call site 9 for path.local.readlines
log/testing/test_log.py - line 137
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   def test_log_file_append_mode(self):
       logfilefn = tempdir.join('log_append.out')
   
       # The append mode is on by default, so we don't need to specify it for File
       py.log.setconsumer("default", py.log.Path(logfilefn, append=True, 
                                                   buffering=0))
       assert logfilefn.check()
       py.log.default("hello world #1") 
       lines = logfilefn.readlines() 
       assert lines == ['[default] hello world #1\n']
       py.log.setconsumer("default", py.log.Path(logfilefn, append=True,
                                                   buffering=0))
       py.log.default("hello world #1") 
->     lines = logfilefn.readlines() 
       assert lines == ['[default] hello world #1\n', 
                        '[default] hello world #1\n']