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Wrapping a C library in Python: C, Cython or ctypes?
...o C for you. Or, you can start rewriting parts of your C code in Cython in order to avoid calls and to specialise and tighten your loops algorithmically. And if you need a fast callback, just write a function with the appropriate signature and pass it into the C callback registry directly. Again, no...
When should you not use virtual destructors?
...number of some object, it would be worth avoiding all virtual functions in order to save the additional 32 bits per object.
In all other cases, you will save yourself debug misery to make the dtor virtual.
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window.location.href and window.open () methods in JavaScript
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Confirm deletion in modal / dialog using Twitter Bootstrap?
...we want to have delete confirmation for:
<a href="#" data-href="delete.php?id=23" data-toggle="modal" data-target="#confirm-delete">Delete record #23</a>
<button class="btn btn-default" data-href="/delete.php?id=54" data-toggle="modal" data-target="#confirm-delete">
Delete re...
How to implement a rule engine?
...ool IsEnabled { get; set; }
/// <summary>
/// Represents the order in which a rule should be executed relative to other rules
/// </summary>
int SortOrder { get; set; }
}
The "Expression" is compiled as the body of the "Test" method when the application first executes....
Add Variables to Tuple
...confusion between an element in parentheses. Plain parentheses are used in order of operations, so (7) is just 7. But (7,) is a one-element tuple where the element is 7. Likewise, 3 * ( 7+8) = 45, but 3 * (7+8,) = (15, 15, 15) -- does that make sense?
– Daniel
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What is external linkage and internal linkage?
...e to control when it is constructed due to issues with global construction order and can't dynamically allocate it using new while more in-depth initialization schemes may be beyond what is necessary for the object in question; by implication, this is mainly an issue on embedded systems that use C++...
How SID is different from Service name in Oracle tnsnames.ora
...ich this instance connects. You can
specify multiple services names in
order to distinguish among different
uses of the same database. For
example:
SERVICE_NAMES = sales.acme.com,
widgetsales.acme.com
You can also use service names to
identify a single service that is
availab...
Format number to 2 decimal places
...://www.w3resource.com/mysql/mathematical-functions/mysql-truncate-function.php
With rounding:
ROUND(0.166, 2)
-- will be evaluated to 0.17
ROUND(0.164, 2)
-- will be evaluated to 0.16
docs: http://www.w3resource.com/mysql/mathematical-functions/mysql-round-function.php
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Split (explode) pandas dataframe string entry to separate rows
...se)
.fillna(fill_value))
# revert the original index order
res = res.sort_index()
# reset index if requested
if not preserve_index:
res = res.reset_index(drop=True)
return res
Demo:
Multiple list columns - all list columns must have the same #...