test_futurize.py 文件源码

def test_open(self):
        """
        In conservative mode, futurize would not import io.open because
        this changes the default return type from bytes to text.
        """
        before = """
        filename = 'temp_file_open.test'
        contents = 'Temporary file contents. Delete me.'
        with open(filename, 'w') as f:
            f.write(contents)

        with open(filename, 'r') as f:
            data = f.read()
        assert isinstance(data, str)
        assert data == contents
        """
        after = """
        from past.builtins import open, str as oldbytes, unicode
        filename = oldbytes(b'temp_file_open.test')
        contents = oldbytes(b'Temporary file contents. Delete me.')
        with open(filename, oldbytes(b'w')) as f:
            f.write(contents)

        with open(filename, oldbytes(b'r')) as f:
            data = f.read()
        assert isinstance(data, oldbytes)
        assert data == contents
        assert isinstance(oldbytes(b'hello'), basestring)
        assert isinstance(unicode(u'hello'), basestring)
        assert isinstance(oldbytes(b'hello'), basestring)
        """
        self.convert_check(before, after, conservative=True)