python - 'Type Error: Not implemented for this type' when trying to make a Scatter plot in matplotlib -

this first matplotlib program, sorry in advance if seems dumb question.

i'm trying setup basic serial connection between arduino , raspberry pi. planning on starting off simple, sending numbers rpi arduino board, having calculate (squaring in case) , sending numbers rpi plot values individually.

here arduino code:

void setup(){    serial.begin(9600); }  void loop(){    if(serial.available() > 0){       int inc = serial.parseint();       inc = pow(inc,2);       serial.println(inc);    } } 

and here rpi code:

import serial ser = serial.serial('/dev/ttyacm0',9600) import matplotlib.pyplot plt  plt.axis([0,20,0,400]) plt.ion() plt.show()  in range(20):    ser.write(str(i))    y=int(ser.readline())    plt.scatte([i],[y],'bo')    plt.draw() 

everything seems work fine in loop, keep getting error message saying "type error: not implemented type" referring 'plt.draw()' function

any appreciated!

it because calling plt.scatter 'bo' inside.

the above works plt.plot !! i.e. specifying both marker style , colour together.

whereas plt.scatter should instead call way:

plt.scatter([i],[y],c='b',marker='o') 

this work!