的Python - 类型错误：不受约束的方法beamDeflection（）必须与梁例如被称为第一个参数（有替代列表实例）

Question

在Python，我想在一个类中运行的功能，并出现以下错误：

Traceback (most recent call last): 
    File "<stdin>", line 1, in <module> 
    File "C:/Users/X/Downloads/beamModel.py", line 58, in getTotalDeflection 
    beam.beamDeflection(loadsList, x) 
TypeError: unbound method beamDeflection() must be called with beam instance as first argument (got list instance instead) 

代码：beamModel.py：

class beam(object): 

    def __init__(self, E, I, L): 
     self.E = E 
     self.I = I 
     self.L = L 
     self.Loads = [(0.0, 0.0)] #[(Force, distance along beam)] 

    def beamDeflection(self, Load, x): 
     """Calculates defeclection at point x due to single load""" 
     Force, distance = Load 
     L = self.L 
     E = self.E 
     I = self.I 
     b = L - distance 
     i = (Force*b)/(6*L*E*I) 
     j = ((L/b)*(x-distance)**3 - x**3 + (L**2 - b**2)*x) 
     k = (L**2 - x**2 - b**2) 
     if x > distance: 
      return i*j 
     else: 
      return i*k 

    def getTotalDeflection(self, x): 
    """Calculate total deflection of beam due to multiple loads""" 
     loadsList = self.Loads 
     beam.beamDeflection(loadsList, x) 

现在我需要运行通过函数beamDeflection元组（这是工作）的列表，总结的结果给我的总挠度值，应由函数getTotalDeflection返回。

编辑：

我改变了getTotalDeflection功能：

def getTotalDeflection(self, x): 
    """Calculate total deflection of beam due to multiple loads 
    """ 
    loadsList = self.Loads 
    self.beamDeflection(loadsList, x) 

这是现在给我的错误：

Traceback (most recent call last): 
    File "<stdin>", line 1, in <module> 
    File "C:/Users/X/Downloads/beamModel.py", line 58, in getTotalDeflection 
    self.beamDeflection(loadsList, x)   
    File "C:/Users/X/Downloads/beamModel.py", line 39, in beamDeflection 
    Force, distance = Load 
ValueError: need more than one value to unpack 

Answer 1

的问题可能是因为您所呼叫beamDeflection()不是在beam的实例上，而是在静态的beam类本身上。

假设的问题，你很可能重写getTotalDeflection方法，像这样：

def getTotalDeflection(self, x): 
"""Calculate total deflection of beam due to multiple loads""" 
    loadsList = self.Loads 
    self.beamDeflection(loadsList, x)