python · rhettinger · Oct 7, 2020 · Oct 7, 2020
diff --git a/Doc/library/decimal.rst b/Doc/library/decimal.rst
@@ -621,13 +621,6 @@ Decimal objects
  Return :const:`True` if the argument is either positive or negative
  infinity and :const:`False` otherwise.
 
- .. method:: is_integer()
-
- Return :const:`True` if the argument is a finite integral value and
-:const:`False` otherwise.
-
- .. versionadded:: 3.10
-
  .. method:: is_nan()
 
  Return :const:`True` if the argument is a (quiet or signaling) NaN and
@@ -1222,13 +1215,6 @@ In addition to the three supplied contexts, new contexts can be created with the
  Returns ``True`` if *x* is infinite; otherwise returns ``False``.
 
 
- .. method:: is_integer(x)
-
- Returns ``True`` if *x* is finite and integral; otherwise
- returns ``False``.
-
- .. versionadded:: 3.10
-
  .. method:: is_nan(x)
 
  Returns ``True`` if *x* is a qNaN or sNaN; otherwise returns ``False``.

diff --git a/Doc/library/numbers.rst b/Doc/library/numbers.rst
@@ -49,30 +49,19 @@ The numeric tower
  numbers.
 
  In short, those are: a conversion to :class:`float`, :func:`math.trunc`,
-:func:`round`, :func:`math.floor`, :func:`math.ceil`, :func:`divmod`,
-:func:`~Real.is_integer`, ``//``, ``%``, ``<``, ``<=``, ``>``, and ``>=``.
+:func:`round`, :func:`math.floor`, :func:`math.ceil`, :func:`divmod`, ``//``,
+ ``%``, ``<``, ``<=``, ``>``, and ``>=``.
 
  Real also provides defaults for :func:`complex`, :attr:`~Complex.real`,
 :attr:`~Complex.imag`, and :meth:`~Complex.conjugate`.
 
- .. method:: is_integer()
-
- Returns :const:`True` if this number has a finite and integral value,
- otherwise :const:`False`. This is a default implementation which
- relies on successful conversion to :class:`int`. It may be overridden
- in subclasses (such as it is in :class:`float`) for better performance,
- or to handle special values such as NaN which are not
- convertible to :class:`int`.
-
- .. versionadded:: 3.10
-
 
 .. class:: Rational
 
  Subtypes :class:`Real` and adds
 :attr:`~Rational.numerator` and :attr:`~Rational.denominator` properties, which
- should be in lowest terms. With these, it provides defaults for
-:func:`float` and :func:`~Real.is_integer`.
+ should be in lowest terms. With these, it provides a default for
+:func:`float`.
 
  .. attribute:: numerator
 
@@ -86,10 +75,9 @@ The numeric tower
 .. class:: Integral
 
  Subtypes :class:`Rational` and adds a conversion to :class:`int`. Provides
- defaults for :func:`float`, :attr:`~Rational.numerator`,
-:attr:`~Rational.denominator`, and :func:`~Real.is_integer`. Adds abstract
- methods for ``**`` and bit-string operations: ``<<``, ``>>``, ``&``, ``^``,
- ``|``, ``~``.
+ defaults for :func:`float`, :attr:`~Rational.numerator`, and
+:attr:`~Rational.denominator`. Adds abstract methods for ``**`` and
+ bit-string operations: ``<<``, ``>>``, ``&``, ``^``, ``|``, ``~``.
 
 
 Notes for type implementors

diff --git a/Doc/library/stdtypes.rst b/Doc/library/stdtypes.rst
@@ -310,10 +310,6 @@ the operations, see :ref:`operator-summary`):
 +---------------------+---------------------------------+---------+--------------------+
 | ``x ** y`` | *x* to the power *y* |\(5) ||
 +---------------------+---------------------------------+---------+--------------------+
-| ``x.is_integer()`` | ``True`` if *x* has a finite ||:func:`~numbers\ |
-|| and integral value, otherwise || .Real.is_integer` |
-|| ``False``. |||
-+---------------------+---------------------------------+---------+--------------------+
 
 .. index::
  triple: operations on; numeric; types
@@ -587,6 +583,16 @@ class`. float also has the following additional methods.
 :exc:`OverflowError` on infinities and a :exc:`ValueError` on
  NaNs.
 
