with - python number of items in list
How to get the number of elements in a list in Python? (4)
items =  items.append("apple") items.append("orange") items.append("banana") # FAKE METHOD:: items.amount() # Should return 3
How do I get the number of elements in the list?
How to get the size of a list?
To find the size of a list, use the builtin function,
items =  items.append("apple") items.append("orange") items.append("banana")
Everything in Python is an object, including lists. All objects have a header of some sort in the C implementation.
Lists and other similar builtin objects with a "size" in Python, in particular, have an attribute called
ob_size, where the number of elements in the object is cached. So checking the number of objects in a list is very fast.
But if you're checking if list size is zero or not, don't use
len - instead, put the list in a boolean context - it treated as False if empty, True otherwise.
From the docs
Return the length (the number of items) of an object. The argument may be a sequence (such as a string, bytes, tuple, list, or range) or a collection (such as a dictionary, set, or frozen set).
len is implemented with
__len__, from the data model docs:
Called to implement the built-in function
len(). Should return the length of the object, an integer >= 0. Also, an object that doesn’t define a
__nonzero__()[in Python 2 or
__bool__()in Python 3] method and whose
__len__()method returns zero is considered to be false in a Boolean context.
And we can also see that
__len__ is a method of lists:
Builtin types you can get the
len (length) of
And in fact we see we can get this information for all of the described types:
>>> all(hasattr(cls, '__len__') for cls in (str, bytes, tuple, list, xrange, dict, set, frozenset)) True
Do not use
len to test for an empty or nonempty list
To test for a specific length, of course, simply test for equality:
if len(items) == required_length: ...
But there's a special case for testing for a zero length list or the inverse. In that case, do not test for equality.
Also, do not do:
if len(items): ...
Instead, simply do:
if items: # Then we have some items, not empty! ...
if not items: # Then we have an empty list! ...
I explain why here but in short,
if items or
if not items is both more readable and more performant.
And for completeness (taking one for the team with the downvotes), it is possible without using the
len() function (I would not condone this as a good option):
def count(list): item_count = 0 for item in list[:]: item_count = item_count + 1 return item_count count([1,2,3,4,5])
(the colon in
list[:] is implicit, therefore also optional)
len you can also use
operator.length_hint (requires python 3.4+). For normal
list both are equivalent but
length_hint makes it possible to get the length of a list-iterator, which could be useful in certain circumstances:
>>> from operator import length_hint >>> l = ["apple", "orange", "banana"] >>> len(l) 3 >>> length_hint(l) 3 >>> list_iterator = iter(l) >>> len(list_iterator) TypeError: object of type 'list_iterator' has no len() >>> length_hint(list_iterator) 3
length_hint is by definition only a "hint", so most of the time
len is better.
I've seen several answers suggesting accessing
__len__. This is alright when dealing with built-in classes like
list but it could lead to problems with custom classes because
length_hint) implement some safety checks. For example both do not allow negative lengths or lengths that exceed a certain value (the
sys.maxsize value). So it's always safer to use the
len function instead of the