Python find print/ найти принт

ex_exc.py

import sys
import traceback

class TracePrints(object):
  def __init__(self):    
    self.stdout = sys.stdout
  def write(self, s):
    self.stdout.write("Writing %r\n" % s)
    traceback.print_stack(file=self.stdout)

sys.stdout = TracePrints()

def a():
  print "I am here"

def b():
  a()

b()

# look for print in the exception message
# based on https://stackoverflow.com/a/1620686/7127824