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