Python：max不带关键字参数

Question

I am trying to print the max of two lists as such:

print max([3,4,5,0]), max([3,4,-5,0], key = abs)

and I get the error "max() takes no keyword arguments"

I'm using Python 2.4.3

What's going on?

Thanks!

Answer 1

You are using a python feature not yet supported in Python 2.4. From the max() documentation :

Changed in version 2.5: Added support for the optional key argument.

You'll have to use a decorate, undecorate pattern, using a python list comprehension:

max([(abs(i), i) for i in [3,4,-5,0]])[1]