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Ruby Array find_first object?
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use array detect method if you wanted to return first value where block returns true
[1,2,3,11,34].detect(&:even?) #=> 2
OR
[1,2,3,11,34].detect{|i| i.even?} #=> 2
If you wanted to return all values where block returns true then use s...
How to run a command before a Bash script exits?
If a Bash script has set -e , and a command in the script returns an error, how can I do some cleanup before the script exits?
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AppInventor2中的二进制数据以什么样的形式传递？字节列表、字节数组是什么...
...p; resetErrorInfo(funcName);
if (!IsConnected()) {
raiseErrorOccured(funcName, new MqttException(Helper.REASON_CODE_INVALID_STATE));
return;
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Let JSON object accept bytes or let urlopen output strings
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HTTP sends bytes. If the resource in question is text, the character encoding is normally specified, either by the Content-Type HTTP header or by another mechanism (an RFC, HTML meta http-equiv,...).
urllib should know how to encode the bytes...
Drop rows with all zeros in pandas data frame
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Some mention should be made of difference between using .all and .any since the original question mentioned equivalence of dropna. If you want to drop all rows with any column containing a zero, you have to reverse the .all and .any in above answer. Took me...
Python dict how to create key or append an element to key?
...default(...)
D.setdefault(k[,d]) -> D.get(k,d), also set D[k]=d if k not in D
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Method Overloading for null argument
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Java will always try to use the most specific applicable version of a method that's available (see JLS §15.12.2).
Object, char[] and Integer can all take null as a valid value. Therefore all 3 version are applicable, so Java will have to find the most specific one...
How do I delete everything in Redis?
... error (error) LOADING Redis is loading the dataset in memory. Can you specify why?
– Ram Patra
Oct 27 '14 at 6:57
4
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Why is there no tuple comprehension in Python?
...n is just syntactic sugar to use a generator expression that outputs a specific type. list(i for i in (1, 2, 3)) is a generator expression that outputs a list, set(i for i in (1, 2, 3)) outputs a set. Does that mean the comprehension syntax is not needed? Perhaps not, but it is awfully handy. For th...
Pretty printing XML with javascript
...that a string result is expected, as opposed to an HTML-formatted result.
If this is so, the simplest way to achieve this is to process the XML document with the identity transformation and with an <xsl:output indent="yes"/> instruction:
<xsl:stylesheet version="1.0"
xmlns:xsl="http://w...