#!/usr/bin/python3
import matplotlib
matplotlib.use('Agg') #non interactive backend
import matplotlib.pyplot as plt
import numpy as np

def main():
	x=['A','B','C']
	q=np.array(x,dtype='object')
	y=[25,20,40]
	z=np.array(y)
	plt.bar(q,z,color=['red','blue','green'])
	plt.xlabel('Value')
	plt.ylabel('Freq')
	plt.title('Bar Plot')
	plt.savefig("graf4.png",dpi=300,transparent=True)
if __name__=="__main__":
	main()