动态调用函数和生成函数（python）

问题描述

以下代码只打印好。为什么生成器函数不执行？
我注意到pdb，执行'handlers1'后，脚本到达与f1的定义的行，但是不在函数内。相反，它返回'GeneratorExit：None'。

The following code only prints "good". Why the generator function is not executed?I noticed with pdb that after executing 'handlers1' the script reaches the line with f1's definition but then does not get inside the function. Conversely, it's returned 'GeneratorExit: None'.

class foo:

   def f0(self, s):
      print s

   def f1(self, s):
      print "not " + s
      yield 1

   def run(self):
      handlers={0 : self.f0, 1 : self.f1}
      handlers[0]('good')
      handlers[1]('good')

bar = foo()
bar.run()

Why this happens? Is it possible to call generator functions in a similar dynamic way?

推荐答案

您需要调用 / code>或生成器中的代码根本不会运行。

You need to call next or the code in the generator won't run at all.

class foo:

   def f0(self, s):
      print s

   def f1(self, s):
      print "not " + s
      yield 1

   def run(self):
      handlers={0 : self.f0, 1 : self.f1}
      handlers[0]('good')
      handlers[1]('good').next()

bar = foo()
bar.run()

打印好然后不好。

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