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Update test_format.py from Cpython v3.11.2 #4825

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Apr 2, 2023
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Update test_format.py from Cpython v3.11.2 #4825

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155 changes: 152 additions & 3 deletions Lib/test/test_format.py
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
from test.support import verbose, TestFailed
import locale
import sys
import re
import test.support as support
import unittest

Expand Down Expand Up @@ -248,7 +249,7 @@ def test_common_format(self):
# base marker shouldn't change the size
testcommon("%0#35.33o", big, "0o012345670123456701234567012345670")

# Some small ints, in both Python int and flavors).
# Some small ints, in both Python int and flavors.
testcommon("%d", 42, "42")
testcommon("%d", -42, "-42")
testcommon("%d", 42.0, "42")
Expand All @@ -274,9 +275,9 @@ def test_common_format(self):
test_exc_common('% %s', 1, ValueError,
"unsupported format character '%' (0x25) at index 2")
test_exc_common('%d', '1', TypeError,
"%d format: a number is required, not str")
"%d format: a real number is required, not str")
test_exc_common('%d', b'1', TypeError,
"%d format: a number is required, not bytes")
"%d format: a real number is required, not bytes")
test_exc_common('%x', '1', TypeError,
"%x format: an integer is required, not str")
test_exc_common('%x', 3.14, TypeError,
Expand Down Expand Up @@ -493,6 +494,154 @@ def test_precision_c_limits(self):
with self.assertRaises(ValueError) as cm:
format(c, ".%sf" % (INT_MAX + 1))

def test_g_format_has_no_trailing_zeros(self):
# regression test for bugs.python.org/issue40780
self.assertEqual("%.3g" % 1505.0, "1.5e+03")
self.assertEqual("%#.3g" % 1505.0, "1.50e+03")

self.assertEqual(format(1505.0, ".3g"), "1.5e+03")
self.assertEqual(format(1505.0, "#.3g"), "1.50e+03")

self.assertEqual(format(12300050.0, ".6g"), "1.23e+07")
self.assertEqual(format(12300050.0, "#.6g"), "1.23000e+07")

# TODO: RUSTPYTHON
@unittest.expectedFailure
def test_with_two_commas_in_format_specifier(self):
error_msg = re.escape("Cannot specify ',' with ','.")
with self.assertRaisesRegex(ValueError, error_msg):
'{:,,}'.format(1)

# TODO: RUSTPYTHON
@unittest.expectedFailure
def test_with_two_underscore_in_format_specifier(self):
error_msg = re.escape("Cannot specify '_' with '_'.")
with self.assertRaisesRegex(ValueError, error_msg):
'{:__}'.format(1)

# TODO: RUSTPYTHON
@unittest.expectedFailure
def test_with_a_commas_and_an_underscore_in_format_specifier(self):
error_msg = re.escape("Cannot specify both ',' and '_'.")
with self.assertRaisesRegex(ValueError, error_msg):
'{:,_}'.format(1)

# TODO: RUSTPYTHON
@unittest.expectedFailure
def test_with_an_underscore_and_a_comma_in_format_specifier(self):
error_msg = re.escape("Cannot specify both ',' and '_'.")
with self.assertRaisesRegex(ValueError, error_msg):
'{:_,}'.format(1)

# TODO: RUSTPYTHON
@unittest.expectedFailure
def test_better_error_message_format(self):
# https://bugs.python.org/issue20524
for value in [12j, 12, 12.0, "12"]:
with self.subTest(value=value):
# The format spec must be invalid for all types we're testing.
# '%M' will suffice.
bad_format_spec = '%M'
err = re.escape("Invalid format specifier "
f"'{bad_format_spec}' for object of type "
f"'{type(value).__name__}'")
with self.assertRaisesRegex(ValueError, err):
f"xx{{value:{bad_format_spec}}}yy".format(value=value)

# Also test the builtin format() function.
with self.assertRaisesRegex(ValueError, err):
format(value, bad_format_spec)

# Also test f-strings.
with self.assertRaisesRegex(ValueError, err):
eval("f'xx{value:{bad_format_spec}}yy'")

# TODO: RUSTPYTHON
@unittest.expectedFailure
def test_unicode_in_error_message(self):
str_err = re.escape(
"Invalid format specifier '%ЫйЯЧ' for object of type 'str'")
with self.assertRaisesRegex(ValueError, str_err):
"{a:%ЫйЯЧ}".format(a='a')

