Python indexing a list -

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i have list below: how do index in python. want fetch value "os"? please let me know.

[{'username': 'd699a1f25d9a3', 'browserversion': none, 'passwordminlength': 0, 'systemautolock': 0, 'os': 'windows 7 6.1 build 7601 : service pack 1 64bit'}] 

  mylist = [{'username': 'd699a1f25d9a3', 'browserversion': none, 'passwordminlength': 0, 'systemautolock': 0, 'os': 'windows 7 6.1 build 7601 : service pack 1 64bit'}]    os = mylist[0]['os']   print os

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