numpy.ma.default_fill_value

ma.default_fill_value(obj) [source]

Return the default fill value for the argument object.

The default filling value depends on the datatype of the input array or the type of the input scalar:

datatype

default

bool

True

int

999999

float

1.e20

complex

1.e20+0j

object

‘?’

string

‘N/A’

For structured types, a structured scalar is returned, with each field the default fill value for its type.

For subarray types, the fill value is an array of the same size containing the default scalar fill value.

Parameters
objndarray, dtype or scalar

The array data-type or scalar for which the default fill value is returned.

Returns
fill_valuescalar

The default fill value.

Examples

>>> np.ma.default_fill_value(1)
999999
>>> np.ma.default_fill_value(np.array([1.1, 2., np.pi]))
1e+20
>>> np.ma.default_fill_value(np.dtype(complex))
(1e+20+0j)

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https://numpy.org/doc/1.20/reference/generated/numpy.ma.default_fill_value.html