Python operator.length_hint() Examples
The following are 27
code examples of operator.length_hint().
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Example #1
| Source File: test_enumerate.py From android_universal with MIT License | 6 votes |
|
def test_len(self):
for s in ('hello', tuple('hello'), list('hello'), range(5)):
self.assertEqual(operator.length_hint(reversed(s)), len(s))
r = reversed(s)
list(r)
self.assertEqual(operator.length_hint(r), 0)
class SeqWithWeirdLen:
called = False
def __len__(self):
if not self.called:
self.called = True
return 10
raise ZeroDivisionError
def __getitem__(self, index):
return index
r = reversed(SeqWithWeirdLen())
self.assertRaises(ZeroDivisionError, operator.length_hint, r)
Example #2
| Source File: log.py From OpenNIR with MIT License | 6 votes |
|
def pbar_raw(self, *args, **kwargs):
level = kwargs.pop('level', 'DEBUG')
quiet = kwargs.pop('quiet', False)
if 'total' not in kwargs and 'total_from' in kwargs:
total_from = kwargs.pop('total_from')
if hasattr(total_from, '__len__'):
kwargs['total'] = len(total_from)
elif hasattr(total_from, '__length_hint__'):
kwargs['total'] = operator.length_hint(total_from)
else:
raise ValueError('total_from does not have __len__ or __length_hint__')
if 'ncols' not in kwargs:
kwargs['ncols'] = 80
if 'desc' in kwargs:
if not quiet:
self.log(level, '[starting] {desc}'.format(**kwargs))
if 'leave' not in kwargs:
kwargs['leave'] = False
if 'smoothing' not in kwargs:
kwargs['smoothing'] = 0. # disable smoothing by default; mean over entire life of pbar
with tqdm(*args, **kwargs) as pbar:
yield pbar
if not quiet:
pbar.bar_format = '{desc}: [{elapsed}] [{n_fmt}it] [{rate_fmt}]'
self.log(level, '[finished] ' + str(pbar))
Example #3
| Source File: log.py From OpenNIR with MIT License | 6 votes |
|
def pbar(self, it, *args, **kwargs):
level = kwargs.pop('level', 'DEBUG')
quiet = kwargs.pop('quiet', False)
if 'ncols' not in kwargs:
kwargs['ncols'] = 80
if 'desc' in kwargs:
if not quiet:
self.log(level, '[starting] {desc}'.format(**kwargs))
if 'leave' not in kwargs:
kwargs['leave'] = False
if 'total' not in kwargs and hasattr(it, '__len__'):
kwargs['total'] = len(it)
elif 'total' not in kwargs and hasattr(it, '__length_hint__'):
kwargs['total'] = operator.length_hint(it)
if 'smoothing' not in kwargs:
kwargs['smoothing'] = 0. # disable smoothing by default; mean over entire life of pbar
pbar = tqdm(it, *args, **kwargs)
yield from pbar
if not quiet:
pbar.bar_format = '{desc}: [{elapsed}] [{n_fmt}it] [{rate_fmt}]'
self.log(level, '[finished] ' + str(pbar))
Example #4
| Source File: test_enumerate.py From ironpython3 with Apache License 2.0 | 6 votes |
|
def test_len(self):
for s in ('hello', tuple('hello'), list('hello'), range(5)):
self.assertEqual(operator.length_hint(reversed(s)), len(s))
r = reversed(s)
list(r)
self.assertEqual(operator.length_hint(r), 0)
class SeqWithWeirdLen:
called = False
def __len__(self):
if not self.called:
self.called = True
return 10
raise ZeroDivisionError
def __getitem__(self, index):
return index
r = reversed(SeqWithWeirdLen())
if sys.implementation.name == "ironpython": # this seems like an implementation detail?
