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In Python script, how do I set PYTHONPATH?
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You can get and set environment variables via os.environ:
import os
user_home = os.environ["HOME"]
os.environ["PYTHONPATH"] = "..."
But since your interpreter is already running, this will have no effect. You're better off using
import sys
sys.path.append("...")
which is the array that your...
When should you not use virtual destructors?
...ism, even if its destructor were virtual:
class MutexLock {
mutex *mtx_;
public:
explicit MutexLock(mutex *mtx) : mtx_(mtx) { mtx_->lock(); }
~MutexLock() { mtx_->unlock(); }
private:
MutexLock(const MutexLock &rhs);
MutexLock &operator=(const MutexLock &rhs);
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How to verify that method was NOT called in Moq?
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Run a verify after the test which has a Times.Never enum set. e.g.
_mock.Object.DoSomething()
_mock.Verify(service => service.ShouldntBeCalled(), Times.Never);
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Debugging Scala code with simple-build-tool (sbt) and IntelliJ
... running the remote JVM -- something like
-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=5005
Launch sbt with these arguments and then execute jetty-run. Finally, launch your remote debug configuration in IntelliJ. This thread might be useful.
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Numeric for loop in Django templates
...onal context. Sometimes this comes in handy
{% for i in '0123456789'|make_list %}
{{ forloop.counter }}
{% endfor %}
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Block Comments in Clojure
... A word of warning -- the (comment) macro expands to nil. Use #_ to comment a single form, or #_(comment ...) to comment multiple forms without inserting a nil.
– treat your mods well
Dec 18 '11 at 2:55
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What differences, if any, between C++03 and C++11 can be detected at run-time?
...led with a C++ compiler, will return 1 (the trivial sulution with
#ifdef __cplusplus is not interesting).
8 Answers
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How to implement Enums in Ruby?
...to enhance readability without littering code with literal strings.
postal_code[:minnesota] = "MN"
postal_code[:new_york] = "NY"
Constants are appropriate when you have an underlying value that is important. Just declare a module to hold your constants and then declare the constants within that.
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What is the relative performance difference of if/else versus switch statement in Java?
...view a switch statement as follows:
switch (<condition>) {
case c_0: ...
case c_1: ...
...
case c_n: ...
default: ...
}
where c_0, c_1, ..., and c_N are integral numbers that are targets of the switch statement, and <condition> must resolve to an integer expression.
I...
printf with std::string?
... for some reason, you need to extract the C-style string, you can use the c_str() method of std::string to get a const char * that is null-terminated. Using your example:
#include <iostream>
#include <string>
#include <stdio.h>
int main()
{
using namespace std;
string my...