+.. method:: float.is_integer()
+
+ Return ``True`` if the float instance is finite with integral
+ value, and ``False`` otherwise::
+
+ >>> (-2.0).is_integer()
+ True
+ >>> (3.2).is_integer()
+ False
+
 Two methods support conversion to
 and from hexadecimal strings. Since Python's floats are stored
 internally as binary numbers, converting a float to or from a

diff --git a/Lib/_pydecimal.py b/Lib/_pydecimal.py
@@ -3164,12 +3164,6 @@ def is_zero(self):
 """Return True if self is a zero; otherwise return False."""
 returnnotself._is_specialandself._int=='0'
 
-defis_integer(self):
-"""Return True is self is finite and integral; otherwise False."""
-ifself._is_special:
-returnFalse
-returnself.to_integral_value(rounding=ROUND_FLOOR) ==self
-
 def_ln_exp_bound(self):
 """Compute a lower bound for the adjusted exponent of self.ln().
  In other words, compute r such that self.ln() >= 10**r. Assumes
@@ -4665,25 +4659,6 @@ def is_zero(self, a):
 a=_convert_other(a, raiseit=True)
 returna.is_zero()
 
-defis_integer(self, a):
-"""Return True if the operand is integral; otherwise return False.
-
- >>> ExtendedContext.is_integer(Decimal('0'))
- True
- >>> ExtendedContext.is_integer(Decimal('2.50'))
- False
- >>> ExtendedContext.is_integer(Decimal('-0E+2'))
- True
- >>> ExtendedContext.is_integer(Decimal('-0.5'))
- False
- >>> ExtendedContext.is_integer(Decimal('NaN'))
- False
- >>> ExtendedContext.is_integer(10)
- True
- """
-a=_convert_other(a, raiseit=True)
-returna.is_integer()
-
 defln(self, a):
 """Returns the natural (base e) logarithm of the operand.
 

diff --git a/Lib/numbers.py b/Lib/numbers.py
@@ -148,7 +148,7 @@ class Real(Complex):
 """To Complex, Real adds the operations that work on real numbers.
 
  In short, those are: a conversion to float, trunc(), divmod,
-is_integer, %, <, <=, >, and >=.
+ %, <, <=, >, and >=.
 
  Real also provides defaults for the derived operations.
  """
@@ -242,17 +242,6 @@ def __le__(self, other):
 """self <= other"""
 raiseNotImplementedError
 
-defis_integer(self):
-"""Return True if the Real is integral; otherwise return False.
-
- This default implementation can be overridden in subclasses
- for performance reasons or to deal with values such as NaN,
- which would otherwise cause an exception to be raised.
- """
-# Although __int__ is not defined at this level, the int
-# constructor falls back to __trunc__, which we do have.
-returnself==int(self)
-
 # Concrete implementations of Complex abstract methods.
 def__complex__(self):
 """complex(self) == complex(float(self), 0)"""
@@ -301,10 +290,6 @@ def __float__(self):
  """
 returnself.numerator/self.denominator
 
-defis_integer(self):
-"""Return True if the Rational is integral; otherwise return False."""
-returnself.denominator==1
-
 
 classIntegral(Rational):
 """Integral adds a conversion to int and the bit-string operations."""
@@ -401,8 +386,4 @@ def denominator(self):
 """Integers have a denominator of 1."""
 return1
 
-defis_integer(self):
-"""Return True; all Integrals represent an integral value."""
-returnTrue
-
 Integral.register(int)
diff --git a/Lib/test/decimaltestdata/extra.decTest b/Lib/test/decimaltestdata/extra.decTest
@@ -2346,24 +2346,6 @@ bool2096 iszero sNaN -> 0
 bool2097 iszero -sNaN -> 0
 bool2098 iszero sNaN123 -> 0
 bool2099 iszero -sNaN123 -> 0
-bool2100 is_integer -1.0 -> 1
-bool2101 is_integer 0.0 -> 1
-bool2102 is_integer 1.0 -> 1
-bool2103 is_integer 42 -> 1
-bool2104 is_integer 1e2 -> 1
-bool2105 is_integer 1.5 -> 0
-bool2106 is_integer 1e-2 -> 0
-bool2107 is_integer NaN -> 0
-bool2109 is_integer -NaN -> 0
-bool2110 is_integer NaN123 -> 0
-bool2111 is_integer -NaN123 -> 0
-bool2112 is_integer sNaN -> 0
-bool2113 is_integer -sNaN -> 0
-bool2114 is_integer sNaN123 -> 0
-bool2115 is_integer -sNaN123 -> 0
-bool2116 is_integer Infinity -> 0
-bool2117 is_integer -Infinity -> 0
-
 
