>>> a=[1,2,3]
>>> for i, v in enumerate(a):
... print(i,":",v)
...
0 : 1
1 : 2
2 : 3
>>> b= (2,4,6)
>>> for i,j in zip(a,b):
... print(i,";",j)
...
1 ; 2
2 ; 4
3 ; 6
>>> a=[1,2,3,4]
>>> [2*i for i in a]
[2, 4, 6, 8]
>>> b=['a','b','c']
>>> {k:v for k,v in zip(b,a)}
{'a': 1, 'b': 2, 'c': 3}
>>> {2*i for i in a}
{8, 2, 4, 6}
>>> [2*i for i in a if i % 3 != 0]
[2, 4, 8]
>>>