大约有 47,000 项符合查询结果（耗时：0.0406秒） [XML]
Accessing class variables from a list comprehension in the class definition
...owing will fail:
class A:
a = 42
b = list(a + i for i in range(10))
So, to summarize: you cannot access the class scope from functions, list comprehensions or generator expressions enclosed in that scope; they act as if that scope does not exist. In Python 2, list comprehensions were i...
Creating a zero-filled pandas data frame
...
140
You can try this:
d = pd.DataFrame(0, index=np.arange(len(data)), columns=feature_list)
...
How can I set the aspect ratio in matplotlib?
... Zhenya's answer suggests it's fixed in the latest version. I have version 0.99.1.1 and I've created the following solution:
import matplotlib.pyplot as plt
import numpy as np
def forceAspect(ax,aspect=1):
im = ax.get_images()
extent = im[0].get_extent()
ax.set_aspect(abs((extent[1]-...
Sort array of objects by single key with date value
... use Array.sort.
Here's an example:
var arr = [{
"updated_at": "2012-01-01T06:25:24Z",
"foo": "bar"
},
{
"updated_at": "2012-01-09T11:25:13Z",
"foo": "bar"
},
{
"updated_at": "2012-01-05T04:13:24Z",
"foo": "bar"
}
]
arr.sort(function(a, b) {
v...
What causes a java.lang.ArrayIndexOutOfBoundsException and how do I prevent it?
...
300
Your first port of call should be the documentation which explains it reasonably clearly:
T...
Remote JMX connection
... Rob Kielty
7,14577 gold badges3434 silver badges5050 bronze badges
answered May 7 '09 at 13:31
takete.dktakete.dk
2,56511 gold ...
What's the difference between --general-numeric-sort and --numeric-sort options in gnu sort
... compares the numbers as floats, this allows scientific notation eg 1.234E10 but is slower and subject to rounding error (1.2345678 could come after 1.2345679), numeric sort is just a regular alphabetic sort that knows 10 comes after 9.
See http://www.gnu.org/software/coreutils/manual/html_nod...
Why is early return slower than else?
...
+100
This is a pure guess, and I haven't figured out an easy way to check whether it is right, but I have a theory for you.
I tried your ...
How do Python's any and all functions work?
...or example,
>>> multiples_of_6 = (not (i % 6) for i in range(1, 10))
>>> any(multiples_of_6)
True
>>> list(multiples_of_6)
[False, False, False]
Here, (not (i % 6) for i in range(1, 10)) is a generator expression which returns True if the current number within 1 and 9 i...
Breaking out of a nested loop
...
209
Well, goto, but that is ugly, and not always possible. You can also place the loops into a meth...