爲什麼每次我嘗試運行我的Python程序時，Eclipse都會要求我「構建」？

Question

我是新來編程和使用pydev來在Eclipse中運行我的python。我使用Eclipse EE和Python 2.7.3，我嘗試運行的代碼是在這裏：

def evaluate_poly(poly, x): 

     sumPoly = 0 

     for i in range(0,len(poly)): 
      #calculate each term and add to sum. 
      sumPoly = sumPoly+(poly[i]*x**i) 
     return sumPoly 




def compute_deriv(poly): 

    derivTerm =() 

    #create a new tuple by adding a new term each iteration, assign to derivTerm each time. 
    for i in range(0,len(poly)): 
    #i is the exponent, poly[i] is the coefficient, 
    #coefficient of the derivative is the product of the two. 
     derivTerm = derivTerm + (poly[i]*i,) 
    return derivTerm 



def compute_root(poly, x_0, epsilon): 

    #define root to make code simpler. 
    root = evaluate_poly(poly,x_0) 
    iterations = 0 

    #until root (evaluate_poly) is within our error range of 0... 
    while (root > epsilon) or (root < -epsilon): 
    #...apply newton's method, calculate new root, and count iterations. 
     x_0 = (x_0 - ((root)/(evaluate_poly(compute_deriv(poly),x_0)))) 
     root = evaluate_poly(poly,x_0) 
     iterations = iterations + 1 
    return (x_0,iterations) 

print compute_root((4.0,3.0,2.0),0.1,0.0001) 

每次我嘗試運行月食問我ant構建。當我點擊確定沒有任何反應。這隻發生在我在函數內部運行函數時，它看起來很基本，代碼不是問題。出了什麼問題，我該如何解決這個問題？

Answer 1

如果你擁有的只是函數，python是不會做任何事情的。它不會無緣無故地運行任意函數。如果你想打印出某些東西，你需要調用你的一個函數。最好的方法是將其添加到代碼的底部：

if __name__ == '__main__': 
    evaluate_poly([1, 2, 3], 4)