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What's the difference between eval, exec, and compile?
I've been looking at dynamic evaluation of Python code, and come across the eval() and compile() functions, and the exec statement.
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Join a list of items with different types as string in Python
... For example, if you have a list of integers then you can convert them one by one in a for-loop and join them with ,:
print(','.join(str(x) for x in list_of_ints))
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Which selector do I need to select an option by its text?
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This could help:
$('#test').find('option[text="B"]').val();
Demo fiddle
This would give you the option with text B and not the ones which has text that contains B. Hope this helps
For recent versions of jQuery the above does not work. As commented by Quandary below, t...
How to delete a row by reference in data.table?
My question is related to assignment by reference versus copying in data.table . I want to know if one can delete rows by reference, similar to
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Is C++ context-free or context-sensitive?
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Below is my (current) favorite demonstration of why parsing C++ is (probably) Turing-complete, since it shows a program which is syntactically correct if and only if a given integer is prime.
So I assert that C++ is neither ...
What are good uses for Python3's “Function Annotations”
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I think this is actually great.
Coming from an academic background, I can tell you that annotations have proved themselves invaluable for enabling smart static analyzers for languages like Java. For instance, you could define semantics like state restrictions, threads that are all...
How does tuple comparison work in Python?
I have been reading the Core Python programming book, and the author shows an example like:
4 Answers
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How do you add a Dictionary of items into another Dictionary
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Dima
22.7k55 gold badges4949 silver badges8181 bronze badges
answered Jun 5 '14 at 5:14
shucaoshucao
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How to resume Fragment from BackStack if exists
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Reading the documentation, there is a way to pop the back stack based on either the transaction name or the id provided by commit. Using the name may be easier since it shouldn't require keeping track of a number that may change and reinforces the "unique back stack entry" logi...
Rotated elements in CSS that affect their parent's height correctly
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Assuming that you want to rotate 90 degrees, this is possible, even for non-text elements - but like many interesting things in CSS, it requires a little cunning. My solution also technically invokes undefined behaviour according to the CSS 2 spec - so while I've tested and confirme...