Best way to shift a list in Python?
I have a list of numbers, let's say :
my_list = [2, 4, 3, 8, 1, 1]
From this list, I want to obtain a new list. This list would start with the maximum value until the end, and I want the first part (from the beginning until just before the maximum) to be added, like this :
my_new_list = [8, 1, 1, 2, 4, 3]
(basically it corresponds to a horizontal graph shift...)
Is there a simple way to do so ? :)
Apply as many as you want,
To the left:
To the right:
Python: Shifting elements in a list to the right and shifting the , You can use negative indices together with list concatenation: def shift(seq, n=0): a = n % len(seq) return seq[-a:] + seq[:-a]. Python: How to shift values in a list To shift values in a list (replace the value at the first place of the list to its last place and vice versa), you need to rearrange the list with two slices. The shift for the list:
How about something like this:
max_idx = my_list.index(max(my_list)) my_new_list = my_list[max_idx:] + my_list[0:max_idx]
How to shift elements in a list in Python, Use collections. deque() on a list to return a dequeue object. Call collections. deque. rotate(n) to shift elements n times to the right if n is positive and left if n is negative. In this tutorial, we will learn how to shift elements in a list to the left in Python with an example. Lists are is ordered and changeable collection. It is very much like arrays, except they are one dimensional and in Python. lists in Python are written with square brackets. One can access the elements using indexes starting from 0 if
Alternatively you can do something like the following,
def shift(l,n): return itertools.islice(itertools.cycle(l),n,n+len(l)) my_list = [2, 4, 3, 8, 1, 1] list(shift(my_list, 3))
Elaborating on Yasc's solution for moving the order of the list values, here's a way to shift the list to start with the maximum value:
# Find the max value: max_value = max(my_list) # Move the last value from the end to the beginning, # until the max value is the first value: while my_list != max_value: my_list.insert(0, my_list.pop())
Python, Python | How to get the last element of list � Python | Three element sum in list � Python | Top N pairs by Kth element from list � Python - Sum of� The list data type has some more methods. Here are all of the methods of list objects: list.append (x) Add an item to the end of the list. Equivalent to a[len(a):] = [x]. list.extend (iterable) Extend the list by appending all the items from the iterable. Equivalent to a[len(a):] = iterable. list.insert (i, x) Insert an item at a given position.
Shift elements in a list to the left in Python, Store the first element in a variable and then, Using the pop method to In this tutorial, we will learn how to shift elements in a list to the left in Python with an� In Python 3, range(5) is a generator, not a list. In Python 2, range(5) is a list, but the shuffle is in place, so it shuffles a temporary list which is immediately thrown away. You can do x = range(5); random.shuffle(x) and then use x.
Python Language, Python Language Shifting a list using slicing. Example#. def shift_list(array, s): """ Shifts the elements of a list to the left or right. Args: array - the list to shift s - the� Method #2 : Using list comprehension + isinstance(). + list slicing This method is similar to the above method, the only modification is that to reduce number of steps, list slicing is used to attach the 0’s to perform whole task in just 1 step.
Shift elements left by n indices in a list, You can condense the for loop in shift with a list slice: the following code left by two places is the same as shifting left by one place twice, so: e.g. Best practice for Python Assert);; Positive n : recursive case, shift and repeat� This is a pretty simple operation but you can get more complex using an array as simply an argument in a formula. For large arrays this can be much faster than a list comprehension and it makes the code cleaner and easier to read (no need to create a function to map in a list comprehension).