Our little drawing example but with the ability to save. Check your project folder to find the actual files.

P5__DRAWINGwithSAVE.py

drawing = False

def setup():
    size(500,500)
    background(240)
    
    stroke(220,0, 220)
    strokeWeight(20)

def draw():
    global drawing

    if drawing is True:
        line(pmouseX, pmouseY, mouseX, mouseY)

def mousePressed():
    global drawing
    
    if drawing is False:
        drawing = True

def mouseReleased():
    global drawing 
    
    if drawing is True:
        drawing = False
        
def keyReleased():
    if key == 'e':
        background(240)
        
    if key == 's':
        saveFrame('screen__#####.png')