def average(collection, callback=None):
"""Calculate arithmetic mean of each element in `collection`. If callback
is passed, each element of `collection` is passed through a callback before
the mean is computed.
Args:
collection (list|dict): Collection to process.
callback (mixed, optional): Callback applied per iteration.
Returns:
float: Result of mean.
Example:
>>> average([1, 2, 3, 4])
2.5
>>> average([1, 2, 3, 4], lambda x: x ** 2)
7.5
See Also:
- :func:`average` (main definition)
- :func:`avg` (alias)
- :func:`mean` (alias)
.. versionadded:: 2.1.0
"""
return add(collection, callback) / pyd.size(collection)
def average(collection, callback=None):
"""Calculate arithmetic mean of each element in `collection`. If callback
is passed, each element of `collection` is passed through a callback before
the mean is computed.
Args:
collection (list|dict): Collection to process.
callback (mixed, optional): Callback applied per iteration.
Returns:
float: Result of mean.
Example:
>>> average([1, 2, 3, 4])
2.5
>>> average([1, 2, 3, 4], lambda x: x ** 2)
7.5
See Also:
- :func:`average` (main definition)
- :func:`avg` (alias)
- :func:`mean` (alias)
.. versionadded:: 2.1.0
"""
return add(collection, callback) / pyd.size(collection)
def mean_by(collection, iteratee=None):
"""Calculate arithmetic mean of each element in `collection`. If iteratee
is passed, each element of `collection` is passed through a iteratee before
the mean is computed.
Args:
collection (list|dict): Collection to process.
iteratee (mixed, optional): Iteratee applied per iteration.
Returns:
float: Result of mean.
Example:
>>> mean_by([1, 2, 3, 4], lambda x: x ** 2)
7.5
.. versionadded:: 4.0.0
"""
return sum_by(collection, iteratee) / pyd.size(collection)
def test_size(case):
assert _.size(case) == len(case)
def __len__(self):
return _.size(self.storage)
