title: TypeError: 'str' object is not callable Python 3.7.0
body: <p>Sorry guys for wasting your time with a newbie here. Today I ran at a problem . This is my code :</p>
  
  <pre><code>from turtle import *
  shape("turtle")
  
  
  def draw_square(length,color):
  
  for i in range(4):
      forward(length)
      color('color')
      left(90)
  return length,color
  
  
  
  draw_square(100,'red')
  
  
  
  
  mainloop()
  </code></pre>
  
  <p>The project is to draw a turlte square using function with 2 arguments : 'length' and 'color' . 15 mins ago I did succeeded in drawing correctly corresponding to the project requirements . After that , I re-ran the project again then this problem showed up . Im totally dead with this . Can u guys help me out please ? Thank you very much.</p>
  
  <p>This is what VS said to me :</p>
  
  <pre><code>Traceback (most recent call last):
  File "ex3.py", line 15, in &lt;module&gt;
  draw_square(100,'red')
  File "ex3.py", line 9, in draw_square
  color('color')
  TypeError: 'str' object is not callable
  </code></pre>