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Implement extended slicing in bytes objects.

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This commit is contained in:
Thomas Wouters 2006-12-19 08:30:14 +00:00
parent 5672904eff
commit 376446dd4e
2 changed files with 248 additions and 16 deletions
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31
Lib/test/test_bytes.py
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@ -163,6 +163,17 @@ class BytesTest(unittest.TestCase):
self.assertEqual(b[-5:100], by("world"))
self.assertEqual(b[-100:5], by("Hello"))
def test_extended_getslice(self):
# Test extended slicing by comparing with list slicing.
L = list(range(255))
b = bytes(L)
indices = (0, None, 1, 3, 19, 100, -1, -2, -31, -100)
for start in indices:
for stop in indices:
# Skip step 0 (invalid)
for step in indices[1:]:
self.assertEqual(b[start:stop:step], bytes(L[start:stop:step]))
def test_regexps(self):
def by(s):
return bytes(map(ord, s))
@ -239,6 +250,26 @@ class BytesTest(unittest.TestCase):
b[3:0] = [42, 42, 42]
self.assertEqual(b, bytes([0, 1, 2, 42, 42, 42, 3, 4, 5, 6, 7, 8, 9]))
def test_extended_set_del_slice(self):
indices = (0, None, 1, 3, 19, 300, -1, -2, -31, -300)
for start in indices:
for stop in indices:
# Skip invalid step 0
for step in indices[1:]:
L = list(range(255))
b = bytes(L)
# Make sure we have a slice of exactly the right length,
# but with different data.
data = L[start:stop:step]
data.reverse()
L[start:stop:step] = data
b[start:stop:step] = data
self.assertEquals(b, bytes(L))
del L[start:stop:step]
del b[start:stop:step]
self.assertEquals(b, bytes(L))
def test_setslice_trap(self):
# This test verifies that we correctly handle assigning self
# to a slice of self (the old Lambert Meertens trap).