Clamping floating numbers in Python?

问题

Is there a built-in function for this in Python 2.6?

Something like:

clamp(myValue, min, max)

回答1:

There's no such function, but

max(min(my_value, max_value), min_value)

will do the trick.

回答2:

Numpy's clip function will do this.

>>> import numpy
>>> numpy.clip(10,0,3)
3
>>> numpy.clip(-4,0,3)
0
>>> numpy.clip(2,0,3)
2

回答3:

I think the question is answered but here's an alternative DIY solution if anyone needs it:

def clip(value, lower, upper):
    return lower if value < lower else upper if value > upper else value

(Slightly faster than @Sven Marnach's answer - even when in bounds).

来源：https://stackoverflow.com/questions/9775731/clamping-floating-numbers-in-python