>>> s = frozenset()

>>> s.add("aaa")

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

AttributeError: 'frozenset' object has no attribute 'add'

>>> a = "abcde"

>>> hash(a)

-1767484571

>>> max(11,22,33)

33

>>> min(11,22,33)

11

>>> import math

>>> math.pow(2,3)

8.0

>>> a = reversed('abcdef')

>>> for i in a:

...   print(i)

...

f

e

d

c

b

a

>>> round(3.3)

3

>>> round(3.5)

4

>>> sorted('akfihgke')

['a', 'e', 'f', 'g', 'h', 'i', 'k', 'k']

>>> L = [('b',2),('a',1),('c',3),('d',4)]

>>> sorted(L, key=lambda x:x[1])

[('a', 1), ('b', 2), ('c', 3), ('d', 4)]

>>> print(sorted([5,4,6,3,1], reverse=True))

[6, 5, 4, 3, 1]

>>> print(sorted([5,4,6,3,1], reverse=False))

[1, 3, 4, 5, 6]

>>> x = [1,2,3]

>>> y = [4,5,6]

>>> zipped = zip(x,y)

>>> list(zipped)

[(1, 4), (2, 5), (3, 6)]