numpy.errstate

class numpy.errstate(**kwargs)

Context manager for floating-point error handling.

Using an instance of errstate as a context manager allows statements in that context to execute with a known error handling behavior. Upon entering the context the error handling is set with seterr and seterrcall, and upon exiting it is reset to what it was before.

Changed in version 1.17.0: errstate is also usable as a function decorator, saving a level of indentation if an entire function is wrapped.

Changed in version 2.0: errstate is now fully thread and asyncio safe, but may not be entered more than once. It is not safe to decorate async functions using errstate.

Parameters:

kwargs{divide, over, under, invalid}

Keyword arguments. The valid keywords are the possible floating-point exceptions. Each keyword should have a string value that defines the treatment for the particular error. Possible values are {‘ignore’, ‘warn’, ‘raise’, ‘call’, ‘print’, ‘log’}.

See also

seterr, geterr, seterrcall, geterrcall

Notes

For complete documentation of the types of floating-point exceptions and treatment options, see seterr.

Examples

>>> import numpy as np
>>> olderr = np.seterr(all='ignore')  # Set error handling to known state.

>>> np.arange(3) / 0.
array([nan, inf, inf])
>>> with np.errstate(divide='ignore'):
...     np.arange(3) / 0.
array([nan, inf, inf])

>>> np.sqrt(-1)
np.float64(nan)
>>> with np.errstate(invalid='raise'):
...     np.sqrt(-1)
Traceback (most recent call last):
  File "<stdin>", line 2, in <module>
FloatingPointError: invalid value encountered in sqrt

Outside the context the error handling behavior has not changed:

>>> np.geterr()
{'divide': 'ignore', 'over': 'ignore', 'under': 'ignore', 'invalid': 'ignore'}
>>> olderr = np.seterr(**olderr)  # restore original state

Methods

__call__(func)

Call self as a function.