如何访问“自我”里面的类的范围？ [英] How to access "self" inside the scope of a class?

问题描述

我遇到了一个有趣的问题。

I've crossed an interesting problem.

假设我们有一个类，在它的构造函数中，我们使用一个布尔作为参数。我如何基于实例的条件/布尔类在类中定义方法？例如：

Suppose we have a class, and in its constructor we take a boolean as an argument. How can I define methods inside the class based on the instance's condition/boolean? For example:

class X():
    def __init__(self, x):
        self.x = x
    if self.x == true: # self is unreachable outside a method.
        def trueMethod():
            print "The true method was defined."
    if self.x == false: # self is unreachable outside a method.
        def falseMethod():
            print "The false method was defined."

推荐答案

不同的名字，并在某些情况下暴露。例如：

You can't, but you can define methods with different names and expose them under certain circumstances. For example:

class X(object):
    def __init__(self, flag):
        if flag:
            self.method = self._method

    def _method(self):
        print "I'm a method!"

测试：

>>> X(True).method()
I'm a method!
>>> X(False).method()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'X' object has no attribute 'method'

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