大约有 30,200 项符合查询结果（耗时：0.0613秒） [XML]
Transpose list of lists
...
answered Jun 24 '11 at 20:59
jenajena
5,97911 gold badge1919 silver badges2222 bronze badges
...
T-SQL stored procedure that accepts multiple Id values
...
PortmanPortman
30.5k2424 gold badges7878 silver badges9999 bronze badges
add a co...
Pandas: create two new columns in a dataframe with values calculated from a pre-existing column
...)
%timeit df["A1"], df["A2"] = zip(*df["a"].apply(calculate))
159 ms ± 5.24 ms per loop (mean ± std. dev. of 7 runs, 10 loops each)
60x faster than zip
In general, avoid using apply
Apply is generally not much faster than iterating over a Python list. Let's test the performance of a for-loo...
Return first match of Ruby regex
... LitmusLitmus
8,56055 gold badges2525 silver badges4242 bronze badges
add a comment
|
...
Rails.env vs RAILS_ENV
...
jgpawletkojgpawletko
49244 silver badges1313 bronze badges
add a comment
...
Get current stack trace in Ruby without raising an exception
...
Serjik
8,24366 gold badges5353 silver badges6262 bronze badges
answered Nov 7 '16 at 12:54
Rajat BansalRajat B...
Adding a y-axis label to secondary y-axis in matplotlib
...
241
The best way is to interact with the axes object directly
import numpy as np
import matplotli...
Is there a Python equivalent of the C# null-coalescing operator?
...
Cory Klein
36.8k2424 gold badges158158 silver badges216216 bronze badges
answered Feb 12 '11 at 15:06
JulianoJuliano
...
Regex lookahead for 'not followed by' in grep
...|
edited Dec 19 '17 at 17:24
answered Jan 6 '16 at 3:50
dou...
How do I ignore the initial load when watching model changes in AngularJS?
...this flag hack
– Charlie Martin
Feb 24 '15 at 19:27
2
MW's answer is actually incorrect as the ne...