self.assertEqual(operator.length_hint(r), 10)
else:
self.assertRaises(ZeroDivisionError, operator.length_hint, r)
Example #5
| Source File: test_enumerate.py From Project-New-Reign---Nemesis-Main with GNU General Public License v3.0 | 6 votes |
|
def test_len(self):
for s in ('hello', tuple('hello'), list('hello'), range(5)):
self.assertEqual(operator.length_hint(reversed(s)), len(s))
r = reversed(s)
list(r)
self.assertEqual(operator.length_hint(r), 0)
class SeqWithWeirdLen:
called = False
def __len__(self):
if not self.called:
self.called = True
return 10
raise ZeroDivisionError
def __getitem__(self, index):
return index
r = reversed(SeqWithWeirdLen())
self.assertRaises(ZeroDivisionError, operator.length_hint, r)
Example #6
| Source File: test_enumerate.py From Fluid-Designer with GNU General Public License v3.0 | 6 votes |
|
def test_len(self):
for s in ('hello', tuple('hello'), list('hello'), range(5)):
self.assertEqual(operator.length_hint(reversed(s)), len(s))
r = reversed(s)
list(r)
self.assertEqual(operator.length_hint(r), 0)
class SeqWithWeirdLen:
called = False
def __len__(self):
if not self.called:
self.called = True
return 10
raise ZeroDivisionError
def __getitem__(self, index):
return index
r = reversed(SeqWithWeirdLen())
self.assertRaises(ZeroDivisionError, operator.length_hint, r)
Example #7
| Source File: test_struct.py From ironpython3 with Apache License 2.0 | 6 votes |
|
def test_iter_unpack(self):
import operator
packed = struct.pack('hlhlhl', 1, 2, 3, 4, 5, 6)
it = struct.iter_unpack('hl', packed)
self.assertEqual(operator.length_hint(it), 3)
self.assertEqual(it.__next__(), (1, 2))
self.assertEqual(operator.length_hint(it), 2)
self.assertEqual(it.__next__(), (3, 4))
self.assertEqual(operator.length_hint(it), 1)
self.assertEqual(it.__next__(), (5, 6))
self.assertEqual(operator.length_hint(it), 0)
self.assertRaises(StopIteration, next, it)
# struct.error: iterative unpacking requires a buffer of a multiple of {N} bytes
self.assertRaises(struct.error, struct.iter_unpack, "h", b"\0")
Example #8
| Source File: test_iterlen.py From ironpython3 with Apache License 2.0 | 5 votes |
|
def test_mutation(self):
d = list(range(n))
it = reversed(d)
next(it)
next(it)
self.assertEqual(length_hint(it), n - 2)
d.append(n)
self.assertEqual(length_hint(it), n - 2) # ignore append
d[1:] = []
self.assertEqual(length_hint(it), 0)
self.assertEqual(list(it), []) # confirm invariant
d.extend(range(20))
self.assertEqual(length_hint(it), 0)
## -- Check to make sure exceptions are not suppressed by __length_hint__()
Example #9
| Source File: test_iterlen.py From Project-New-Reign---Nemesis-Main with GNU General Public License v3.0 | 5 votes |
|
def test_mutation(self):
d = list(range(n))
it = reversed(d)
next(it)
next(it)
self.assertEqual(length_hint(it), n - 2)
d.append(n)
self.assertEqual(length_hint(it), n - 2) # ignore append
d[1:] = []
self.assertEqual(length_hint(it), 0)
self.assertEqual(list(it), []) # confirm invariant
d.extend(range(20))
self.assertEqual(length_hint(it), 0)
## -- Check to make sure exceptions are not suppressed by __length_hint__()
Example #10
| Source File: test_iterlen.py From Project-New-Reign---Nemesis-Main with GNU General Public License v3.0 | 5 votes |
|
def test_mutation(self):
d = list(range(n))
it = iter(d)
next(it)
next(it)
self.assertEqual(length_hint(it), n - 2)
d.append(n)
self.assertEqual(length_hint(it), n - 1) # grow with append
d[1:] = []
self.assertEqual(length_hint(it), 0)
self.assertEqual(list(it), [])
d.extend(range(20))
self.assertEqual(length_hint(it), 0)
Example #11
| Source File: test_iterlen.py From Project-New-Reign---Nemesis-Main with GNU General Public License v3.0 | 5 votes |
