4 examples of 'python is nan' in Python

22
def is_nan(builder, z):
23
    return builder.fcmp_unordered('uno', z.real, z.imag)

59
def is_scalar_nan(x):
60
    """Tests if x is NaN
61
    This function is meant to overcome the issue that np.isnan does not allow
62
    non-numerical types as input, and that np.nan is not np.float('nan').
63
    Parameters
64
    ----------
65
    x : any type
66
    Returns
67
    -------
68
    boolean
69
    Examples
70
    --------
71
    >>> is_scalar_nan(np.nan)
72
    True
73
    >>> is_scalar_nan(float("nan"))
74
    True
75
    >>> is_scalar_nan(None)
76
    False
77
    >>> is_scalar_nan("")
78
    False
79
    >>> is_scalar_nan([np.nan])
80
    False
81
    """
82
83
    # convert from numpy.bool_ to python bool to ensure that testing
84
    # is_scalar_nan(x) is True does not fail.
85
    # Redondant np.floating is needed because numbers can't match np.float32
86
    # in python 2.
87
    return bool(isinstance(x, (numbers.Real, np.floating)) and np.isnan(x))

82
def _is_nan(log):
83
    return math.isnan(log.current_row['total_gradient_norm'])

413
def test_nan(sentry_init, capture_events):
414
    sentry_init()
415
    events = capture_events()
416
417
    try:
418
        nan = float("nan")  # noqa
419
        1 / 0
420
    except Exception:
421
        capture_exception()
422
423
    (event,) = events
424
    frames = event["exception"]["values"][0]["stacktrace"]["frames"]
425
    (frame,) = frames
426
    assert frame["vars"]["nan"] == "nan"