大约有 3,516 项符合查询结果（耗时：0.0298秒） [XML]
What's the function like sum() but for multiplication? product()?
...iterable):
return reduce(operator.mul, iterable, 1)
>>> prod(range(1, 5))
24
Note, in Python 3, the reduce() function was moved to the functools module.
Specific case: Factorials
As a side note, the primary motivating use case for prod() is to compute factorials. We already have supp...
Python Process Pool non-daemonic?
...procs)
result = pool.map(sleepawhile,
[randint(1, 5) for x in range(num_procs)])
# The following is not really needed, since the (daemon) workers of the
# child's pool are killed when the child is terminated, but it's good
# practice to cleanup after ourselves anyway.
p...
Git diff between current branch and master but not including unmerged master commits
... in gitrevisions[7]. However, "diff" is about comparing two endpoints, not ranges, and the range notations ("<commit>..<commit>" and "<commit>...<commit>") do not mean a range as defined in the "SPECIFYING RANGES" section in gitrevisions[7].
...
Shared-memory objects in multiprocessing
...e = t
a = SharedNumpyMemManager.getArray(shm_hdl)
for j in range(INNER_LOOP):
a[i] = i
class Parallel_Dummy_PF:
def __init__(self, N):
self.N = N
self.arrayHdl = SharedNumpyMemManager.createArray(self.N, ctype=ctypes.c_double) ...
Python: Why is functools.partial necessary?
... return partial(math.sin, x)
Iter = 10**7
start = time.clock()
for i in range(0, Iter):
l = make_lambda()
stop = time.clock()
print('lambda creation time {}'.format(stop - start))
start = time.clock()
for i in range(0, Iter):
l()
stop = time.clock()
print('lambda execution time {}'.forma...
How do I interpret precision and scale of a number in a database?
...gt; could be truncated into 123.46 (p=5,s=2)
123450 (p=6,s=0) => out of range
Note that the range is generally defined by the precision: |value| < 10^p ...
share
|
improve this answer
...
SQL “between” not inclusive
...ETWEEN which does include BOTH the lower value and the upper values in the range, but does not magically make a date the "beginning of" or "the end of".
BETWEEN should be avoided when filtering by date ranges.
Always use the >= AND < instead
SELECT * FROM Cases
WHERE (created_at >= '2...
Regex (grep) for multi-line search needed [duplicate]
...ome simple solution. Thanks ! @Kev The comma is used as a separator in AWK range pattern. See full explanation in section 7.1.3 Specifying Record Ranges with Patterns of AWK user guide
– Olivier
Nov 21 '16 at 11:12
...
Convert a float64 to an int in Go
...func main() {
floats := []float64{1.9999, 2.0001, 2.0}
for _, f := range floats {
t := int(f)
s := fmt.Sprintf("%.0f", f)
if i, err := strconv.Atoi(s); err == nil {
fmt.Println(f, t, i)
} else {
fmt.Println(f, t, err)
}
}
}
...
iOS 7 TextKit - How to insert images inline with text?
...tringWithAttachment:textAttachment];
[attributedString replaceCharactersInRange:NSMakeRange(4, 1) withAttributedString:attrStringWithImage];
share
|
improve this answer
|
f...