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What is the most efficient string concatenation method in python?
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Also, .format() has three forms, in order from fast to slow: "{}".format(x), "{0}".format(x), "{x}".format(x=x)
– TemporalWolf
May 1 '17 at 22:45
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How to execute a raw update sql with dynamic binding in rails
...getting composite_primary_keys to function with activerecord 2.3.8. So in order to access the sqlserver 2000 table with a composite primary key, raw sql was required.
sql = "update [db].[dbo].[#{Contacts.table_name}] " +
"set [COLUMN] = 0 " +
"where [CLIENT_ID] = '#{contact.CLIENT_ID}'...
Replacement for “rename” in dplyr
...onious solution but this works and preserves all columns (though not their order). disp does not get duplicated.
– farnsy
Aug 22 '14 at 3:38
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Weak and strong property setter attributes in Objective-C
...ver may be unpredictably set to nil". I have seen some other posts that in order to prevent this warning, you have to create a local strong reference. And if this is true, what's the point to make a property weak, if at the end I have to create a strong reference?
– arh
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how to draw smooth curve through N points using javascript HTML5 canvas?
... 2, 4, 4);
}
}
To draw a curve have an array with x, y points in the order: x1,y1, x2,y2, ...xn,yn.
Use it like this:
var myPoints = [10,10, 40,30, 100,10]; //minimum two points
var tension = 1;
drawCurve(ctx, myPoints); //default tension=0.5
drawCurve(ctx, myPoints, tension);
The functio...
How to display all methods of an object?
..."random", "round", "floor", "acos", "atan", "min", "sin"] in no particular order.
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How do I check if there are duplicates in a flat list?
...s I had tried your_list != list(set(your_list)) which will not work as the order of the elements will change. Using len is a good way to solve this problem
– igniteflow
May 31 '12 at 14:37
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Convert hex string to int in Python
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>>> print int("10", 0)
10
(You must specify 0 as the base in order to invoke this prefix-guessing behavior; omitting the second parameter means to assume base-10.)
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Python extending with - using super() Python 3 vs Python 2
...does is: it calls the method from the next class in MRO (method resolution order). The MRO for C is: (C, A, B, object). You can print C.__mro__ to see it.
So, C inherits __init__ from A and super in A.__init__ calls B.__init__ (B follows A in MRO).
So by doing nothing in C, you end up calling both...
Deserialize JSON with C#
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An explanation would be in order.
– Peter Mortensen
Nov 25 '19 at 11:20
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