New to programming, same result different program

I'm taking my first course in programming, the course is meant for physics applications and the like. We have an exam coming up, my professor published a practice exam with the following question.

The Maxwell distribution in speed v for an ideal gas consisting of particles of mass m at Kelvin temperature T is given by:

Stackoverflow doesn't use MathJax for formula's, and I can't quite figure out how to write a formula on this site. So, here is a link to WolframAlpha:

where k is Boltzmann's constant, k = 1.3806503 x 10-23 J/K.

Write a Python script called maxwell.py which prints v and f(v) to standard output in two column format. For the particle mass, choose the mass of a proton, m = 1.67262158 10-27 kg. For the gas temperature, choose the temperature at the surface of the sun, T = 5778 K.

Your output should consist of 300 data points, ranging from v = 100 m/s to v = 30,000 m/s in steps of size dv = 100 m/s.

So, here is my attempt at the code.

import math as m
import sys

def f(v):
    n = 1.67262158e-27 #kg
    k = 1.3806503e-23 #J/K 
    T = 5778 #Kelvin
    return (4*m.pi)*((n/(2*m.pi*k*T))**(3/2))*(v**2)*m.exp((-n*v**2)/(2*k*T))

v = 100 #m/s
for i in range(300):
   a = float(f(v))
   print (v, a)
   v = v + 100

But, my professors solution is:

import numpy as np
def f(v):     
    m = 1.67262158e-27  # kg     
    T = 5778.           # K     
    k = 1.3806503e-23   # J/K    
    return 4.*np.pi * (m/(2.*np.pi*k*T))**1.5 * v**2 * np.exp(-m*v**2/(2.*k*T))

v = np.linspace(100.,30000.,300) 
fv = f(v) 
vfv = zip(v,fv) 
for x in vfv:     
    print "%5.0f %.3e"%x
    # print np.sum(fv*100.)

So, these are very different codes. From what I can tell, they produce the same result. I guess my question is, simply, why is my code incorrect?

Thank you!

EDIT:

So, I asked my professor about it and this was his response.

I think your code is fine. It would run much faster using numpy, but the problem didn't specify that you needed numpy. I might have docked one point for not looping through a list of v's (your variable i doesn't do anything). Also, you should have used v += 100. Almost, these two things together would have been one point out of 10.

1st: Is there any better syntax for doing the range in my code, since my variable i doesn't do anything?

2nd: What is the purpose of v += 100?