无法在Python3的“跟踪”模块中使用动态加载的函数

Question

我想跟踪一个动态加载的函数。通过跟踪，我的意思是使用Python3中可用的trace模块。

我可以使用动态加载的函数，但是trace.run()失败：找不到函数。

这是我的代码：

from trace import Trace
import importlib


class GenerateSequenceDiagram:
    def __init__(self, driver_module):
        self.driver_module = __import__(driver_module)

    def get_functions_called(self, driver_function):
        self.driver_function = getattr(self.driver_module, driver_function)
        self.driver_function()
        # print(dir(self.driver_function))
        # print(self.driver_function.__name__)
        tracer = Trace(countfuncs=1)
        tracer.run('{}()'.format(self.driver_function.__name__))
        results = tracer.results()
        called_functions = results.calledfuncs
        for filename, modulename, funcname in sorted(called_functions):
            print('filename: {}, modulename: {}, funcname: {}'.format(
                filename, modulename, funcname))
        results.write_results()


ob = GenerateSequenceDiagram('driver')
ob.get_functions_called('main_2')

生成的错误是：

NameError: name 'main_2' is not defined
➜  source_code_to_study git:(sequence_diagram) ✗ python3 trace_functions_called.py
Inside main_2 func
False
True
True
Traceback (most recent call last):
  File "trace_functions_called.py", line 25, in <module>
    ob.get_functions_called('main_2')
  File "trace_functions_called.py", line 15, in get_functions_called
    tracer.run('{}()'.format(self.driver_function.__name__))
  File "/usr/local/Cellar/python/3.7.4_1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/trace.py", line 440, in run
    self.runctx(cmd, dict, dict)
  File "/usr/local/Cellar/python/3.7.4_1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/trace.py", line 449, in runctx
    exec(cmd, globals, locals)
  File "<string>", line 1, in <module>
NameError: name 'main_2' is not defined