refreshing the cache time of a key

[bharath venkatesh]

hi ..
   is it possible to refresh the cache time of a key with out having to
retrieving the cached data and storing it back in memcache .. for example if
a data is cached for
1 hour and  at the 50th minute from the time this data has been  cached i
want to   store it in the cache for  1  more  hour  ..is there a  function
to  refresh the cache time by knowing the key of data with out having to do
get and set
i.e
data=mc.get(key)
mc.set(key,data,3600) # 1 more  hour
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