 ------------------------------------------------------------------------
 -- The following tests (pwmx0 through pwmx440) are for the --

diff --git a/Lib/test/test_bool.py b/Lib/test/test_bool.py
@@ -354,11 +354,6 @@ def test_real_and_imag(self):
 self.assertIs(type(False.real), int)
 self.assertIs(type(False.imag), int)
 
-deftest_always_is_integer(self):
-# Issue #26680: Incorporating number.is_integer into bool
-self.assertTrue(all(b.is_integer() forbin (False, True)))
-
-
 deftest_main():
 support.run_unittest(BoolTest)
 

diff --git a/Lib/test/test_decimal.py b/Lib/test/test_decimal.py
@@ -276,7 +276,6 @@ def setUp(self):
 'is_snan',
 'is_subnormal',
 'is_zero',
-'is_integer',
 'same_quantum')
 
 defread_unlimited(self, v, context):
@@ -2727,7 +2726,6 @@ def test_named_parameters(self):
 self.assertRaises(TypeError, D(1).is_snan, context=xc)
 self.assertRaises(TypeError, D(1).is_signed, context=xc)
 self.assertRaises(TypeError, D(1).is_zero, context=xc)
-self.assertRaises(TypeError, D(1).is_integer, context=xc)
 
 self.assertFalse(D("0.01").is_normal(context=xc))
 self.assertTrue(D("0.01").is_subnormal(context=xc))
@@ -3199,15 +3197,6 @@ def test_is_zero(self):
 self.assertEqual(c.is_zero(10), d)
 self.assertRaises(TypeError, c.is_zero, '10')
 
-deftest_is_integer(self):
-Decimal=self.decimal.Decimal
-Context=self.decimal.Context
-
-c=Context()
-b=c.is_integer(Decimal(10))
-self.assertEqual(c.is_integer(10), b)
-self.assertRaises(TypeError, c.is_integer, '10')
-
 deftest_ln(self):
 Decimal=self.decimal.Decimal
 Context=self.decimal.Context
@@ -4371,19 +4360,6 @@ def test_implicit_context(self):
 self.assertTrue(Decimal("-1").is_signed())
 self.assertTrue(Decimal("0").is_zero())
 self.assertTrue(Decimal("0").is_zero())
-self.assertTrue(Decimal("-1").is_integer())
-self.assertTrue(Decimal("0").is_integer())
-self.assertTrue(Decimal("1").is_integer())
-self.assertTrue(Decimal("42").is_integer())
-self.assertTrue(Decimal("1e2").is_integer())
-self.assertFalse(Decimal("1.5").is_integer())
-self.assertFalse(Decimal("1e-2").is_integer())
-self.assertFalse(Decimal("NaN").is_integer())
-self.assertFalse(Decimal("-NaN").is_integer())
-self.assertFalse(Decimal("sNaN").is_integer())
-self.assertFalse(Decimal("-sNaN").is_integer())
-self.assertFalse(Decimal("Inf").is_integer())
-self.assertFalse(Decimal("-Inf").is_integer())
 
 # Copy
 withlocalcontext() asc:

diff --git a/Lib/test/test_fractions.py b/Lib/test/test_fractions.py
@@ -724,17 +724,6 @@ def denominator(self):
 self.assertEqual(type(f.numerator), myint)
 self.assertEqual(type(f.denominator), myint)
 
-deftest_is_integer(self):
-# Issue #26680: Incorporating number.is_integer into Fraction
-self.assertTrue(F(-1, 1).is_integer())
-self.assertTrue(F(0, 1).is_integer())
-self.assertTrue(F(1, 1).is_integer())
-self.assertTrue(F(42, 1).is_integer())
-self.assertTrue(F(2, 2).is_integer())
-self.assertTrue(F(8, 4).is_integer())
-self.assertFalse(F(1, 2).is_integer())
-self.assertFalse(F(1, 3).is_integer())
-self.assertFalse(F(2, 3).is_integer())
 
 if__name__=='__main__':
 unittest.main()
diff --git a/Lib/test/test_long.py b/Lib/test/test_long.py
@@ -1381,10 +1381,6 @@ class myint(int):
 self.assertEqual(type(numerator), int)
 self.assertEqual(type(denominator), int)
 
-deftest_int_always_is_integer(self):
-# Issue #26680: Incorporating number.is_integer into int
-self.assertTrue(all(x.is_integer() forxin (-1, 0, 1, 42)))
-
 
 if__name__=="__main__":
 unittest.main()
diff --git a/Lib/test/test_numeric_tower.py b/Lib/test/test_numeric_tower.py
@@ -6,7 +6,6 @@
 importsys
 importoperator
 
