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Update getdata.rst

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@@ -127,7 +127,7 @@ For example, it looks quite long and complicated:
.. code-block:: python .. code-block:: python
>> from qlib.data import D >> from qlib.data import D
>> data = D.features(["sh600519"], ["(($high / $close) + ($open / $close)) * (($high / $close) + ($open / $close)) / ($high / $close) + ($open / $close)"], start_time="20200101") >> data = D.features(["sh600519"], ["(($high / $close) + ($open / $close)) * (($high / $close) + ($open / $close)) / (($high / $close) + ($open / $close))"], start_time="20200101")
But using string is not the only way to implement the expression. You can also implement expression by code. But using string is not the only way to implement the expression. You can also implement expression by code.