matplotlib - Plotting Unit Circle in Python with contour -

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I am trying to plot a circle with flat function. PTT DER circle (X, Y): Returns (x * x + y * y) xx = np.linspace as my code adheres, 

  NMP as importation Import (-2,2,400) yy = np.linspace (-2,2,400) [x, y] = np. Mcegrid (XX, or Z) = Circle (X, Y) platform () plt.contour (x, y, z, 1) plt.show ()   
 I'm thinking contour function I'll just give the cross section of x ^ 2 + y ^ 2 = 1, but it gives me a circle with 1.5 different radii. Why is it like this? Thanks,   
 
 
 Change it:  
  plt.contour (x, Y, Z, 1)   
 In:  
  plt.contour (x, y, z, [1])   
 If the fourth argument is an integer, then it determines the number of the level for which there is a contour draw, and  contour  chooses the value for those levels if the fourth argument is a sequence , Then the values ​​in the sequence are the level of equality.

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