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2.23 快速打印函数的调用栈

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在使用pdb时，手动打印调用栈

import traceback
traceback.print_stack(file=sys.stdout)

或者直接使用 where （更简单的直接一个 w）：https://stackoverflow.com/questions/1156023/print-current-call-stack-from-a-method-in-python-code

(Pdb) where
  /usr/lib/python2.7/site-packages/eventlet/greenpool.py(82)_spawn_n_impl()
-> func(*args, **kwargs)
  /usr/lib/python2.7/site-packages/eventlet/wsgi.py(719)process_request()
-> proto.__init__(sock, address, self)
  /usr/lib64/python2.7/SocketServer.py(649)__init__()
-> self.handle()
  /usr/lib64/python2.7/BaseHTTPServer.py(340)handle()
-> self.handle_one_request()
  /usr/lib/python2.7/site-packages/eventlet/wsgi.py(384)handle_one_request()
-> self.handle_one_response()
  /usr/lib/python2.7/site-packages/eventlet/wsgi.py(481)handle_one_response()

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