import serial
import matplotlib.pyplot as plt

ser = serial.Serial("COM3", 9600)

num_values = int(input("kolik dat načíst?"))

values = []

while True:
    for i in range(num_values):
        line = ser.readline().decode("utf-8").strip()
        name, value = line.split(":")
        values.append(int(value))
        print(i)

    plt.plot(values)
    plt.show()

    values = []

    if input("q?") == "q":
        break