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ValueError : I/O operation on closed file
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edited May 19 at 16:30
Boris
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answered Sep ...
Hidden features of Scala
...al regex = "(\\d+)/(\\d+)/(\\d+)".r
val regex(year, month, day) = "2010/1/13"
The second line looks confusing if you're not used to using pattern matching and extractors. Whenever you define a val or var, what comes after the keyword is not simply an identifier but rather a pattern. That's why t...
How to switch position of two items in a Python list?
... Tiago Martins Peres 李大仁
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answered Mar 22 '10 at 16:31
samtregarsamtregar
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Is there a difference between single and double quotes in Java?
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Luiggi Mendoza
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answered Jan 13 '09 at 15:54
Yuval AdamYuval Adam
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How do I change column default value in PostgreSQL?
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Silver LightSilver Light
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Scala: join an iterable of strings
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432
How about mkString ?
theStrings.mkString(",")
A variant exists in which you can specify a pr...
Can't install via pip because of egg_info error
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143
Found out what was wrong. I never installed the setuptools for python, so it was missing some vi...
Parallel.ForEach vs Task.Run and Task.WhenAll
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163
In this case, the second method will asynchronously wait for the tasks to complete instead of bl...
How is the “greater than” or “>” character used in CSS?
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203
It's a CSS child selector. P > SPAN means applying the style that follows to all SPAN tags th...
How to detect UI thread on Android?
...) {
// On UI thread.
} else {
// Not on UI thread.
}
From API level 23 and up, there's a slightly more readable approach using new helper method isCurrentThread on the main looper:
if (Looper.getMainLooper().isCurrentThread()) {
// On UI thread.
} else {
// Not on UI thread.
}
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