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How can I convert an RGB image into grayscale in Python?
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knowing that my aim is to use GLCM features (greycoprops)
– Sam
Dec 1 '15 at 20:56
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Subprocess changing directory
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To run your_command as a subprocess in a different directory, pass cwd parameter, as suggested in @wim's answer:
import subprocess
subprocess.check_call(['your_command', 'arg 1', 'arg 2'], cwd=working_dir)
A child process can't change its parent's working directo...
Writing your own STL Container
...edef typename A::const_reference const_reference;
typedef typename A::difference_type difference_type;
typedef typename A::size_type size_type;
class iterator {
public:
typedef typename A::difference_type difference_type;
typedef typename A::value_type value_type;
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Add alternating row color to SQL Server Reporting services report
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@FistOfFury The only solution I know is to ensure a value is set (usually 0) for missing data.
– Kyle Hale
Dec 2 '13 at 19:27
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Keyboard Interrupts with python's multiprocessing Pool
...lmost certainly interrupt a condition wait.
Note that this doesn't happen if a timeout is specified; cond.wait(1) will receive the interrupt immediately. So, a workaround is to specify a timeout. To do that, replace
results = pool.map(slowly_square, range(40))
with
results = pool.map_...
Coding Practices which enable the compiler/optimizer to make a faster program
...his can be a huge help for getting around aliasing slowdowns. For example, if your code looks like
void DoSomething(const Foo& foo1, const Foo* foo2, int numFoo, Foo& barOut)
{
for (int i=0; i<numFoo, i++)
{
barOut.munge(foo1, foo2[i]);
}
}
the compiler doesn't kno...
Is there Selected Tab Changed Event in the standard WPF Tab Control
...Control_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (e.Source is TabControl)
{
//do work when tab is changed
}
}
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How to assert two list contain the same elements in Python? [duplicate]
...simple example which compares two lists having the same elements but in a different order.
using assertCountEqual the test will succeed
using assertListEqual the test will fail due to the order difference of the two lists
Here a little example script.
import unittest
class TestListElements(un...
Best way to do multi-row insert in Oracle?
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Being picky, but the formatting makes more sense if you put "union all" at the end of each select line (except for the last).
– Jamie
Apr 25 '17 at 20:34
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Is there a Python equivalent of the C# null-coalescing operator?
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other = s or "some default value"
Ok, it must be clarified how the or operator works. It is a boolean operator, so it works in a boolean context. If the values are not boolean, they are converted to boolean for the purposes of the operator.
Note that the or operator does not r...