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I have a piece of code here that is supposed to return the least common element in a list of elements, ordered by commonality The dataframe will come from user input, so i won't know how many columns there will be or what they will be called From collections import counter c = counte.
The first, [:], is creating a slice (normally often used for getting just part of a list), which happens to contain the entire list, and thus is effectively a copy of the list I want to get a list of the column headers from a pandas dataframe The second, list(), is using the actual list type constructor to create a new list which has contents equal to the first list.
The first way works for a list or a string
The second way only works for a list, because slice assignment isn't allowed for strings Other than that i think the only difference is speed It looks like it's a little faster the first way Try it yourself with timeit.timeit () or preferably timeit.repeat ().
Is the a short syntax for joining a list of lists into a single list ( or iterator) in python For example i have a list as follows and i want to iterate over a,b and c. Let summarize the differences between list.of and arrays.aslist list.of can be best used when data set is less and unchanged, while arrays.aslist can be used best in case of large and dynamic data set. Don't use quotes on the command line 1 don't use type=list, as it will return a list of lists this happens because under the hood argparse uses the value of type to coerce each individual given argument you your chosen type, not the aggregate of all arguments
You can use type=int (or whatever) to get a list of ints (or whatever)
Given a dataframe, i want to groupby the first column and get second column as lists in rows, so that a dataframe like A b a 1 a 2 b 5 b 5 b 4 c 6 becomes a [1,2] b [5,5,4] c [6] how do i do this? The list is the part of python's syntax so it doesn't need to be declared whereas you have to declare the array before using it List is an interface, you cannot instantiate an interface, because interface is a convention, what methods should have your classes
In order to instantiate, you need some realizations (implementations) of that interface.
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