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When is “i += x” different from “i = i + x” in Python?
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323
This depends entirely on the object i.
+= calls the __iadd__ method (if it exists -- falling...
How to convert hex to rgb using Java?
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* @param colorStr e.g. "#FFFFFF"
* @return
*/
public static Color hex2Rgb(String colorStr) {
return new Color(
Integer.valueOf( colorStr.substring( 1, 3 ), 16 ),
Integer.valueOf( colorStr.substring( 3, 5 ), 16 ),
Integer.valueOf( colorStr.substring( 5, 7...
How to make the 'cut' command treat same sequental delimiters as one?
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552
Try:
tr -s ' ' <text.txt | cut -d ' ' -f4
From the tr man page:
-s, --squeeze-repeats ...
How do you run your own code alongside Tkinter's event loop?
...inter import *
root = Tk()
def task():
print("hello")
root.after(2000, task) # reschedule event in 2 seconds
root.after(2000, task)
root.mainloop()
Here's the declaration and documentation for the after method:
def after(self, ms, func=None, *args):
"""Call function once after giv...
Return multiple values in JavaScript?
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20 Answers
20
Active
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Transparent ARGB hex value
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205
Transparency is controlled by the alpha channel (AA in #AARRGGBB). Maximal value (255 dec, FF ...
Interview question: Check if one string is a rotation of other string [closed]
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26 Answers
26
Active
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Modulo operator with negative values [duplicate]
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200
From ISO14882:2011(e) 5.6-4:
The binary / operator yields the quotient, and the binary % o...
Error: Jump to case label
...In the following code, if foo equals 1, everything is ok, but if it equals 2, we'll accidentally use the i variable which does exist but probably contains garbage.
switch(foo) {
case 1:
int i = 42; // i exists all the way to the end of the switch
dostuff(i);
break;
case 2:
dostu...
What does .SD stand for in data.table in R
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206
.SD stands for something like "Subset of Data.table". There's no significance to the initial "...