动态调用函数和生成函数（python） [英] dynamic call of functions and generator function (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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