|
def test_invariant(self):
it = self.it
for i in reversed(range(1, n+1)):
self.assertEqual(length_hint(it), i)
next(it)
self.assertEqual(length_hint(it), 0)
self.assertRaises(StopIteration, next, it)
self.assertEqual(length_hint(it), 0)
Example #12
| Source File: test_itertools.py From Project-New-Reign---Nemesis-Main with GNU General Public License v3.0 | 5 votes |
|
def test_repeat_with_negative_times(self):
self.assertEqual(operator.length_hint(repeat(None, -1)), 0)
self.assertEqual(operator.length_hint(repeat(None, -2)), 0)
self.assertEqual(operator.length_hint(repeat(None, times=-1)), 0)
self.assertEqual(operator.length_hint(repeat(None, times=-2)), 0)
Example #13
| Source File: test_itertools.py From Project-New-Reign---Nemesis-Main with GNU General Public License v3.0 | 5 votes |
|
def test_repeat(self):
self.assertEqual(operator.length_hint(repeat(None, 50)), 50)
self.assertEqual(operator.length_hint(repeat(None, 0)), 0)
self.assertEqual(operator.length_hint(repeat(None), 12), 12)
Example #14
| Source File: test_struct.py From Project-New-Reign---Nemesis-Main with GNU General Public License v3.0 | 5 votes |
|
def test_length_hint(self):
lh = operator.length_hint
s = struct.Struct('>IB')
b = bytes(range(1, 16))
it = s.iter_unpack(b)
self.assertEqual(lh(it), 3)
next(it)
self.assertEqual(lh(it), 2)
next(it)
self.assertEqual(lh(it), 1)
next(it)
self.assertEqual(lh(it), 0)
self.assertRaises(StopIteration, next, it)
self.assertEqual(lh(it), 0)
Example #15
| Source File: iter.py From sidekick with MIT License | 5 votes |
|
def __length_hint__(self, _hint=operator.length_hint):
if self._size_hint is NotImplemented:
return _hint(self._iterator, NotImplemented)
return self._size_hint
#
# API
#
Example #16
| Source File: iter.py From sidekick with MIT License | 5 votes |
|
def __getitem__(self, item, _chain=itertools.chain):
if isinstance(item, int):
if item >= 0:
head = []
for i, x in enumerate(self._iterator):
head.append(x)
if i == item:
self._iterator = _chain(head, self._iterator)
return x
else:
self._iterator = _iter(head)
self._size_hint = len(head)
raise IndexError(item)
else:
raise IndexError("negative indexes are not supported")
elif isinstance(item, slice):
a, b, c = item.start, item.step, item.stop
return iter(itertools.islice(self._iterator, a, b, c))
elif callable(item):
return iter(filter(item, self._iterator), self._size_hint)
elif isinstance(item, list):
if not item:
return []
if isinstance(item[0], bool):
self._iterator, data = itertools.tee(self._iterator, 2)
return [x for key, x in zip(item, data) if key]
elif isinstance(item[0], int):
self._iterator, data = itertools.tee(self._iterator, 2)
data = list(itertools.islice(data, max(item) + 1))
return [data[i] for i in item]
else:
raise TypeError("index must contain only integers or booleans")
else:
size = operator.length_hint(item, -1)
size = None if size == -1 else size
return iter(compress_or_select(item, self._iterator), size)
Example #17
| Source File: test_iterlen.py From ironpython3 with Apache License 2.0 | 5 votes |
|
def test_mutation(self):
d = list(range(n))
it = iter(d)
next(it)
next(it)
self.assertEqual(length_hint(it), n - 2)
d.append(n)
self.assertEqual(length_hint(it), n - 1) # grow with append
d[1:] = []
self.assertEqual(length_hint(it), 0)
self.assertEqual(list(it), [])
d.extend(range(20))
self.assertEqual(length_hint(it), 0)
Example #18
| Source File: test_iterlen.py From ironpython3 with Apache License 2.0 | 5 votes |
|
def test_invariant(self):
it = self.it
for i in reversed(range(1, n+1)):
self.assertEqual(length_hint(it), i)
next(it)
self.assertEqual(length_hint(it), 0)
self.assertRaises(StopIteration, next, it)
