56 lines
1.9 KiB
Python
56 lines
1.9 KiB
Python
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from __future__ import division
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# When true division is the default, get rid of this and add it to
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# test_long.py instead. In the meantime, it's too obscure to try to
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# trick just part of test_long into using future division.
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from test.test_support import TestFailed, verify, verbose
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def test_true_division():
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if verbose:
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print "long true division"
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huge = 1L << 40000
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mhuge = -huge
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verify(huge / huge == 1.0)
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verify(mhuge / mhuge == 1.0)
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verify(huge / mhuge == -1.0)
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verify(mhuge / huge == -1.0)
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verify(1 / huge == 0.0)
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verify(1L / huge == 0.0)
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verify(1 / mhuge == 0.0)
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verify(1L / mhuge == 0.0)
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verify((666 * huge + (huge >> 1)) / huge == 666.5)
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verify((666 * mhuge + (mhuge >> 1)) / mhuge == 666.5)
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verify((666 * huge + (huge >> 1)) / mhuge == -666.5)
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verify((666 * mhuge + (mhuge >> 1)) / huge == -666.5)
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verify(huge / (huge << 1) == 0.5)
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verify((1000000 * huge) / huge == 1000000)
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namespace = {'huge': huge, 'mhuge': mhuge}
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for overflow in ["float(huge)", "float(mhuge)",
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"huge / 1", "huge / 2L", "huge / -1", "huge / -2L",
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"mhuge / 100", "mhuge / 100L"]:
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try:
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eval(overflow, namespace)
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except OverflowError:
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pass
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else:
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raise TestFailed("expected OverflowError from %r" % overflow)
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for underflow in ["1 / huge", "2L / huge", "-1 / huge", "-2L / huge",
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"100 / mhuge", "100L / mhuge"]:
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result = eval(underflow, namespace)
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if result != 0.0:
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raise TestFailed("expected underflow to 0 from %r" % underflow)
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for zero in ["huge / 0", "huge / 0L",
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"mhuge / 0", "mhuge / 0L"]:
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try:
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eval(zero, namespace)
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except ZeroDivisionError:
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pass
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else:
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raise TestFailed("expected ZeroDivisionError from %r" % zero)
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test_true_division()
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