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Create Django model or update if exists
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answered Jan 1 '13 at 23:46
bakkalbakkal
47.8k1010 gold badges102102 silver badges9494 bronze badges
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How to modify Github pull request？
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182
Just push more commits on to the branch the request is for. The pull request will pick this up t...
Repeat each row of data.frame the number of times specified in a column
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Here's one solution:
df.expanded <- df[rep(row.names(df), df$freq), 1:2]
Result:
var1 var2
1 a d
2 b e
2.1 b e
3 c f
3.1 c f
3.2 c f
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im...
Can I call an overloaded constructor from another constructor of the same class in C#?
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229
No, You can't do that, the only place you can call the constructor from another constructor in...
How do I initialize the base (super) class?
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pass
class Y(X):
def __init__(self):
super(Y, self).__init__(123)
def doit(self, foo):
return super(Y, self).doit(foo)
Because python knows about old- and new-style classes, there are different ways to invoke a base method, which is why you've found multiple ways of doing so.
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NPM/Bower/Composer - differences?
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192
npm is nodejs package manager. It therefore targets nodejs environments, which usually means ser...
Difference between a Postback and a Callback
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204
A Postback occurs when the data (the whole page) on the page is posted from the client to the ...
getenv() vs. $_ENV in PHP
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answered Jan 10 '12 at 3:49
BatkinsBatkins
5,1302525 silver badges2626 bronze badges
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How do I join two SQLite tables in my Android application?
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205
You need rawQuery method.
Example:
private final String MY_QUERY = "SELECT * FROM table_a a ...
RSA Public Key format
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You can't just change the delimiters from ---- BEGIN SSH2 PUBLIC KEY ---- to -----BEGIN RSA PUBLIC KEY----- and expect that it will be sufficient to convert from one format to another (which is what you've done in your example).
This article has a good explanation about both form...