Get sequences of same values within list and count elements within sequences

a python program is a sequence of data and information
t/f a sequence must support element selection.
find sequence of numbers in list python
python count sublist in list
length of nested list python
a(n) _______________ is a span of items that are taken from a sequence.

I'd like to find the amount of values within sequences of the same value from a list:

list = ['A','A','A','B','B','C','A','A']

The result should look like:

result_dic = {A: [3,2], B: [2], C: [1]}

I do not just want the counts of different values in a list as you can see in the result for A.


2.3 Sequences, Element selection can be applied multiple times in order to select a deeply def count(s, value): """Count the number of occurrences of value in sequence s. Calling the list constructor on a range evaluates to a list with the same elements as  Count minimum number of subsets (or subsequences) with consecutive numbers; Count the number of non-increasing subarrays; Count of 'GFG' Subsequences in the given string; Count Distinct Subsequences; Count all subsequences having product less than K; Count subsequences with same values of Bitwise AND, OR and XOR; Count unique subsequences of length K


I'd suggest using a defaultdict and looping through the list.

from collections import defaultdict

sample = ['A','A','A','B','B','C','A','A']

result_dic = defaultdict(list)
last_letter = None
num = 0

for l in sample:
    if last_letter == l or last_letter is None:
        num += 1
    else:
        result_dic[last_letter].append(num)

Edit This is my approach, although I'd have a look at @piRSquared's answer because they were keen enough to include groupby as well. Nice work!

Sequence Containers: Lists and Tuples, write Lists and Tuples. access the individual elements in a sequence with So, to get the fourth element in our slice, we referenced the nonexistent element 5. In the same way that you can bind a new value to a name with an assignment, you appears in a list or tuple, use the count() method, with the element value you  Default sequential containers like list, tuple & string has implementation of __len__() function, that returns the count of elements in that sequence. So, in our case we passed the list object to the len() function. Which internally called the __len__() of the list object, to fetch the count of elements in list.


I'd suggest looping through the list.

result_dic = {}
old_word = ''

for word in list:
    if not word in result_dic:
        d[word] = [1]
    elif word == old_word:
        result_dic[word][-1] += 1
    else:
        result_dic[word].append(1)
    old_word = word

Python Essential Reference, The for x in s operator iterates over all the elements of a sequence and is (For example, it would make little sense to find the maximum value of a list of file changes element 1 of a list to refer to object x, increasing the reference count of x. same values as for slicing and are adjusted to the beginning or end of the list if​  The sequence seq1 has 3 small sequences: [1, 1], [2, 2], and [3, 3, 3]; the sequence seq2 has 2 small sequences, both [1, 1] separated by 0; and the sequence seq3, has 4 small sequences: the first [1, 1], [1, 1, 1], [2, 2], and the second [1, 1]. python sequence. share. |.


Python : Get number of elements in a list, lists of lists or nested list , s : A sequence like object like, list, string, bytes, tuple etc. It returns the length of object i.e. count of elements in the object. Now let's use this len()  In Python programming, sequences are a generic term for an ordered set which means that the order in which we input the items will be the same when we access them. Python supports six different types of sequences. These are strings, lists, tuples, byte sequences, byte arrays, and range objects. We will discuss each of them.


Count the sequence of same values in an array until an new value , Count the sequence of same values in an array until an new value comes up. Follow I need to count every sequence of same values, until a new, different sequence of a value comes up. Then Element: 0 1 -1 Count: 2 2 1 Get RunLength from the File Exchange. You can also select a web site from the following list:  A sequence value is an integer that you can use wherever you would use numeric values. Netezza supports user sequences for the four integer types : byteint, smallint, integer, and bigint. You can even create a sequence with an initial value, an increment, a minimum and a maximum value.


Python Essential Reference: Python Essentia Referenc _4, The for X in s operator iterates over all the elements ofa sequence and is to find the maximum value ofa list of file objects). sum (s) sums all of the items in s but changes element i ofa list to refer to object x, increasing the reference count of same values as for slicing and are adjusted to the beginning or end of the list if  The copy is the same type of object as the original, and it has the same elements in the same order. However, if seqr is empty, like a string or a vector of zero length, the value returned by this function might not be a copy, but an empty object of the same type and identical to seqr .