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Delete the first three rows of a dataframe in pandas
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drop can even be calculated in-place (without extra assignment). Faster and simpler!
– tim
Jun 13 '14 at 18:24
1
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Why are preprocessor macros evil and what are the alternatives?
...can't be debugged.
When you have a macro that translates to a number or a string, the source code will have the macro name, and many debuggers, you can't "see" what the macro translates to. So you don't actually know what is going on.
Replacement: Use enum or const T
For "function-like" macros,...
pg_config executable not found
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I need the extra brew link postgresql
– vincentlcy
Mar 10 '16 at 8:56
1
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What are the differences between utf8_general_ci and utf8_unicode_ci? [duplicate]
...tf8_general_ci is fine only for Russian and Bulgarian subset of Cyrillic.
Extra letters used in Belarusian, Macedonian, Serbian, and Ukrainian
are sorted not well.
The cost of utf8_unicode_ci is that it is a little bit
slower than utf8_general_ci. But that’s the price you pay for correctness...
Visual Studio window which shows list of methods
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You will find "Options" in the menu under "Extras".
– ohgodnotanotherone
Sep 4 '17 at 8:43
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Difference between array_map, array_walk and array_filter
...onal array. Every element's value changes in place into a more informative string specifying its key, category and value.
<?php
$f = function(&$item,$key,$prefix) {
$item = "$key: $prefix: $item";
};
array_walk($nu, $f,"fruit");
var_dump($nu);
?>
See demo
Note: the callba...
How to manually trigger validation with jQuery validate?
...r unobtrusive validation only for this element if in place
// add your extra logic here to execute only when element is valid
}
Note that validate() needs to be called on the form before checking it using this method.
Documentation link:
https://jqueryvalidation.org/valid/
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Subtract two variables in Bash
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You just need a little extra whitespace around the minus sign, and backticks:
COUNT=`expr $FIRSTV - $SECONDV`
Be aware of the exit status:
The exit status is 0 if EXPRESSION is neither null nor 0, 1 if EXPRESSION is null or 0.
Keep this in min...
How do you launch the JavaScript debugger in Google Chrome?
...n a Mac, or just inspect an element). If you have Developer Tools open, an extra bit of awesomeness is that you can click and hold the Refresh button to clear the cache.
– toon81
Jul 8 '14 at 9:21
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How do I properly clean up Excel interop objects?
...Set = CharSet.Unicode)]
static extern IntPtr CreateJobObject(object a, string lpName);
[DllImport("kernel32.dll")]
static extern bool SetInformationJobObject(IntPtr hJob, JobObjectInfoType infoType, IntPtr lpJobObjectInfo, uint cbJobObjectInfoLength);
[DllImport("kernel32.dll", Set...