Floating point error handling

Setting and getting error handling

seterr ([all, divide, over, ...]) 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.

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