The angular components of a coordinate are represented by objects of the Angle class. These objects can be instantiated on their own anywhere a representation of an angle is needed, and support a variety of ways of representing the value of the angle:
>>> from astropy.coordinates import Angle
>>> a = Angle(1, u.radian)
>>> a
<astropy.coordinates.angles.Angle 57.29578 deg>
>>> a.radians
1
>>> a.degrees
57.29577951308232
>>> a.hours
3.819718634205488
>>> a.hms
(3.0, 49, 10.987083139757061)
>>> a.dms
(57.0, 17, 44.80624709636231)
>>> a.format()
'57d17m44.80625s'
>>> a.format(sep=':')
'57:17:44.80625'
>>> a.format(sep=('deg','m','s'))
'57deg17m44.80625s'
>>> a.format(u.hour)
'3h49m10.98708s'
>>> a.format(u.radian)
'1.0radian'
>>> a.format(u.radian, decimal=True)
'1.0'
Angle objects can also have bounds. These specify either a limited range in which the angle is valid (if it’s <360 degrees), or the limit at which an angle is wrapped back around to 0:
>>> Angle(90, unit=u.degree, bounds=(0,180))
<Angle 90.00000 deg>
>>> Angle(-270, unit=u.degree, bounds=(0,180))
<Angle 90.00000 deg>
>>> Angle(181, unit=u.degree, bounds=(0,180))
BoundsError: The angle given falls outside of the specified bounds.
>>> Angle(361, unit=u.degree, bounds=(0,360))
<Angle 1.00000 deg>
Angles will also behave correctly for appropriate arithmetic operations:
>>> a = Angle(1, u.radian)
>>> a + a
<Angle 114.59156 deg>
>>> a - a
<Angle 0.00000 deg>
>>> a == a
True
>>> a == (a + a)
False
Angle objects can also be used for creating coordinate objects:
>>> ICRSCoordinates(Angle(1, u.radian), Angle(2, u.radian))
<ICRSCoordinates RA=57.29578 deg, Dec=114.59156 deg>
>>> ICRSCoordinates(RA(1, u.radian), Dec(2, u.radian))
<ICRSCoordinates RA=57.29578 deg, Dec=114.59156 deg>