iterating over datastructures in python

1. To iterate over a dictionary in Python:
>>> params = {"server":"mpilgrim", "database":"master", "uid":"sa", "pwd":"secret"}
>>> for (u, v) in params:
... print u+" " +v
...
pwd secret
database master
uid sa
server mpilgrim

2. To iterate over a list:

>>> params = ["server", "mpilgrim", "database", "master", "uid", "sa", "pwd", "secret"]
>>> for elem in params:
... print elem
server
mpilgrim
database
master
uid
sa
pwd
secret

To get the index of the element at the same time, use the following format:
>>> params = ["server", "mpilgrim", "database", "master", "uid", "sa", "pwd", "secret"]
>>> for i in range(len(params)):
... print (i, params[i])
...
(0, 'server')
(1, 'mpilgrim')
(2, 'database')
(3, 'master')
(4, 'uid')
(5, 'sa')
(6, 'pwd')
(7, 'secret')

3. To iterate over a tuple:
the same as the list

4. To iterate over a set:
The same as the list