List Comprehensions
li = [1, 9, 8, 4]
[elem*2 for elem in li]
#Result: [2, 18, 16, 8]
[k for k, v in params.items()] # ['server', 'uid', 'database', 'pwd']
[v for k, v in params.items()] # ['mpilgrim', 'sa', 'master', 'secret']
["%s=%s" % (k, v) for k, v in params.items()] #['server=mpilgrim', 'uid=sa', 'database=master', 'pwd=secret']