new_contents: import matplotlib.pyplot as plt
  import math
  
  
  if __name__ == "__main__":
  	# prepare data 
  	x = [float(i) / 100 for i in range(1, 300)]
  	y = [math.log(i) for i in x]
  	# plot
  	plt.plot(x, y, 'r-', linewidth=3, label='log curve')
  
  	# prepare data
  	p1 = 20
  	p2 = 175
  	a = [x[p1], x[p2]]
  	b = [y[p1], y[p2]]
  	# plot
  	plt.plot(a, b, 'g-', linewidth=2)
  	plt.plot(a, b, 'b*', markersize=15, alpha=0.5)
  
  	# config 
  	plt.legend(loc='upper left')
  	plt.grid(True)
  	plt.xlabel('x')
  	plt.ylabel('log(x)')
  
  	# show
  	plt.show()
  
subject: add july class, and first script of pyplot