preserve_dtype_by_default

astropy.units.preserve_dtype_by_default()

Context in which integer input keeps its dtype when creating a Quantity.

Use this for an operation that should not change the dtype of what it is given. Inside astropy, adding a column to a QTable and reconstructing a serialized column both do so, which is why an integer column with a unit keeps its dtype.

An explicit dtype argument is still honored inside the context, and setting the quantity_convert_int_to_float configuration item to always overrides the context, giving the conversion to float of astropy 7.x and earlier.

Examples

>>> import numpy as np
>>> import astropy.units as u
>>> data = np.array([1, 2], dtype="int64")
>>> with u.preserve_dtype_by_default():
...     q = u.Quantity(data, u.ct)
>>> q.dtype
dtype('int64')