Python: How to know if two dictionary have the same keys

Question

dic1 = {'a':'a','b':'c','c':'d'}
dic2 = {'b':'a','a':'c','c':'d'}

dic1.keys()    =>['a', 'b', 'c']
dic2.keys()    =>['b', 'a', 'c']

dic1 and dic2 have the same keys, but in different order.

How to tell they have same keys(do not consider the order)?

Answer 1

python 2.7

dict views: Supports direct set operations, etc.

>>> dic1 = {'a':'a','b':'c','c':'d'}
>>> dic2 = {'b':'a','a':'c','c':'d'}
>>> dic1.viewkeys() == dic2.viewkeys()
True
>>> dic1.viewkeys() - dic2.viewkeys()
set([])
>>> dic1.viewkeys() | dic2.viewkeys()
set(['a', 'c', 'b'])

similarly in 3.x: (thx @lennart)

>>> dic1 = {'a':'a','b':'c','c':'d'}
>>> dic2 = {'b':'a','a':'c','c':'d'}
>>> dic1.keys() == dic2.keys()
True
>>> dic1.keys() - dic2
set()
>>> dic1.keys() | dic2
{'a', 'c', 'b'}

python 2.4+

set operation: direct iteration over dict keys into a set

>>> dic1 = {'a':'a','b':'c','c':'d'}
>>> dic2 = {'b':'a','a':'c','c':'d'}
>>> set(dic1) == set(dic2)
True