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The model backing the context has changed since the database was created
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Matt FrearMatt Frear
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How do I get a list of all the duplicate items using pandas in python?
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10 Answers
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JavaScript for detecting browser language preference [duplicate]
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answered Jul 26 '10 at 13:52
DanSingermanDanSingerman
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Mock vs MagicMock
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101
What is the reason for plain Mock existing?
Mock's author, Michael Foord, addressed a very si...
How to dynamically compose an OR query filter in Django?
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exsideexside
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Convert Django Model object to dict with all of the fields intact
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ZagsZags
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What are the differences between NP, NP-Complete and NP-Hard?
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nbro
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answered Oct 22 '13 at 6:08
Johnson WongJ...
What is a mixin, and why are they useful?
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10
@hillel good point, but keep in mind that Python will call superclasses' methods from left to right (when you need to override the construc...
Drop data frame columns by name
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You can use a simple list of names :
DF <- data.frame(
x=1:10,
y=10:1,
z=rep(5,10),
a=11:20
)
drops <- c("x","z")
DF[ , !(names(DF) %in% drops)]
Or, alternatively, you can make a list of those to keep and refer to them by name :
keeps <- c("y", "a")
DF[keeps]
EDIT :
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Stack smashing detected
...following snippet:
#include <stdio.h>
void func()
{
char array[10];
gets(array);
}
int main(int argc, char **argv)
{
func();
}
The compiler, (in this case gcc) adds protection variables (called canaries) which have known values. An input string of size greater than 10 causes c...