How to return a count of values in a list of lists

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I'm trying to return the number of values that are in each list, which are housed in a bigger list.

l = [(32, -59), (33, -58)], 
    [(33, -58), (28, 17), (27, 81)], 
    [(33, 28), (95, 49)], 
    [(76, 9), (33, 4)]

I have tried to use (sum(x.count('value') for x in l)) but this just returns the count of a single value.

I'm hoping to return:

2,3,2,2

I'm not too fussed what format it's in. Although, I'll eventually convert it to a df:

    1  2  3  4
 0  2  3  2  2

Just use lenfunction:

l = [[(32, -59), (33, -58)],
    [(33, -58), (28, 17), (27, 81)], 
    [(33, 28), (95, 49)], 
    [(76, 9), (33, 4)]]
for i in l:
    print(len(i))

output:

2
3
2
2

Python : Get number of elements in a list, lists of lists or nested list , It returns the length of object i.e. count of elements in the object. Now we want to count all the elements in the list i.e. total numbers in list. To create a count of the values that appear in in a list or table, you can use the COUNTIFS function. In the example shown, the formula in D5 is: = COUNTIFS ( B:B , B5 , C:C , C5 )

you have a very simple solution using len() :

>>> l = [[(32, -59), (33, -58)], 
...     [(33, -58), (28, 17), (27, 81)], 
...     [(33, 28), (95, 49)], 
...     [(33, 28), (95, 78)]]
>>> lengths=[len(a) for a in l]
>>> lengths
[2, 3, 2, 2]

Python, Python - Convert Key-Value list Dictionary to List of Lists · Python | Ways to sum list of lists and return sum list · Python | Maximum sum of elements of list in a list of  The count() method returns the number of occurrences of an element in a list. In simple terms, count() method counts how many times an element has occurred in a list and returns it. The syntax of count() method is: count() Parameters. The count() method takes a single argument: element - element whose count is to be found.

You need to use len to get the size of an array.

Ex:

l = [[(32, -59), (33, -58)], 
    [(33, -58), (28, 17), (27, 81)], 
    [(33, 28), (95, 49)], 
    [(76, 9), (33, 4)]]

print( [len(i) for i in l] )

Output:

[2, 3, 2, 2]

Python, list containing a certain element. # in a list of lists. def countList(lst, x):. count = 0. for i in range ( len (lst)):. if x in lst[i]:. count + = 1. return count. # Driver Code. Use List comprehension to count elements in list of lists. Iterate over the list of lists using List comprehension. Build a new list of sizes of internal lists. Then pass the list to sum() to get total number of elements in list of lists i.e.

You can map :

l = [[(32, -59), (33, -58)],
    [(33, -58), (28, 17), (27, 81)],
    [(33, 28), (95, 49)],
    [(76, 9), (33, 4)]]


print(list(map(len,l)))

output:

[2, 3, 2, 2]

Python List count(), Return value from count(). The count() method returns the number of occurrences of an element in a list. Example  Gets the number of elements contained in the List<T>. The number of elements contained in the List<T>. The following example demonstrates how to check the capacity and count of a List<T> that contains a simple business object, and illustrates using the TrimExcess method to remove extra capacity. using System; using System.Collections.Generic

Python Lists, List. A list is a collection which is ordered and changeable. In Python lists are written with When specifying a range, the return value will be a new list with the specified items. count(), Returns the number of elements with the specified value. Arrange the lists in two columns with List A in column A and List B in column B. Create a third column in column D called List C (leave column C blank for easier readability). In cell D5 enter the formula: =IF(COUNTIF(B:B,A5),A5,0) and press Enter. Enter formula into cell D5.

Math & Counting Operations on Lists—Wolfram Language , Math & Counting Operations on Lists automatically operate in parallel on list elements CountDistinctBy — count distinct values from applying a function. Extract Unique List of Values based on Criteria. Assuming that you have a list of data in range A1:C6, in which contain price data for each product. And you want to extract a unique product list from this range and return non-duplicates that are unique based on the month value. For example, you want to extract a product name list based on Jan month.

Count list elements in Python · Lulu's blog, How to count elements in lists in Python, count occurrences or test if a given value exists in a list. Learn Python functions len or count. The second COUNTIF function is comparing the source list to itself to count the number of instances of each value. Where the count is greater than or equal to 2 (i.e., it is a duplicate value) TRUE will be returned, otherwise it will return FALSE. As we now have two lists of TRUE/FALSE we can multiply these together.

Comments
  • print( [len(i) for i in l] )
  • print(map(len, l))