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Update 09-udf.md

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docs/en/07-develop/09-udf.md
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@ -667,7 +667,7 @@ grep 'sys path' taospyudf.log | tail -1
You may find that the default library search path is `/lib/python3/dist-packages` (just for example, it may be different in your system), but `moment` is installed to `/usr/local/lib/python3.8/dist-packages` (for example, it may be different in your system). Then we change the library search path of python UDF. You may find that the default library search path is `/lib/python3/dist-packages` (just for example, it may be different in your system), but `moment` is installed to `/usr/local/lib/python3.8/dist-packages` (for example, it may be different in your system). Then we change the library search path of python UDF.
Check `sys.path` Check `sys.path`, which must include the packages you install with pip3 command previously, as shown below:
```python ```python
>>> import sys >>> import sys
@ -683,6 +683,8 @@ UdfdLdLibPath /usr/lib/python3.8:/usr/lib/python3.8/lib-dynload:/usr/local/lib/p
Save it, then restart `taosd`, using `systemctl restart taosd`, and test again, it will succeed this time. Save it, then restart `taosd`, using `systemctl restart taosd`, and test again, it will succeed this time.
Note: If your cluster consists of multiple `taosd` instances, you have to repeat same process for each of them.
```sql ```sql
taos> select ts, nextsunday(ts) from t; taos> select ts, nextsunday(ts) from t;
ts | nextsunday(ts) | ts | nextsunday(ts) |