Primes probability

primes_prob.py

import numpy as np
import matplotlib.pyplot as plt
import sympy as sp
import progressbar

def numOfPrimesBellow(n):
#   primeArray = []
# 	for i in range(n):
# 		if i in sp.sieve:
# 			primeArray.append(i)
# 	return primeArray
	return list(sp.sieve.primerange(1, n))
const = int(input("Input number: "))
print("Latest value: " + str(len(numOfPrimesBellow(const))/const))
if input("Do I graph? [y/n]") == "y":
	x = np.arange(1, const)
	y = []
	bar = progressbar.ProgressBar(widgets=[
	    ' [', progressbar.Timer(), '] ',
	    progressbar.Bar(),
	    ' (', progressbar.ETA(), ') ',
	])
	for i in x:
		y.append(len(numOfPrimesBellow(i))/i)
		if i % (const/100) == 0:
			bar.update(i*100/const)
	plt.plot(x,y)
	plt.title("Probability of getting a prime number\nrandomly")
	plt.savefig(str(input("Name of the fig: ")), dpi=int(input("dpi: ")))

Here is the renders