[Python] Writing xyz coordinates in a csv file

I am trying to write the co-ordinates (xyz coordinates) of a double-circle in a csv file.

I have written following code now.

import numpy as np
import matplotlib.pyplot as plt
import csv

bLength=2.10e-10
numPoints=10
totalLength = bLength * numPoints
Circumference = totalLength
radius = Circumference / (2 * np.pi)
totalAngle=360.0
angle = 360.0/numPoints

# define a function frange to include fraction
def frange(start, stop, step):
i = start
while i < stop:
yield i
i += step
# getting the x, y co-ordinates of the two circles displaced by angle/2)
for i in frange(0.0, 360.0, angle):
plt.plot(radius * np.cos(i), radius * np.sin(i), 'bo')
for j in frange(angle/2, 360.0, angle):
plt.plot(radius * np.cos(j), radius * np.sin(j), 'bo')

plt.show()


Here, I get a circle in the graph (in Jupyter Notebook). However, I would like to write the coordinates (xyz) of these circles (double-circle) in a "csv file".

The syntax may be as follow. However, I am not able to proceed further.

with open('data.csv', 'w') as f:
csv.writer(f, delimiter=' ').writerows(f)


The final output should contain three columns. The first two columns of the csv will come from the above "for loops". The third column of the csv file should be some constant (say 0 or 2.1). How can I do this?

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