I have an iterable that returns multiple values as a list. In this case, I only care about one of the values in each iteration. As a concrete example: This produces: But I really just want: I could just do: or: or: but it feels like it would be nicer to tell Python that I’m uninterested in all the other
Tag: iterable-unpacking
Python Pandas Loop through Dictionary Keys (which are tuples) and plot variables against each other
I have a correlation matrix (in the form of a DataFrame) from which I return a Series which is the top n correlated pairs of columns and the value of the correlation: See this for an example of what I mean. I take the resulting Series object and then cast as a dictionary like so: The resulting keys of this
pandas apply function that returns multiple values to rows in pandas dataframe
I have a dataframe with a timeindex and 3 columns containing the coordinates of a 3D vector: I would like to apply a transformation to each row that also returns a vector but if I do: I end up with a Pandas series whose elements are tuples. This is beacause apply will take the result of myfunc without unpacki…
What do the * (star) and ** (double star) operators mean in a function call?
In code like zip(*x) or f(**k), what do the * and ** respectively mean? How does Python implement that behaviour, and what are the performance implications? See also: Expanding tuples into arguments. Please use that one to close questions where OP needs to use * on an argument and doesn’t know it exists…
unpacking an array of arguments in php
Python provides the “*” operator for unpacking a list of tuples and giving them to a function as arguments, like so: This is equivalent to: Does anyone know if there is a way to achieve this in PHP? Some googling for variations of “PHP Unpack” hasn’t immediately turned up anythin…