NameError: name 'def__init__' is not defined

这个错误是因为在定义类的构造函数时，`__init__` 函数名中的 `def` 和 `__init__` 之间缺少了一个空格，应该是 `def __init__(self, input_dim, hidden_dim, output_dim):`。请注意在 Python 中，函数名和关键字之间应该有一个空格来区分它们。

相关问题

Traceback (most recent call last): File "C:/Users/Administrator/Desktop/1.py", line 33, in <module> class SVMStruct: File "C:/Users/Administrator/Desktop/1.py", line 34, in SVMStruct def__init__(self,dataSet,labels,C,toler,kernelOption); NameError: name 'def__init__' is not defined根据错误给出解决方案

这个错误提示是因为在定义SVMStruct类时，初始化函数的定义出现了语法错误。正确的初始化函数应该是这样的：

def __init__(self, dataSet, labels, C, toler, kernelOption):
    self.X = dataSet
    self.labelMat = labels
    self.C = C
    self.tol = toler
    self.m = np.shape(dataSet)[0]
    self.alphas = np.mat(np.zeros((self.m, 1)))
    self.b = 0
    self.eCache = np.mat(np.zeros((self.m, 2)))
    self.K = np.mat(np.zeros((self.m, self.m)))
    for i in range(self.m):
        self.K[:, i] = kernelTrans(self.X, self.X[i, :], kernelOption)

请检查您的代码，确保初始化函数的定义没有语法错误，并且类名和初始化函数名之间有双下划线。

NameError: name '_Disk__name_' is not defined

This error occurs when you try to access a private attribute or method of a class in Python. In this case, it seems like you are trying to access the private attribute `__name__` of a class called `_Disk`.

In Python, any attribute or method that starts with two underscores is considered private and cannot be accessed from outside the class. However, Python does not actually prevent you from accessing these attributes or methods. Instead, it mangles the name by adding `_ClassName` before the attribute name, where `ClassName` is the name of the class.

So, in order to access the private attribute `__name__` of the `_Disk` class, you should use the mangled name `_Disk__name__`.

For example:

class _Disk:
    def __init__(self, name):
        self.__name__ = name

disk = _Disk("MyDisk")
print(disk._Disk__name__)  # Output: "MyDisk"

Note that accessing private attributes or methods is generally not recommended as it can make your code harder to maintain and debug. If possible, you should use public attributes and methods instead.