大约有 47,000 项符合查询结果（耗时：0.0551秒） [XML]
Why does direction of index matter in MongoDB?
...
3 Answers
3
Active
...
Move an item inside a list?
...
answered Jul 3 '10 at 23:15
David ZDavid Z
111k2323 gold badges218218 silver badges256256 bronze badges
...
Creating a new column based on if-elif-else condition
...df['C'] = df.apply(f, axis=1)
In [2]: df
Out[2]:
A B C
a 2 2 0
b 3 1 1
c 1 3 -1
Of course, this is not vectorized so performance may not be as good when scaled to a large number of records. Still, I think it is much more readable. Especially coming from a SAS background.
...
NameError: name 'reduce' is not defined in Python
I'm using Python 3.2. Tried this:
5 Answers
5
...
How to get a substring of text?
I have text with length ~700. How do I get only ~30 of its first characters?
5 Answers
...
Hex representation of a color with alpha channel?
Is there a W3 or any other noteworthy standard on how to represent a color (including alpha channel) in hex format?
5 Answe...
How to suppress specific MSBuild warning
Is there any way to disable specific MSBuild warning (e.g. MSB3253) when running MSBuild from command line? My build script calls msbuild.exe much the following way:
...
Get value of dynamically chosen class constant in PHP
...
Brad
140k3737 gold badges282282 silver badges452452 bronze badges
answered May 27 '11 at 2:20
Dan SimonDan Sim...