In [62]: y={100:1, 90:4, 99:3, 92:1, 101:1}
In [63]: sorted(y.items(), key=lambda x: (x[1],x[0]), reverse=True)
Out[63]: [(90, 4), (99, 3), (101, 1), (100, 1), (92, 1)]
The key=lambda x: (x[1],x[0])
tells sorted
that for each item x
in y.items()
, use (x[1],x[0])
as the proxy value to be sorted. Since x
is of the form (key,value)
, (x[1],x[0])
yields (value,key)
. This causes sorted
to sort by value
first, then by key
for tie-breakers.
reverse=True
tells sorted
to present the result in descending, rather than ascending order.
See this wiki page for a great tutorial on sorting in Python.
PS. I tried using key=reversed
instead, but reversed(x)
returns an iterator, which does not compare as needed here.
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