The function export_datasources parameter is print_stdout, if you use print, it
will cause error, like:
```
return callback(*args, **kwargs)
File
"/Users/yongjie.zhao/.virtualenvs/incubator-superset-py3/lib/python3.6/site-packages/click/decorators.py",
line 17, in new_func
return f(get_current_context(), *args, **kwargs)
File
"/Users/yongjie.zhao/.virtualenvs/incubator-superset-py3/lib/python3.6/site-packages/flask/cli.py",
line 257, in decorator
return __ctx.invoke(f, *args, **kwargs)
File
"/Users/yongjie.zhao/.virtualenvs/incubator-superset-py3/lib/python3.6/site-packages/click/core.py",
line 535, in invoke
return callback(*args, **kwargs)
TypeError: export_datasources() got an unexpected keyword argument 'print'
```
and click version is 6.7
[ Full content available at:
https://github.com/apache/incubator-superset/pull/5809 ]
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