NameError: name '_name_' is not defined

这个错误通常是因为代码中写错了 `__name__` 的变量名，正确的写法是两个下划线，一个单词。

在 Python 中，`__name__` 是一个特殊的全局变量，表示当前模块的名称。当 Python 解释器执行一个脚本文件时，会把该脚本文件的 `__name__` 设为 `"__main__"`，表示该模块是主模块。如果在一个模块中写了 `if __name__ == "__main__":`，则表示这个模块是作为主程序运行的，会执行这个条件语句块中的代码。

相关问题

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.

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。