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Floating point error handling

Setting and getting error handling

seterr([all, divide, over, under, invalid])	Set how floating-point errors are handled.
geterr()	Get the current way of handling floating-point errors.
seterrcall(func)	Set the floating-point error callback function or log object.
geterrcall()	Return the current callback function used on floating-point errors.
errstate(**kwargs)	Context manager for floating-point error handling.

Internal functions

seterrobj(errobj)	Set the object that defines floating-point error handling.
geterrobj()	Return the current object that defines floating-point error handling.