大约有 15,000 项符合查询结果（耗时：0.0315秒） [XML]
Using @property versus getters and setters
...ut hiding slow methods behind a @property decorator. The user of your API expects that property access performs like variable access, and straying too far away from that expectation can make your API unpleasant to use.
– defrex
Feb 25 '14 at 17:21
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Get list from pandas DataFrame column headers
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I would have expect something like df.column_names(). Is this answer still right or is it outdated?
– alvas
Jan 13 '16 at 6:48
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sql ORDER BY multiple values in specific order?
Ok I have a table with a indexed key and a non indexed field.
I need to find all records with a certain value and return the row.
I would like to know if I can order by multiple values.
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How to convert an array of strings to an array of floats in numpy?
...array of strings, there's a better way. Use astype().
import numpy as np
x = np.array(['1.1', '2.2', '3.3'])
y = x.astype(np.float)
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Matplotlib discrete colorbar
...As an alternative you can make your own cmap from scratch, or read-out an existing one and override just some specific entries.
import numpy as np
import matplotlib as mpl
import matplotlib.pylab as plt
fig, ax = plt.subplots(1, 1, figsize=(6, 6)) # setup the plot
x = np.random.rand(20) # defin...
Recommended way of making React component/div draggable
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I should probably turn this into a blog post, but here's pretty solid example.
The comments should explain things pretty well, but let me know if you have questions.
And here's the fiddle to play with: http://jsfiddle.net/Af9Jt/2/
var Draggable = React.createClass({
getDefaultProps: functio...
Proper Linq where clauses
...s to write them and each have the same results as far as I can tell. For example;
5 Answers
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Sort a list of tuples by 2nd item (integer value) [duplicate]
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sorted([('abc', 121),('abc', 231),('abc', 148), ('abc',221)], key=lambda x: x[1])
key should be a function that identifies how to retrieve the comparable element from your data structure. In your case, it is the second element of the tuple, so we access [1].
For optimization, see jamylak's res...
“Order by Col1, Col2” using entity framework
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Try OrderBy(x => x.Col1).ThenBy(x => x.Col2). It is a LINQ feature, anyway, not exclusive to EF.
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Maven Install on Mac OS X
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OS X prior to Mavericks (10.9) actually comes with Maven 3 built in.
If you're on OS X Lion, you won't have java installed by default. Just run java by itself and it'll prompt you to install it.
Assuming qualifications are ...