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Scala actors: receive vs react
...re the stack state makes the thread faster to start.
There are various performance reasons why you might want one or other. As you know, having too many threads in Java is not a good idea. On the other hand, because you have to attach an actor to a thread before it can react, it is faster to receiv...
__FILE__, __LINE__, and __FUNCTION__ usage in C++
...y particular reason not to use __FILE__ , __LINE__ and __FUNCTION__ for logging and debugging purposes?
6 Answers
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What is the difference between Pan and Swipe in iOS?
...nts. The difference is in the recognizer semantics: a pan recognizer looks for the beginning of translational movement and continues to report movement in any direction over time, while a swipe recognizer makes an instantaneous decision as to whether the user's touches moved linearly in the required...
How would I get a cron job to run every 30 minutes?
...age, the / syntax is supported. Thus, to figure out why it wasn't working for you, you'll need to look at the logs for cron. In those logs, you should find a clear failure message.
Note: Mac OS X appears to use Vixie Cron, the same as Linux and the BSDs.
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Why `null >= 0 && null
...hat really happens is that the Greater-than-or-equal Operator (>=), performs type coercion (ToPrimitive), with a hint type of Number, actually all the relational operators have this behavior.
null is treated in a special way by the Equals Operator (==). In a brief, it only coerces to undefined:...
Pandas: create two new columns in a dataframe with values calculated from a pre-existing column
... Thanks, great, it works. I found nothing like this in the docs for 0.8.1... I suppose I should always think on Series as lists of tuples...
– joaquin
Sep 10 '12 at 17:28
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Python constructors and __init__
...r general question about constructors, Wikipedia is a good starting point. For Python-specific stuff, I highly recommend the Python docs.
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How can I find the first occurrence of a sub-string in a python string?
...lt function .
This can be implemented as
def find_pos(string,word):
for i in range(len(string) - len(word)+1):
if string[i:i+len(word)] == word:
return i
return 'Not Found'
string = "the dude is a cool dude"
word = 'dude1'
print(find_pos(string,word))
# output 4
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Bare asterisk in function arguments?
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Bare * is used to force the caller to use named arguments - so you cannot define a function with * as an argument when you have no following keyword arguments.
See this answer or Python 3 documentation for more details.
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App Inventor 2 低功耗蓝牙(BLE) 硬件接入、数据通信及IO控制 - App Invent...
...示values数据是否是有符号的数值（假表示无符号）serviceUuid - 服务UUID，通俗来讲它就是硬件的唯一身份IDcharacteristicUuid - 特性UUID，通俗来讲它是硬件中某一功能的唯一身份ID
一个硬件UUID示例如下：UUID分为标准UUID和厂商自定义...