AttributeError：FUN实例没有属性'__trunc__'

Question

这是我的课FUN，但结果显示AttributeError: FUN instance has no attribute '__trunc__'。请告诉我编码中的错误和修改内容。

import math
import random
import string
import numpy as np
import pickle
from itertools import chain

random.seed(0)

class FUN:
 def __init__(self):
    print "fun"
 # set a random numbers between a & b
 def rand(a, b):
    self.rand = (b-a)*random.random() + a
    return self.rand

 # sigmoid function, tanh ~ 1/(1+e^-x)
 def sigmoid(x):
     self.sig = math.tanh(x)
     return self.sig

 def sigmoid1(x):
    self.sig1 = 1/(1+math.exp(-x))
    return self.sig1

 # derivative of sigmoid function, in terms of the output (y)
 def dsigmoid(y):
    self.dsig = 1.0 - y**2
    return self.dsig
 # getting 2d array
 #def matrix(I, J, fill=0.0):
    #return [[val for col in range(I)] for row in range(J)]
 #obtain a matrix
 def matrix(I, J, fill=0.0):
    m = []
    for i in range(I):
        m.append([fill]*J)
    return m
f = FUN()
print f.matrix(2,3)

上面的代码给出了以下类型的错误：

fun
Traceback (most recent call last):
File "functions.py", line 42, in <module>
 print f.matrix(2,3)
File "functions.py", line 38, in matrix
 for i in range(I):
AttributeError: FUN instance has no attribute '__trunc__'

请帮我解决此错误。

Answer 1

方法将self参数作为第一个参数;您将其命名为I并将其传递给range()，然后FUN会尝试将您的>>> class FUN: pass ... >>> range(FUN()) Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: FUN instance has no attribute '__trunc__' 自定义类的实例转换为整数^†。失败了：

self

添加 def matrix(self, I, J, fill=0.0): 参数：

__init__

您还需要为其他方法执行此操作;除了self方法之外的所有方法都缺失object.__trunc__。

_{^† Python首先尝试object.__int__，然后尝试{{1}}，这种方法令人惊讶地未被记录。只有math.truncate()文档和Numbers Type Hierarchy PEP 3141 proposal提及方法。}