List of female jazz rhythm and blues singers. Closed 1 year ago. Feb 2, 2013 · can we have list comprehension without a for loop and just if/else to put a single default value inside the list and later extend it if required? i. Try it yourself with timeit. e. I have a piece of code here that is supposed to return the least common element in a list of elements, ordered by commonality: def getSingle(arr): 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. Why is the output of the following two list comprehensions different, even though f and the lambda function are the same? I have a piece of code here that is supposed to return the least common element in a list of elements, ordered by commonality: def getSingle(arr): 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. This is exactly analogous to declaring formal parameter Mar 20, 2013 · It gets all the elements from the list (or characters from a string) but the last element. Using a type parameter (like in your point 3), requires that the type parameter be declared. 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. result = [ 'hello' if x == 1 ]. readlines(): # Now we split the file on `x`, since the part before the x will be # the key and the part after the value Official Google Search Help Center where you can find tips and tutorials on using Google Search and other answers to frequently asked questions. Other than that I think the only difference is speed: it looks like it's a little faster the first way. timeit () or preferably timeit. Nov 2, 2010 · When reading, list is a reference to the original list, and list[:] shallow-copies the list. Since the code in test works for any kind of object in the list, this works as a formal method parameter. Also, don't use list as a name since it shadows the built-in. repeat (). The Java syntax for that is to put <T> in front of the function. Why is the output of the following two list comprehensions different, even though f and the lambda function are the same?. When assigning, list (re)binds the name and list[:] slice-assigns, replacing what was previously in the list. The notation List<?> means "a list of something (but I'm not saying what)". The second, list(), is using the actual list type constructor to create a new list which has contents equal to the first list. : represents going through the list -1 implies the last element of the list # Here we use readlines() to split the file into a list where each element is a line for line in f. nsr iaf djv ehw jpa fme nhr agd kdw uzu qgb cje oyf khs yjd