forked from Rust-related/RustPython
156 lines
4.5 KiB
Python
156 lines
4.5 KiB
Python
from testutils import assert_raises, assert_equal
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assert pow(3, 2) == 9
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assert pow(5, 3, 100) == 25
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assert pow(41, 7, 2) == 1
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assert pow(7, 2, 49) == 0
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assert pow(0, 0) == 1
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assert pow(2, 2) == 4
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assert pow(1, 2.0) == 1.0
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assert pow(2.0, 1) == 2.0
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assert pow(0, 10**1000) == 0
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assert pow(1, 10**1000) == 1
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assert pow(-1, 10**1000+1) == -1
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assert pow(-1, 10**1000) == 1
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assert pow(2, 4, 5) == 1
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assert_raises(TypeError, pow, 2, 4, 5.0)
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assert_raises(TypeError, pow, 2, 4.0, 5)
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assert_raises(TypeError, pow, 2.0, 4, 5)
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assert pow(2, -1, 5) == 3
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assert_raises(ValueError, pow, 2, 2, 0)
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assert_almost_equal = assert_equal
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def powtest(type):
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if type != float:
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for i in range(-1000, 1000):
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assert_equal(pow(type(i), 0), 1)
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assert_equal(pow(type(i), 1), type(i))
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assert_equal(pow(type(0), 1), type(0))
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assert_equal(pow(type(1), 1), type(1))
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for i in range(-100, 100):
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assert_equal(pow(type(i), 3), i * i * i)
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pow2 = 1
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for i in range(0, 31):
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assert_equal(pow(2, i), pow2)
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if i != 30:
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pow2 = pow2 * 2
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for othertype in (int,):
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for i in list(range(-10, 0)) + list(range(1, 10)):
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ii = type(i)
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for j in range(1, 11):
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jj = -othertype(j)
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pow(ii, jj)
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for othertype in int, float:
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for i in range(1, 100):
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zero = type(0)
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exp = -othertype(i / 10.0)
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if exp == 0:
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continue
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assert_raises(ZeroDivisionError, pow, zero, exp)
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il, ih = -20, 20
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jl, jh = -5, 5
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kl, kh = -10, 10
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asseq = assert_equal
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if type == float:
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il = 1
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asseq = assert_almost_equal
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elif type == int:
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jl = 0
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elif type == int:
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jl, jh = 0, 15
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for i in range(il, ih + 1):
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for j in range(jl, jh + 1):
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for k in range(kl, kh + 1):
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if k != 0:
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if type == float or j < 0:
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assert_raises(TypeError, pow, type(i), j, k)
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continue
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asseq(
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pow(type(i), j, k),
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pow(type(i), j) % type(k)
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)
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def test_powint():
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powtest(int)
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def test_powfloat():
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powtest(float)
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def test_other():
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# Other tests-- not very systematic
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assert_equal(pow(3,3) % 8, pow(3,3,8))
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assert_equal(pow(3,3) % -8, pow(3,3,-8))
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assert_equal(pow(3,2) % -2, pow(3,2,-2))
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assert_equal(pow(-3,3) % 8, pow(-3,3,8))
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assert_equal(pow(-3,3) % -8, pow(-3,3,-8))
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assert_equal(pow(5,2) % -8, pow(5,2,-8))
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assert_equal(pow(3,3) % 8, pow(3,3,8))
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assert_equal(pow(3,3) % -8, pow(3,3,-8))
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assert_equal(pow(3,2) % -2, pow(3,2,-2))
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assert_equal(pow(-3,3) % 8, pow(-3,3,8))
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assert_equal(pow(-3,3) % -8, pow(-3,3,-8))
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assert_equal(pow(5,2) % -8, pow(5,2,-8))
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for i in range(-10, 11):
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for j in range(0, 6):
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for k in range(-7, 11):
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if j >= 0 and k != 0:
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assert_equal(
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pow(i,j) % k,
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pow(i,j,k)
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)
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if j >= 0 and k != 0:
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assert_equal(
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pow(int(i),j) % k,
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pow(int(i),j,k)
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)
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def test_bug643260():
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class TestRpow:
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def __rpow__(self, other):
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return None
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None ** TestRpow() # Won't fail when __rpow__ invoked. SF bug #643260.
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def test_bug705231():
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# -1.0 raised to an integer should never blow up. It did if the
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# platform pow() was buggy, and Python didn't worm around it.
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eq = assert_equal
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a = -1.0
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# The next two tests can still fail if the platform floor()
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# function doesn't treat all large inputs as integers
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# test_math should also fail if that is happening
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eq(pow(a, 1.23e167), 1.0)
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eq(pow(a, -1.23e167), 1.0)
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for b in range(-10, 11):
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eq(pow(a, float(b)), b & 1 and -1.0 or 1.0)
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for n in range(0, 100):
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fiveto = float(5 ** n)
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# For small n, fiveto will be odd. Eventually we run out of
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# mantissa bits, though, and thereafer fiveto will be even.
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expected = fiveto % 2.0 and -1.0 or 1.0
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eq(pow(a, fiveto), expected)
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eq(pow(a, -fiveto), expected)
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eq(expected, 1.0) # else we didn't push fiveto to evenness
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tests = [f for name, f in locals().items() if name.startswith('test_')]
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for f in tests:
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f()
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