Python - Count elements in list

Question

I am trying to find a simple way of getting a count of the number of elements in a list:

MyList = ["a", "b", "c"]

I want to know there are 3 elements in this list.

Answer 1

len()

>>> someList=[]
>>> print len(someList)
0

Answer 2

just do len(MyList)

This also works for strings, tuples, dict objects.

Answer 3

len(myList) should do it.

len works with all the collections, and strings too.

Answer 4

len() 

it will count the element in the list, tuple and string and dictionary, eg.

>>> mylist = [1,2,3] #list
>>> len(mylist)
3
>>> word = 'hello' # string 
>>> len(word)
5
>>> vals = {'a':1,'b':2} #dictionary
>>> len(vals)
2
>>> tup = (4,5,6) # tuple 
>>> len(tup)
3

To learn Python you can use byte of python , it is best ebook for python beginners.

Answer 5

To find count of unique elements of list use the combination of len() and set().

>>> ls = [1, 2, 3, 4, 1, 1, 2]
>>> len(ls)
7
>>> len(set(ls))
4

Answer 6

You can get element count of list by following two ways:

>>> l = ['a','b','c']
>>> len(l)
3

---

>>> l.__len__() 
3

Answer 7

Len won't yield the total number of objects in a nested list (including multidimensional lists). If you have numpy, use size(). Otherwise use list comprehensions within recursion.