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import collections

import sys

prev_line = 0

prev_filename = ''

data = collections.defaultdict(set)

def trace(frame, event, arg):

if event != 'line':

return trace

global prev_line

global prev_filename

func_filename = frame.f_code.co_filename

func_line_no = frame.f_lineno

if func_filename != prev_filename:

# We need a way to keep track of inter-files transferts,

# and since we don't really care about the details of the coverage,

# concatenating the two filenames in enough.

data[func_filename + prev_filename].add((prev_line, func_line_no))

else:

data[func_filename].add((prev_line, func_line_no))

prev_line = func_line_no

prev_filename = func_filename

return trace

def get_coverage():

return sum(map(len, data.values()))