"Collapsing" a list into a list of changes

[Fredrik Lundh]

*You* are cheating when you take a predefined function implemented in C
(operator.mul) and then claim you are using pure Python.

operator is a standard module in Python. if you have a desperate need
to be pointless in public, consider using another newsgroup.

</F>

 

[Peter Otten]

operator is a standard module in Python. if you have a desperate need
to be pointless in public, consider using another newsgroup.

</F>

No.

Peter

 

[Raymond Hettinger]

[Alan McIntyre]

I have a list of items that has contiguous repetitions of values, but
the number and location of the repetitions is not important, so I just
need to strip them out. For example, if my original list is
[0,0,1,1,1,2,2,3,3,3,2,2,2,4,4,4,5], I want to end up with [0,1,2,3,2,4,5].

import itertools
[k for k, v in itertools.groupby(lst)]

[0, 1, 2, 3, 2, 4, 5]


Raymond Hettinger