How can I get svgwrite.drawing() object to reinitialize on each iteration?

I'm an artist trying my hand at some generative art, in the very early learning stages. I have some code that does what's expected on the first iteration, it makes a small svg file consisting of dozens of stacked circles, like tree rings:

import numpy as np
import svgwrite
import os

dwg = svgwrite.Drawing('svgobject',size=('620','620'), profile='full') #position One

n_circles = 3  # will generate n files
max_rad=300    # maxiumu radius, modify with interactive() later
r = 1.0        # starting radius, modify with interactive() later
c=[310,310]    # Center point of circles, modify with interactive() later

for i in range(n_circles):
#    dwg = svgwrite.Drawing('svgobject',size=('620','620'), profile='full') #position Two

    while r < max_rad:   
        step = np.around(np.random.uniform(2, 6),1) # small positive increase in radius
        r += step # increment radius
        dwg.add(dwg.circle(c, r,stroke="black", fill='none')) # append 'svgobject'
        
    n = 0
    while os.path.exists("SVG_Circles%s.svg" % n):
        n += 1
        
    dwg.saveas("SVG_Circles%s.svg" % n,pretty=True)

The problem is, on any subsequent iterations it does one of two things. With dwg = ... at position one I get 3 files that are all the same image, no randomization differing from the first run. At position two, I get the first file just fine, then subsequent files are blank.

I suspect I need to find a way to reinitilize the file-like-object 'svgobject' from svgwrite.Drawing(), but I've put it in more or less every possible location, in every loop, and case one or two is all I get.

So how do I get this to iterate in a way that it will generate the svg file, write it to a unique filename, clear my container/fileobject 'svgobject', and then iterate n_circle times?

Thanks!

I rewrote it, this worked for me:

import numpy as np
import svgwrite
import os

def create_img(file_name):
    n_circles = 3  # will generate n files
    max_rad=300    # maxiumu radius, modify with interactive() later
    r = 1.0        # starting radius, modify with interactive() later
    c=[310,310]    # Center point of circles, modify with interactive() later

    dwg = svgwrite.Drawing(size=('620','620')) #position Two

    while r < max_rad:   
        step = np.around(np.random.uniform(2, 6),1) # small positive increase in radius
        r += step # increment radius
        dwg.add(dwg.circle(c, r,stroke="black", fill='none')) # append 'svgobject'
                
    dwg.saveas(file_name,pretty=True)


files = []

for z in range(3):
    file_name = f"SVG_Circles{z}.svg"
    create_img(file_name)