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from decimal import Decimal
from sys import float_info
from django.test import SimpleTestCase
from django.utils.numberformat import format as nformat
class TestNumberFormat(SimpleTestCase):
def test_format_number(self):
self.assertEqual(nformat(1234, "."), "1234")
self.assertEqual(nformat(1234.2, "."), "1234.2")
self.assertEqual(nformat(1234, ".", decimal_pos=2), "1234.00")
self.assertEqual(nformat(1234, ".", grouping=2, thousand_sep=","), "1234")
self.assertEqual(
nformat(1234, ".", grouping=2, thousand_sep=",", force_grouping=True),
"12,34",
)
self.assertEqual(nformat(-1234.33, ".", decimal_pos=1), "-1234.3")
# The use_l10n parameter can force thousand grouping behavior.
with self.settings(USE_THOUSAND_SEPARATOR=True):
self.assertEqual(
nformat(1234, ".", grouping=3, thousand_sep=",", use_l10n=False), "1234"
)
self.assertEqual(
nformat(1234, ".", grouping=3, thousand_sep=",", use_l10n=True), "1,234"
)
def test_format_string(self):
self.assertEqual(nformat("1234", "."), "1234")
self.assertEqual(nformat("1234.2", "."), "1234.2")
self.assertEqual(nformat("1234", ".", decimal_pos=2), "1234.00")
self.assertEqual(nformat("1234", ".", grouping=2, thousand_sep=","), "1234")
self.assertEqual(
nformat("1234", ".", grouping=2, thousand_sep=",", force_grouping=True),
"12,34",
)
self.assertEqual(nformat("-1234.33", ".", decimal_pos=1), "-1234.3")
self.assertEqual(
nformat(
"10000", ".", grouping=3, thousand_sep="comma", force_grouping=True
),
"10comma000",
)
def test_large_number(self):
most_max = (
"{}179769313486231570814527423731704356798070567525844996"
"598917476803157260780028538760589558632766878171540458953"
"514382464234321326889464182768467546703537516986049910576"
"551282076245490090389328944075868508455133942304583236903"
"222948165808559332123348274797826204144723168738177180919"
"29988125040402618412485836{}"
)
most_max2 = (
"{}35953862697246314162905484746340871359614113505168999"
"31978349536063145215600570775211791172655337563430809179"
"07028764928468642653778928365536935093407075033972099821"
"15310256415249098018077865788815173701691026788460916647"
"38064458963316171186642466965495956524082894463374763543"
"61838599762500808052368249716736"
)
int_max = int(float_info.max)
self.assertEqual(nformat(int_max, "."), most_max.format("", "8"))
self.assertEqual(nformat(int_max + 1, "."), most_max.format("", "9"))
self.assertEqual(nformat(int_max * 2, "."), most_max2.format(""))
self.assertEqual(nformat(0 - int_max, "."), most_max.format("-", "8"))
self.assertEqual(nformat(-1 - int_max, "."), most_max.format("-", "9"))
self.assertEqual(nformat(-2 * int_max, "."), most_max2.format("-"))
def test_float_numbers(self):
tests = [
(9e-10, 10, "0.0000000009"),
(9e-19, 2, "0.00"),
(0.00000000000099, 0, "0"),
(0.00000000000099, 13, "0.0000000000009"),
(1e16, None, "10000000000000000"),
(1e16, 2, "10000000000000000.00"),
# A float without a fractional part (3.) results in a ".0" when no
# decimal_pos is given. Contrast that with the Decimal('3.') case
# in test_decimal_numbers which doesn't return a fractional part.
(3.0, None, "3.0"),
]
for value, decimal_pos, expected_value in tests:
with self.subTest(value=value, decimal_pos=decimal_pos):
self.assertEqual(nformat(value, ".", decimal_pos), expected_value)
# Thousand grouping behavior.
self.assertEqual(
nformat(1e16, ".", thousand_sep=",", grouping=3, force_grouping=True),
"10,000,000,000,000,000",
)
self.assertEqual(
nformat(
1e16,
".",
decimal_pos=2,
thousand_sep=",",
grouping=3,
force_grouping=True,
),
"10,000,000,000,000,000.00",
)
def test_decimal_numbers(self):
self.assertEqual(nformat(Decimal("1234"), "."), "1234")
self.assertEqual(nformat(Decimal("1234.2"), "."), "1234.2")
self.assertEqual(nformat(Decimal("1234"), ".", decimal_pos=2), "1234.00")
self.assertEqual(
nformat(Decimal("1234"), ".", grouping=2, thousand_sep=","), "1234"
)
self.assertEqual(
nformat(
Decimal("1234"), ".", grouping=2, thousand_sep=",", force_grouping=True
),
"12,34",
)
self.assertEqual(nformat(Decimal("-1234.33"), ".", decimal_pos=1), "-1234.3")
self.assertEqual(
nformat(Decimal("0.00000001"), ".", decimal_pos=8), "0.00000001"
)
self.assertEqual(nformat(Decimal("9e-19"), ".", decimal_pos=2), "0.00")
self.assertEqual(nformat(Decimal(".00000000000099"), ".", decimal_pos=0), "0")
self.assertEqual(
nformat(
Decimal("1e16"), ".", thousand_sep=",", grouping=3, force_grouping=True
),
"10,000,000,000,000,000",
)
self.assertEqual(
nformat(
Decimal("1e16"),
".",
decimal_pos=2,
thousand_sep=",",
grouping=3,
force_grouping=True,
),
"10,000,000,000,000,000.00",
)
self.assertEqual(nformat(Decimal("3."), "."), "3")
self.assertEqual(nformat(Decimal("3.0"), "."), "3.0")
# Very large & small numbers.
tests = [
("9e9999", None, "9e+9999"),
("9e9999", 3, "9.000e+9999"),
("9e201", None, "9e+201"),
("9e200", None, "9e+200"),
("1.2345e999", 2, "1.23e+999"),
("9e-999", None, "9e-999"),
("1e-7", 8, "0.00000010"),
("1e-8", 8, "0.00000001"),
("1e-9", 8, "0.00000000"),
("1e-10", 8, "0.00000000"),
("1e-11", 8, "0.00000000"),
("1" + ("0" * 300), 3, "1.000e+300"),
("0.{}1234".format("0" * 299), 3, "0.000"),
]
for value, decimal_pos, expected_value in tests:
with self.subTest(value=value):
self.assertEqual(
nformat(Decimal(value), ".", decimal_pos), expected_value
)
def test_decimal_subclass(self):
class EuroDecimal(Decimal):
"""
Wrapper for Decimal which prefixes each amount with the € symbol.
"""
def __format__(self, specifier, **kwargs):
amount = super().__format__(specifier, **kwargs)
return "€ {}".format(amount)
price = EuroDecimal("1.23")
self.assertEqual(nformat(price, ","), "€ 1,23")
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