Is there a numpy function that allows you to specify start, step, and number?

Thanks for that question. I had the same issue.
The (from my perspective) shortest and most elegant way is:

import numpy as np
start=0
step=1.25
num=9

result=np.arange(0,num)*step+start

print(result)

returns

[  0.     1.25   2.5    3.75   5.     6.25   7.5    8.75  10.  ]