Github user Leemoonsoo commented on the issue:
https://github.com/apache/zeppelin/pull/2106
Tested `%python.conda` and `%python.pandasql` and it works well.
Could you restore PythonDockerInterpreter.java and
PythonDockerInterpreterTest.java for `%python.docker` as well?
To make it work, i think we need to let docker container mount directory
that py4j exists using -v option, and then set PYTHONPATH env variable to load
py4j library using -e option.
So this line
```java
setPythonCommand("docker run -i --rm " + image + " python -iu");
```
can be updated to something like
```java
String py4jDir = ZEPPELIN_HOME + "/interpreter/python";
String py4jFile = "py4j-{version}.zip"; // read directory py4jDir and get
file starts with py4j
setPythonCommand("docker run -i --rm -v " + py4jDir + ":/zeppelin_python -e
/zeppelin_python/" + py4jFile + " " + image + " python -iu");
```
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