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How can I filter lines on load in Pandas read_csv function?
How can I filter which lines of a CSV to be loaded into memory using pandas? This seems like an option that one should find in read_csv . Am I missing something?
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Why is it important to override GetHashCode when Equals method is overridden?
...s equal, it is not necessary for them to be the same; this is a collision, and Equals will be called to see if it is a real equality or not.
In this case, it looks like "return FooId;" is a suitable GetHashCode() implementation. If you are testing multiple properties, it is common to combine them ...
How do I view events fired on an element in Chrome DevTools?
...fired when I interact with it because I am trying to find out which event handler to use.
5 Answers
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PDO get the last ID inserted
I have a query, and I want to get the last ID inserted. The field ID is the primary key and auto incrementing.
3 Answers
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How can I escape double quotes in XML attributes values?
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Explicit and a longer naming convention is better than acronyms or shortened one when naming variables, function, attributes, or etc.; I'll take clarity over brevity anytime - is my unsolicited opinion.
– Daniel ...
java.lang.IllegalStateException: Cannot (forward | sendRedirect | create session) after response has
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A common misunderstanding among starters is that they think that the call of a forward(), sendRedirect(), or sendError() would magically exit and "jump" out of the method block, hereby ignoring the remnant of the code. For example:
protected vo...
Why doesn't C++ have a garbage collector?
...ood discussion of the topic here.
General overview:
C++ is very powerful and allows you to do almost anything. For this reason it doesn't automatically push many things onto you that might impact performance. Garbage collection can be easily implemented with smart pointers (objects that wrap po...
How to specialize std::hash::operator() for user-defined type in unordered containers?
To support user-defined key types in std::unordered_set<Key> and std::unordered_map<Key, Value>
one has to provide operator==(Key, Key) and a hash functor:
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gdb split view with code
I was just debugging a program in gdb and somehow I found a new feature I've never seen or even heard of before, a split view where I can see and browse the code in addition to giving commands:
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Proper way to implement IXmlSerializable?
...e a programmer decides to implement IXmlSerializable , what are the rules and best practices for implementing it? I've heard that GetSchema() should return null and ReadXml should move to the next element before returning. Is this true? And what about WriteXml - should it write a root eleme...