import turtle
t = turtle.Turtle()
t.shape("turtle")

# Store colors in a list as strings
color_list = [ "yellow", "red", "blue", "green" ]
    
t.fillcolor(color_list[0])   # Set the fill color
t.begin_fill()               # Start filling
t.circle(100)                # Draw a filled circle
t.end_fill()                 # End filling

t.forward(50)
t.fillcolor(color_list[1])   # Set the fill color
t.begin_fill()               # Start filling
t.circle(100)                # Draw a filled circle
t.end_fill()                 # End filling

t.forward(50)
t.fillcolor(color_list[2])   # Set the fill color
t.begin_fill()               # Start filling
t.circle(100)                # Draw a filled circle
t.end_fill()                 # End filling

t.forward(50)
t.fillcolor(color_list[3])   # Set the fill color
t.begin_fill()               # Start filling
t.circle(100)                # Draw a filled circle
t.end_fill()                 # End filling