Test the str.format method with NumPy scalar types"""
tests = [('{0}', True, np.bool_),
('{0}', False, np.bool_),
('{0:d}', 130, np.uint8),
('{0:d}', 50000, np.uint16),
('{0:d}', 3000000000, np.uint32),
('{0:d}', 15000000000000000000, np.uint64),
('{0:d}', -120, np.int8),
('{0:d}', -30000, np.int16),
('{0:d}', -2000000000, np.int32),
('{0:d}', -7000000000000000000, np.int64),
('{0:g}', 1.5, np.float16),
('{0:g}', 1.5, np.float32),
('{0:g}', 1.5, np.float64),
('{0:g}', 1.5, np.longdouble),
('{0:g}', 1.5+0.5j, np.complex64),
('{0:g}', 1.5+0.5j, np.complex128),
('{0:g}', 1.5+0.5j, np.clongdouble)]
for (fmat, val, valtype) in tests:
try:
assert_equal(fmat.format(val), fmat.format(valtype(val)),
"failed with val %s, type %s" % (val, valtype))
except ValueError as e:
assert_(False,
"format raised exception (fmt='%s', val=%s, type=%s, exc='%s')" %
(fmat, repr(val), repr(valtype), str(e)))
#
# Locale tests: scalar types formatting should be independent of the locale
#
class TestCommaDecimalPointLocale(CommaDecimalPointLocale):
def test_locale_single(self):
assert_equal(str(np.float32(1.2)), str(float(1.2)))
def test_locale_double(self):
assert_equal(str(np.double(1.2)), str(float(1.2)))
def test_locale_longdouble(self):
assert_equal(str(np.longdouble('1.2')), str(float(1.2)))