[python] Python - Count elements in list

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.

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

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len(myList) should do it.

len works with all the collections, and strings too.

len()

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

just do len(MyList)

This also works for strings, tuples, dict objects.

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

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

>>> l.__len__() 
3

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.

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