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Why do some functions have underscores “__” before and after the function name?
This "underscoring" seems to occur a lot, and I was wondering if this was a requirement in the Python language, or merely a matter of convention?
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ruby inheritance vs mixins
...It follows that entities or things are generally best
modeled in classes, and characteristics or properties of entities or things are
best encapsulated in modules. Correspondingly, as noted in section 4.1.1, class
names tend to be nouns, whereas module names are often adjectives (Stack
versus St...
Blocks and yields in Ruby
I am trying to understand blocks and yield and how they work in Ruby.
10 Answers
10
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How do I create a crontab through a script
...a text file with the job configured, then copy it to the cron spool folder and make sure it has the right permissions (600).
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Install .ipa to iPad with or without iTunes
I have the .ipa from PhoneGap build and I need to test it. I got provisioning profile from Developer account.
25 Answers
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MongoDB: How to query for records where field is null or not set?
...not set then:
db.emails.count({sent_at: {$exists: false}})
If its there and null, or not there at all:
db.emails.count({sent_at: null})
Refer here for querying and null
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Which is faster/best? SELECT * or SELECT column1, colum2, column3, etc
...eard that SELECT * is generally bad practice to use when writing SQL commands because it is more efficient to SELECT columns you specifically need.
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How to convert comma-separated String to List?
...al comma, zero or more whitespace which will place the words into the list and collapse any whitespace between the words and commas.
Please note that this returns simply a wrapper on an array: you CANNOT for example .remove() from the resulting List. For an actual ArrayList you must further use ...
Use URI builder in Android or create URL with variables
I'm developing an Android app. I need to build a URI for my app to make an API request. Unless there's another way to put a variable in a URI, this is the easiest way I've found. I found that you need to use Uri.Builder , but I'm not quite sure how to. My url is:
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Is a URL allowed to contain a space?
...he space
character is unsafe because significant spaces may disappear and
insignificant spaces may be introduced when URLs are transcribed or
typeset or subjected to the treatment of word-processing programs.
The characters "<" and ">" are unsafe because they are used as th...