What is len

Question

In many of the python codes, I discovered that there was a command language called "len".I wonder what it is....

Answer 1

it's returns length of objects or parameters
a=[1,2,3,4]
print len(a) #4 no of elements
b='hello'
print len(b) #5 no of characters

Answer 2

I think that is length.

Answer 3

len means length.
it calculates the length of the list:

list = [1,2,3,4,5,6,7]
print(len(list))

#outputs 7