# TODO: RUSTPYTHON
@unittest.expectedFailure
def test_negative_zero(self):
## default behavior
self.assertEqual(f"{-0.:.1f}", "-0.0")
self.assertEqual(f"{-.01:.1f}", "-0.0")
self.assertEqual(f"{-0:.1f}", "0.0") # integers do not distinguish -0

## z sign option
self.assertEqual(f"{0.:z.1f}", "0.0")
self.assertEqual(f"{0.:z6.1f}", " 0.0")
self.assertEqual(f"{-1.:z6.1f}", " -1.0")
self.assertEqual(f"{-0.:z.1f}", "0.0")
self.assertEqual(f"{.01:z.1f}", "0.0")
self.assertEqual(f"{-0:z.1f}", "0.0") # z is allowed for integer input
self.assertEqual(f"{-.01:z.1f}", "0.0")
self.assertEqual(f"{0.:z.2f}", "0.00")
self.assertEqual(f"{-0.:z.2f}", "0.00")
self.assertEqual(f"{.001:z.2f}", "0.00")
self.assertEqual(f"{-.001:z.2f}", "0.00")

self.assertEqual(f"{0.:z.1e}", "0.0e+00")
self.assertEqual(f"{-0.:z.1e}", "0.0e+00")
self.assertEqual(f"{0.:z.1E}", "0.0E+00")
self.assertEqual(f"{-0.:z.1E}", "0.0E+00")

self.assertEqual(f"{-0.001:z.2e}", "-1.00e-03") # tests for mishandled
# rounding
self.assertEqual(f"{-0.001:z.2g}", "-0.001")
self.assertEqual(f"{-0.001:z.2%}", "-0.10%")

self.assertEqual(f"{-00000.000001:z.1f}", "0.0")
self.assertEqual(f"{-00000.:z.1f}", "0.0")
self.assertEqual(f"{-.0000000000:z.1f}", "0.0")

self.assertEqual(f"{-00000.000001:z.2f}", "0.00")
self.assertEqual(f"{-00000.:z.2f}", "0.00")
self.assertEqual(f"{-.0000000000:z.2f}", "0.00")

self.assertEqual(f"{.09:z.1f}", "0.1")
self.assertEqual(f"{-.09:z.1f}", "-0.1")

self.assertEqual(f"{-0.: z.0f}", " 0")
self.assertEqual(f"{-0.:+z.0f}", "+0")
self.assertEqual(f"{-0.:-z.0f}", "0")
self.assertEqual(f"{-1.: z.0f}", "-1")
self.assertEqual(f"{-1.:+z.0f}", "-1")
self.assertEqual(f"{-1.:-z.0f}", "-1")

self.assertEqual(f"{0.j:z.1f}", "0.0+0.0j")
self.assertEqual(f"{-0.j:z.1f}", "0.0+0.0j")
self.assertEqual(f"{.01j:z.1f}", "0.0+0.0j")
self.assertEqual(f"{-.01j:z.1f}", "0.0+0.0j")

self.assertEqual(f"{-0.:z>6.1f}", "zz-0.0") # test fill, esp. 'z' fill
self.assertEqual(f"{-0.:z>z6.1f}", "zzz0.0")
self.assertEqual(f"{-0.:x>z6.1f}", "xxx0.0")
self.assertEqual(f"{-0.:🖤>z6.1f}", "🖤🖤🖤0.0") # multi-byte fill char

# TODO: RUSTPYTHON
@unittest.expectedFailure
def test_specifier_z_error(self):
error_msg = re.compile("Invalid format specifier '.*z.*'")
with self.assertRaisesRegex(ValueError, error_msg):
f"{0:z+f}" # wrong position
with self.assertRaisesRegex(ValueError, error_msg):
f"{0:fz}" # wrong position

error_msg = re.escape("Negative zero coercion (z) not allowed")
with self.assertRaisesRegex(ValueError, error_msg):
f"{0:zd}" # can't apply to int presentation type
with self.assertRaisesRegex(ValueError, error_msg):
f"{'x':zs}" # can't apply to string

error_msg = re.escape("unsupported format character 'z'")
with self.assertRaisesRegex(ValueError, error_msg):
"%z.1f" % 0 # not allowed in old style string interpolation


if __name__ == "__main__":
unittest.main()