Python's max(arg1, arg2, ..., key=func)
Posted by they4kman on Saturday, May 16, 2009 at 12:16 a.m. (1 year, 2 months ago)
I stumbled across a somewhat undocumented feature of Python's max() function. I was trying to find the largest absolute item in a list, and just as I was about to create a generator list composition for it,
[abs(x) for x in mylist]
I looked at the documentation for max() in ipython, and found an argument not in the online Python documentation: key. 'key' is a keyword parameter accepting a function with one argument. This function does whatever the hell it wants to every number passed to max() and then returns it. This simplified what I needed to do:
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