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Transpose a data frame
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Thanks for contributing an answer to Stack Overflow!Please be sure to answer the question. Provide details and share your research!But avoid …Asking for help, clarification, or responding to other answers.Making statements based o...
Keep only first n characters in a string?
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You are looking for JavaScript's String method substring
e.g.
'Hiya how are you'.substring(0,8);
Which returns the string starting at the first character and finishing before the 9th character - i.e. 'Hiya how'.
substring documentation
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Can you provide some examples of why it is hard to parse XML and HTML with a regex? [closed]
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Here's some fun valid XML for you:
<!DOCTYPE x [ <!ENTITY y "a]>b"> ]>
<x>
<a b="&y;>" />
<![CDATA[[a>b <a>b <a]]>
<?x <a> <!-- <b> ?> c --> d
</x>
And th...
Should I avoid 'async void' event handlers?
I know it is considered generally a bad idea to use fire-and-forget async void methods to start tasks, because there is no track of the pending task and it is tricky to handle exceptions which might be thrown inside such a method.
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Formatting “yesterday's” date in python
I need to find "yesterday's" date in this format MMDDYY in Python.
6 Answers
6
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How to get a reference to a module inside the module itself?
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except for this won't be quite correct if module is reloaded; I don't think there's any place where a reference is guaranteed to be kept, if there was, reloading wouldn't really work, right?
– Dima Tisnek
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How do I set the maximum line length in PyCharm?
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Indeed, and in retrospect for the project where we followed PEP 8, we were way too strict. Following the 79 line limitation, the code quickly becomes unreadable and unmaintainable. Let's quote PEP-8: A style guide is about consistency. Consistency wit...
Rails nested form with has_many :through, how to edit attributes of join model?
...u edit the attributes of a join model when using accepts_nested_attributes_for?
3 Answers
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How to get the list of all printers in computer
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Try this:
foreach (string printer in System.Drawing.Printing.PrinterSettings.InstalledPrinters)
{
MessageBox.Show(printer);
}
share
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Is PHP's count() function O(1) or O(n) for arrays?
... calls php_count_recursive(), which in turn calls zend_hash_num_elements() for non-recursive array, which is implemented this way:
ZEND_API int zend_hash_num_elements(const HashTable *ht)
{
IS_CONSISTENT(ht);
return ht->nNumOfElements;
}
So you can see, it's O(1) for $mode = COUNT_NOR...