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Pythonic way of checking if a condition holds for any element of a list
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any():
if any(t < 0 for t in x):
# do something
Also, if you're going to use "True in ...", make it a generator expression so it doesn't take O(n) memory:
if True in (t < 0 for t in x):
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Django REST framework: non-model serializer
...operations). Instead, it provides other services with some calculation results. On a request my service makes some calculations and just returns the results back (doesn't store the results in its own database).
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What is wrong with using goto? [duplicate]
...de to simply return early when possible.
– Charlie Salts
Aug 19 '10 at 0:14
89
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You can't specify target table for update in FROM clause
...d in that innermost query, and adding a good WHERE clause to limit the results, too.
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Difference between app.all('*') and app.use('/')
... it to next handler in queue.
app.use([path], function)
app.all takes multiple callbacks, and meant for routing. with multiple callbacks you can filter requests and send responses. Its explained in Filters on express.js
app.all(path, [callback...], callback)
app.use only sees whether url start...
Can I assume (bool)true == (int)1 for any C++ compiler?
...ate false or non-zero to indicate true. For example, the is* functions in <ctype.h> only require zero or non-zero, not necessarily zero or one.
If you cast that to bool, zero will convert to false, and non-zero to true (as you'd expect).
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How to jump to a particular line in a huge text file?
Are there any alternatives to the code below:
16 Answers
16
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What are the GCC default include directories?
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In order to figure out the default paths used by gcc/g++, as well as their priorities, you need to examine the output of the following commands:
For C:
gcc -xc -E -v -
For C++:
gcc -xc++ -E -v -
The credit goes to Qt Creator team.
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How to Test a Concern in Rails
...is doesn't work. It gives me the error: undefined method 'full_name' for #<struct first_name="Stewart", last_name="Home">
– Kyle Decot
May 13 '13 at 18:29
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How many String objects will be created when using a plus sign?
...:
void Foo() {
String one = "1";
String two = "2";
String result = one + two + "34";
Console.Out.WriteLine(result);
}
then the compiler seems to emit the code using String.Concat as @Joachim answered (+1 to him btw).
If you define them as constants, e.g.:
const String one = "1";...