Python rotate view on any given angle x , y , or z axis Using bpy.context.screen.areas you can get the current view or set the view in  TOP or 1 of the other pre set views like LEFT or BOTTOM

How can i change the view to any given angle in Python?

For example 
I would like to rotate the view 45 degrees X axis and 0 for Y and 0 for Z
or i would like to see 45 degrees on all 3 axis 

in API i was unable to find any that suggest user input to rotate the view
Use rotation matrix

Similarly to object rotation to rotate the view from its current rotation 45 degrees about x axis

Using code from a previous answer

import bpy
from math import radians
from mathutils import Matrix
context = bpy.context

R = Matrix.Rotation(radians(45), 4, 'X')


for area in context.screen.areas:
    if area.type == 'VIEW_3D':
        space = area.spaces.active
        v3d = space.region_3d   
        v3d.view_matrix = R @ v3d.view_matrix
        v3d.view_perspective = 'ORTHO'
        break


To set it to this rotation instead of transforming by set the view rotation (Quaternion)

        v3d.view_rotation = R.to_quaternion()


To set it to an Euler

from mathutils import Euler
q = Euler((radians(45), radians(45), radians(45)), 'XYZ').to_quaternion()
v3d.view_rotation = q