-fromnumbersimportReal, Rational, Integral
 fromdecimalimportDecimalasD
 fromfractionsimportFractionasF
 
@@ -199,35 +198,5 @@ def test_complex(self):
 self.assertRaises(TypeError, op, v, z)
 
 
-classIsIntegerTest(unittest.TestCase):
-
-deftest_real_is_integer(self):
-self.assertTrue(Real.is_integer(-1.0))
-self.assertTrue(Real.is_integer(0.0))
-self.assertTrue(Real.is_integer(1.0))
-self.assertTrue(Real.is_integer(42.0))
-
-self.assertFalse(Real.is_integer(-0.5))
-self.assertFalse(Real.is_integer(4.2))
-
-deftest_rational_is_integer(self):
-self.assertTrue(Rational.is_integer(F(-1, 1)))
-self.assertTrue(Rational.is_integer(F(0, 1)))
-self.assertTrue(Rational.is_integer(F(1, 1)))
-self.assertTrue(Rational.is_integer(F(42, 1)))
-self.assertTrue(Rational.is_integer(F(2, 2)))
-self.assertTrue(Rational.is_integer(F(8, 4)))
-
-self.assertFalse(Rational.is_integer(F(1, 2)))
-self.assertFalse(Rational.is_integer(F(1, 3)))
-self.assertFalse(Rational.is_integer(F(2, 3)))
-
-deftest_integral_is_integer(self):
-self.assertTrue(Integral.is_integer(-1))
-self.assertTrue(Integral.is_integer(0))
-self.assertTrue(Integral.is_integer(1))
-self.assertTrue(Integral.is_integer(1729))
-
-
 if__name__=='__main__':
 unittest.main()
diff --git a/Misc/ACKS b/Misc/ACKS
@@ -1612,7 +1612,6 @@ Roman Skurikhin
 Ville Skyttä
 Michael Sloan
 Nick Sloan
-Robert Smallshire
 Václav Šmilauer
 Allen W. Smith
 Christopher Smith

diff --git a/Modules/_decimal/_decimal.c b/Modules/_decimal/_decimal.c
@@ -4138,7 +4138,6 @@ Dec_BoolFunc(mpd_isqnan)
 Dec_BoolFunc(mpd_issnan)
 Dec_BoolFunc(mpd_issigned)
 Dec_BoolFunc(mpd_iszero)
-Dec_BoolFunc(mpd_isinteger)
 
 /* Boolean functions, optional context arg */
 Dec_BoolFuncVA(mpd_isnormal)
@@ -4773,7 +4772,6 @@ static PyMethodDef dec_methods [] =
 {"is_snan", dec_mpd_issnan, METH_NOARGS, doc_is_snan },
 {"is_signed", dec_mpd_issigned, METH_NOARGS, doc_is_signed },
 {"is_zero", dec_mpd_iszero, METH_NOARGS, doc_is_zero },
-{"is_integer", dec_mpd_isinteger, METH_NOARGS, doc_is_integer},
 
 /* Boolean functions, optional context arg */
 {"is_normal", (PyCFunction)(void(*)(void))dec_mpd_isnormal, METH_VARARGS|METH_KEYWORDS, doc_is_normal },
@@ -5185,7 +5183,6 @@ DecCtx_BoolFunc_NO_CTX(mpd_isqnan)
 DecCtx_BoolFunc_NO_CTX(mpd_issigned)
 DecCtx_BoolFunc_NO_CTX(mpd_issnan)
 DecCtx_BoolFunc_NO_CTX(mpd_iszero)
-DecCtx_BoolFunc_NO_CTX(mpd_isinteger)
 
 staticPyObject*
 ctx_iscanonical(PyObject*contextUNUSED, PyObject*v)
@@ -5467,7 +5464,6 @@ static PyMethodDef context_methods [] =
 {"is_snan", ctx_mpd_issnan, METH_O, doc_ctx_is_snan },
 {"is_subnormal", ctx_mpd_issubnormal, METH_O, doc_ctx_is_subnormal },
 {"is_zero", ctx_mpd_iszero, METH_O, doc_ctx_is_zero },
-{"is_integer", ctx_mpd_isinteger, METH_O, doc_ctx_is_integer },
 
 /* Functions with a single decimal argument */
 {"_apply", PyDecContext_Apply, METH_O, NULL }, /* alias for apply */
@@ -6101,3 +6097,5 @@ PyInit__decimal(void)
 
 returnNULL; /* GCOV_NOT_REACHED */
 }
+
+