On Thu, 17 Mar 2011 08:07:28 -0700, Wanderer wrote:
> I have a dll that to communicate with I need to send numeric codes. So I
> created a dictionary. It works in one direction in that I can address
> the key and get the value. But when the program returns the value I
> can't get the key.
If you only have a few keys:
def find_key(value, d):
"""Return the key in dictionary d that has the given value.
If there are multiple keys with the same value, return an
arbitrarily chosen one."""
for k, v in d.items():
if v == value: return k
raise KeyError('no such value found')
If you have many keys/values, then simply create a reverse dictionary:
Rev_QCam_Info = {}
for key, value in QCam_Info.items():
Rev_QCam_Info[value] = key
and then search that.
--
Steven
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