Python: Length or size of list, tuple, array
How to get the length of a list or tuple or array in Python#
Let me clarify something at the beginning, by
array, you probably mean
list in Python.
Ok, having cleared that, getting the the size of a
array, if you will), is pretty straighforward. You just call the
len() function on the object, and there you have it's size. Examples of list and tuple size / lengths are given below.
Size of list:
>>> fighters = ['bruce', 'chuck', 'benny'] >>> len(fighters) 3
Size of tuple:
>>> movie = ('Terminator', 'James Cameron', 'Arnold Schwarzenegger') >>> len(movie) 3
So there it is, you just call the global function
len() on the
tuple and you get its size / length.
Did you expect to have something like
tuple.len() instead? Actually there is something like that, but it is called
tuple.__len__(). And what
len() really does is, it takes the object and tries to call the objects's
__len__() method. So essentially,
len() works only on objects that has a
__len__() method. If you have a custom object that has the
__len__() method, you can call
len() even on that.
So you learnt: to get the size or length of a
tuple in Python (you probably didn't mean Python
array), you just call the
len() function on the object.
array, probably you mean
- You can make your custom objects return values to the
- Create a custom object which returns weird values for
len()and shock your family and friends.
- Why isn't there
tuple.len(), instead there is