Def不起作用

Question

不知道为什么这段代码不起作用.

class convert_html(sublime_plugin.TextCommand):
  def convert_syntax(self, html, preprocessor)
    return "this is just a " + preprocessor + " test"

  def convert_to_jade(self, html):
    return self.convert_syntax(html, "jade")

  def run(self, edit):
    with open(self.view.file_name(), "r") as f:
      html = f.read()
      html = html.convert_to_jade(html)
      print(html)

它说 AttributeError: 'str' object has no attribute 'convert_html'

我如何使其工作？

Answer 1

您需要convert_to_jade()使用self变量调用该方法,该变量充当对类的当前对象的引用.非常类似于或中的this指针C++java

  html = self.convert_to_jade(html)

Python在调用时隐式地将此实例句柄作为方法的第一个参数传递self.something().如果没有实例句柄(即self),您将无法访问任何实例变量.

顺便说一句,并不是必须将实例方法的第一个参数命名为self,但它是一种常用的约定.

更多关于self 这里

以下代码应该有效:

class convert_html(sublime_plugin.TextCommand):
  def convert_syntax(self, html, preprocessor):
    return "this is just a " + preprocessor + " test"

  def convert_to_jade(self, html):
    return self.convert_syntax(html, "jade")

  def run(self, edit):
    with open(self.view.file_name(), "r") as f:
      html = f.read()
      html = self.convert_to_jade(html)
      print(html)