[jira] [Created] (BEAM-7137) TypeError caused by using str variable as header argument in apache_beam.io.textio.WriteToText

["yoshiki obata (JIRA)" <ji...@apache.org>]

yoshiki obata created BEAM-7137:
-----------------------------------

             Summary: TypeError caused by using str variable as header argument in apache_beam.io.textio.WriteToText
                 Key: BEAM-7137
                 URL: https://issues.apache.org/jira/browse/BEAM-7137
             Project: Beam
          Issue Type: Bug
          Components: sdk-py-core
    Affects Versions: 2.11.0
         Environment: Python 3.5.6
macOS Mojave 10.14.4
            Reporter: yoshiki obata


Using str header to apache_beam.io.textio.WriteToText as argument cause TypeError with Python 3.5.6 - or maybe higher - despite docstring says header is str.
 This error occurred by writing header to file without encoding to bytes at apache_beam.io.textio._TextSink.open.

```
 Traceback (most recent call last):
 File "apache_beam/runners/common.py", line 727, in apache_beam.runners.common.DoFnRunner.process
 File "apache_beam/runners/common.py", line 555, in apache_beam.runners.common.PerWindowInvoker.invoke_process
 File "apache_beam/runners/common.py", line 625, in apache_beam.runners.common.PerWindowInvoker._invoke_per_window
 File "/Users/yob/.local/share/virtualenvs/test/lib/python3.5/site-packages/apache_beam/io/iobase.py", line 1033, in process
 self.writer = self.sink.open_writer(init_result, str(uuid.uuid4()))
 File "/Users/yob/.local/share/virtualenvs/test/lib/python3.5/site-packages/apache_beam/options/value_provider.py", line 137, in _f
 return fnc(self, *args, **kwargs)
 File "/Users/yob/.local/share/virtualenvs/test/lib/python3.5/site-packages/apache_beam/io/filebasedsink.py", line 185, in open_writer
 return FileBasedSinkWriter(self, os.path.join(init_result, uid) + suffix)
 File "/Users/yob/.local/share/virtualenvs/test/lib/python3.5/site-packages/apache_beam/io/filebasedsink.py", line 389, in __init__
 self.temp_handle = self.sink.open(temp_shard_path)
 File "/Users/yob/.local/share/virtualenvs/test/lib/python3.5/site-packages/apache_beam/io/textio.py", line 393, in open
 file_handle.write(self._header)
 TypeError: a bytes-like object is required, not 'str'
 ```



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