I have a data frame. Let's call him bob : 18 Answers 18 ...

... You could use get_defined_vars() to find the name of a variable that has the same value as the one you're trying to find the name of. Obviously this will not always work, since different variables often have the same values, but it's the only way I can think of to do this. Edit: get_...

... Adopted from here. Most templates in the C++ standard library require that they be instantiated with complete types. However shared_ptr and unique_ptr are partial exceptions. Some, but not all of their members can be instantiated with incomplete types. The motivation for this is t...

In Ruby, how do you call a class method from one of that class's instances? Say I have 9 Answers ...

I know this is a rather simple question, but I can't figure it out for the life of me. I have two links which I've applied a background image to. Here's what it currently looks like (apologies for the shadow, just a rough sketch of a button): ...

...in a python string? For example, I want a string like strip my spaces to be turned into stripmyspaces , but I cannot seem to accomplish that with strip() : ...

...'m running into an issue when trying to pass error messages around using web sockets. I can replicate the issue I am facing using JSON.stringify to cater to a wider audience: ...

一个故事告诉你比特币的原理及运作机制bitcoin-mechanism-make-easy周末花时间看了一些比特币原理相关的资料，虽然不敢说把每个细节都完全搞懂了，不过整体思路和关键部分的主要原理还是比较明白。写一篇文章...周末花时间看了...

... dot is matrix multiplication, but * does something else. We have two arrays: X, shape (97,2) y, shape (2,1) With Numpy arrays, the operation X * y is done element-wise, but one or both of the values can be expanded in one or more dimensions to mak...

Why is it possible to write constructor for an abstract class in C#? As far as I know we can't instantiate an abstract class.. so what is it for? You can't instantiate the class, right? ...