self.assertEqual(length_hint(it), 0)
Example #19
| Source File: test_itertools.py From ironpython3 with Apache License 2.0 | 5 votes |
|
def test_repeat_with_negative_times(self):
self.assertEqual(operator.length_hint(repeat(None, -1)), 0)
self.assertEqual(operator.length_hint(repeat(None, -2)), 0)
self.assertEqual(operator.length_hint(repeat(None, times=-1)), 0)
self.assertEqual(operator.length_hint(repeat(None, times=-2)), 0)
Example #20
| Source File: test_itertools.py From ironpython3 with Apache License 2.0 | 5 votes |
|
def test_repeat(self):
self.assertEqual(operator.length_hint(repeat(None, 50)), 50)
self.assertEqual(operator.length_hint(repeat(None, 0)), 0)
self.assertEqual(operator.length_hint(repeat(None), 12), 12)
Example #21
| Source File: test_struct.py From ironpython3 with Apache License 2.0 | 5 votes |
|
def test_length_hint(self):
lh = operator.length_hint
s = struct.Struct('>IB')
b = bytes(range(1, 16))
it = s.iter_unpack(b)
self.assertEqual(lh(it), 3)
next(it)
self.assertEqual(lh(it), 2)
next(it)
self.assertEqual(lh(it), 1)
next(it)
self.assertEqual(lh(it), 0)
self.assertRaises(StopIteration, next, it)
self.assertEqual(lh(it), 0)
Example #22
| Source File: test_iterlen.py From Fluid-Designer with GNU General Public License v3.0 | 5 votes |
|
def test_mutation(self):
d = list(range(n))
it = reversed(d)
next(it)
next(it)
self.assertEqual(length_hint(it), n - 2)
d.append(n)
self.assertEqual(length_hint(it), n - 2) # ignore append
d[1:] = []
self.assertEqual(length_hint(it), 0)
self.assertEqual(list(it), []) # confirm invariant
d.extend(range(20))
self.assertEqual(length_hint(it), 0)
## -- Check to make sure exceptions are not suppressed by __length_hint__()
Example #23
| Source File: test_iterlen.py From Fluid-Designer with GNU General Public License v3.0 | 5 votes |
|
def test_mutation(self):
d = list(range(n))
it = iter(d)
next(it)
next(it)
self.assertEqual(length_hint(it), n - 2)
d.append(n)
self.assertEqual(length_hint(it), n - 1) # grow with append
d[1:] = []
self.assertEqual(length_hint(it), 0)
self.assertEqual(list(it), [])
d.extend(range(20))
self.assertEqual(length_hint(it), 0)
Example #24
| Source File: test_iterlen.py From Fluid-Designer with GNU General Public License v3.0 | 5 votes |
|
def test_invariant(self):
it = self.it
for i in reversed(range(1, n+1)):
self.assertEqual(length_hint(it), i)
next(it)
self.assertEqual(length_hint(it), 0)
self.assertRaises(StopIteration, next, it)
self.assertEqual(length_hint(it), 0)
Example #25
| Source File: test_itertools.py From Fluid-Designer with GNU General Public License v3.0 | 5 votes |
|
def test_repeat_with_negative_times(self):
self.assertEqual(operator.length_hint(repeat(None, -1)), 0)
self.assertEqual(operator.length_hint(repeat(None, -2)), 0)
self.assertEqual(operator.length_hint(repeat(None, times=-1)), 0)
self.assertEqual(operator.length_hint(repeat(None, times=-2)), 0)
Example #26
| Source File: test_itertools.py From Fluid-Designer with GNU General Public License v3.0 | 5 votes |
|
def test_repeat(self):
self.assertEqual(operator.length_hint(repeat(None, 50)), 50)
self.assertEqual(operator.length_hint(repeat(None, 0)), 0)
self.assertEqual(operator.length_hint(repeat(None), 12), 12)
Example #27
| Source File: test_struct.py From Fluid-Designer with GNU General Public License v3.0 | 5 votes |
|
def test_length_hint(self):
lh = operator.length_hint
s = struct.Struct('>IB')
b = bytes(range(1, 16))
it = s.iter_unpack(b)
self.assertEqual(lh(it), 3)
next(it)
self.assertEqual(lh(it), 2)
next(it)
self.assertEqual(lh(it), 1)
next(it)
self.assertEqual(lh(it), 0)
self.assertRaises(StopIteration, next, it)
self.assertEqual(lh(it), 0)
