大约有 45,000 项符合查询结果（耗时：0.0461秒） [XML]
What is the PostgreSQL equivalent for ISNULL()
... |
edited Jan 14 '12 at 2:28
Erwin Brandstetter
439k9696 gold badges809809 silver badges969969 bronze badges
...
How does functools partial do what it does?
...
227
Roughly, partial does something like this (apart from keyword args support etc):
def partial(...
Types in MySQL: BigInt(20) vs Int(20)
...ious that they would allow for larger numbers; however, I can make an Int(20) or a BigInt(20) and that would make seem that it is not necessarily about size.
...
Mercurial stuck “waiting for lock”
...
492
When "waiting for lock on repository", delete the repository file: .hg/wlock (or it may be in .h...
Is it possible to allow didSet to be called during initialization in Swift?
...
|
edited Nov 20 '19 at 11:46
Nik Kov
9,00633 gold badges5252 silver badges8484 bronze badges
...
Overriding a Rails default_scope
...
152
Short answer: Do not use default_scope unless you really have to. You'll probably be better off...
String formatting named parameters?
...
In Python 2.6+ and Python 3, you might choose to use the newer string formatting method.
print('<a href="{0}">{0}</a>'.format(my_url))
which saves you from repeating the argument, or
print('<a href="{url}">{url}&l...
Try-finally block prevents StackOverflowError
...
332
It doesn't run forever. Each stack overflow causes the code to move to the finally block. The pr...
Drop columns whose name contains a specific string from pandas DataFrame
...
import pandas as pd
import numpy as np
array=np.random.random((2,4))
df=pd.DataFrame(array, columns=('Test1', 'toto', 'test2', 'riri'))
print df
Test1 toto test2 riri
0 0.923249 0.572528 0.845464 0.144891
1 0.020438 0.332540 0.144455 0.741412
cols = [c for...