大约有 19,000 项符合查询结果（耗时：0.0366秒） [XML]
How to set a value of a variable inside a template code?
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If you need to declare a list, use make_list. docs.djangoproject.com/en/1.9/ref/templates/builtins/#make-list
– MrValdez
Jul 1 '16 at 7:55
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What is the difference between ndarray and array in numpy?
... I think array() is implemented in core/src/multiarray/methods.c in array_getarray().
– flxb
Apr 8 '13 at 13:14
6
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Python: try statement in a single line
... I wanted to write up a sequence of actions for debugging:
exec "try: some_problematic_thing()\nexcept: problem=sys.exc_info()"
print "The problem is %s" % problem[1]
For the most part, I'm not at all bothered by the no-single-line-try-except restriction, but when I'm just experimenting and I wan...
Dealing with float precision in Javascript [duplicate]
...000000004
> (x * cf) * (y * cf) / (cf * cf)
0.02
Quick solution:
var _cf = (function() {
function _shift(x) {
var parts = x.toString().split('.');
return (parts.length < 2) ? 1 : Math.pow(10, parts[1].length);
}
return function() {
return Array.prototype.reduce.call(argum...
I need to generate uuid for my rails application. What are the options(gems) I have? [duplicate]
...to be in Ruby 1.8.7. Looks like it was added in 1.9.3: apidock.com/ruby/v1_9_3_392/SecureRandom/uuid/class
– existentialmutt
Aug 25 '14 at 17:31
2
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What is the difference between “px”, “dip”, “dp” and “sp”?
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@android_developer (5 comments above) dp does not have the exact same physical length. (Although it is close.) See @Fraggle's comment about bucketing. What this means is that 48dp will be roughly 8mm (0.3 inch), but it may vary up to...
C++ map access discards qualifiers (const)
...k up a key without modifying the map.
find() returns an iterator, or const_iterator to an std::pair containing both the key (.first) and the value (.second).
In C++11, you could also use at() for std::map. If element doesn't exist the function throws a std::out_of_range exception, in contrast to o...
SQLAlchemy: cascade delete
... This is well explained in the current doc docs.sqlalchemy.org/en/rel_0_9/orm/cascades.html
– Epoc
Feb 28 '15 at 19:47
1
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What are the most common naming conventions in C?
...which can be summarized as follows:
All macros and constants in caps: MAX_BUFFER_SIZE, TRACKING_ID_PREFIX.
Struct names and typedef's in camelcase: GtkWidget, TrackingOrder.
Functions that operate on structs: classic C style: gtk_widget_show(), tracking_order_process().
Pointers: nothing fancy her...
How to smooth a curve in the right way?
... how easy it is to use. Note: I left out the code for defining the savitzky_golay() function because you can literally copy/paste it from the cookbook example I linked above.
import numpy as np
import matplotlib.pyplot as plt
x = np.linspace(0,2*np.pi,100)
y = np.sin(x) + np.random.random(100) * 0...