$ DHT11_graph.py
from matplotlib import pyplot as plt
from matplotlib import animation
import numpy as np
import time
import Adafruit_DHT
sensor = Adafruit_DHT.DHT11
pin = 4



fig = plt.figure()
ax = plt.axes(xlim=(0, 50), ylim=(15, 45))
line, = ax.plot([], [], lw=1, c='blue',marker='d',ms=2)
max_points = 50
line, = ax.plot(np.arange(max_points),
                np.ones(max_points, dtype=np.float64)*np.nan, lw=1, c='blue',marker='d',ms=2)

def init():
    return line

h, t = Adafruit_DHT.read_retry(sensor, pin)

def get_y() :   
    h, t = Adafruit_DHT.read_retry(sensor, pin)
    return h


def animate(i):

    y = get_y()
   

    old_y = line.get_ydata()
    new_y = np.r_[old_y[1:], y]
    line.set_ydata(new_y)
    print(new_y)
    return line,

anim = animation.FuncAnimation(fig, animate, init_func=init, frames=200, interval=20, blit=False)
plt.show()