### What is this PR for?
After #1534 , Dynamic Forms were no longer working in the python interpreter. This is because the `Py4jZeppelinContext` constructor did not initialize the `_displayhook` which is always called on post-execute.
### What type of PR is it?
Bug Fix
### What is the Jira issue?
[ZEPPELIN-1655](https://issues.apache.org/jira/browse/ZEPPELIN-1655)
### How should this be tested?
Run the following `%python` paragraph, being sure that Py4j is installed:
```python
%python
a, b, c = (1, 2, 3)
z.select("Choose a letter", ([a,"a"], [b,"b"], [c,"c"] ))
```
### Questions:
* Does the licenses files need update? No
* Is there breaking changes for older versions? No
* Does this needs documentation? No
Author: Alex Goodman <agoodm@users.noreply.github.com>
Closes#1626 from agoodm/ZEPPELIN-1655 and squashes the following commits:
2e4ee2d [Alex Goodman] Make sure _displayhook is initialized in Py4jZeppelinContext
### What is this PR for?
Small refactoring of Python interpreter, that is what it is.
### What type of PR is it?
Refactoring
### Todos
* [x] refactor `help()`
* [x] impl `maxResult` fetch from JVM
### How should this be tested?
`cd python && mvn -Dpython.test.exclude='' test ` pass (given that `pip install pandasql` and `pip install py4j`)
### Questions:
* Does the licenses files need update? No
* Is there breaking changes for older versions? No
* Does this needs documentation? No
Author: Alexander Bezzubov <bzz@apache.org>
Closes#1275 from bzz/python/refactoring and squashes the following commits:
15a35c8 [Alexander Bezzubov] Make .help() method a single string literal
e800fd7 [Alexander Bezzubov] Make Python fetch maxResults from JVM
### What is this PR for?
Display Pandas DataFrame using Zeppelin's Table Display system.
### What type of PR is it?
Feature
### Todos
* [x] fix NPE in logs on empty paragraph execution
* [x] matplotlib: refactor `zeppelin_show(plt)` -> `z.show(plt)`
* [x] pandas: support `z.show(df)`
* [x] update docs
### What is the Jira issue?
[ZEPPELIN-1048](https://issues.apache.org/jira/browse/ZEPPELIN-1048)
### How should this be tested?
"Zeppelin Tutorial: Python - matplotlib basic" should work, and
```python
import pandas as pd
rates = pd.read_csv("bank.csv", sep=";")
z.show(rates)
```
### Screenshots (if appropriate)
### Questions:
* Does the licenses files need update? No
* Is there breaking changes for older versions? No
* Does this needs documentation? Yes
Author: Alexander Bezzubov <bzz@apache.org>
Closes#1067 from bzz/python/pandas-support and squashes the following commits:
3b1ad36 [Alexander Bezzubov] Python: update docs to reffer new API
ee6668b [Alexander Bezzubov] Python: update docs, add Pandas integration
71be418 [Alexander Bezzubov] Python: limit 1000 for table display system on DataFrame
52e787d [Alexander Bezzubov] Python: pandas DataFrame using Table display system
bc91b86 [Alexander Bezzubov] Python: skip interpreting empty paragraphs
a7248cd [Alexander Bezzubov] Python: draft of pandas support
15646a1 [Alexander Bezzubov] Python: refactoring to z.show()
### What is this PR for?
This is first step improving current Python interpreter implementation.
It has just a cleanup, style and docs improvements.
### What type of PR is it?
Improvement
### Questions:
* Does the licenses files need update? No
* Is there breaking changes for older versions? No
* Does this needs documentation? No
Author: Alexander Bezzubov <bzz@apache.org>
Closes#1021 from bzz/improve/python and squashes the following commits:
3cafa22 [Alexander Bezzubov] Python: make interpreter logs less verbose
744f7d2 [Alexander Bezzubov] Python: move technical details from doc to README.md
0f74e5d [Alexander Bezzubov] Python: return first running job
08c2bb4 [Alexander Bezzubov] Python: upd Java code to conform project conventions
e84cd5c [Alexander Bezzubov] Python: normalize newlines in python
58efcc9 [Alexander Bezzubov] Python: normalize newlines in Java
### What is this PR for?
Adding a python 2 &3 interpreter. It's a basic implementation (no py4j for example), with a java ProcessBuilder object used to instantiate a python REPL.
The interpreter doesn't bring it own python binary but uses the python specified by python.path configutation. Thus, you can still use your specific installed python modules (scikit-learn, matplotlib...) and the interpreter is able to work with python 2 & 3 without change.
I had a python helper function (zeppelin_show() ) to easily display matplotlib graph as SVG.
### What type of PR is it?
[Feature]
### Todos
* [x] - Code review
* [x] - Improve bootstrap.py : choose available helper functions and their names
* [x] - Unit / IT tests ?
* [x] documentation updates needed, that AhyoungRyu pointed out
* [X] LICENSE needs to be updated to include all non-apache licensed dependencies (i.e AFAIK Py4j is BSD ) in bin-license
* [x] double-check that code formatting conforms project style guide
* [x] the branch need to be rebased on latest master.
### What is the Jira issue?
[ZEPPELIN-502](https://issues.apache.org/jira/browse/ZEPPELIN-502?jql=project%20%3D%20ZEPPELIN%20AND%20text%20~%20%22python%22)
### How should this be tested?
1. In interpreter screen, in Python section, specify in python.path the python binary you want to use
2. In a paragraph, you can use the interpreter with **_%python_**. Calling help() will describe you the interpreter functionnalities.
3. Install py4j (pip install py4j) if you want to use input form
### Screenshots
### Questions:
* Does the licenses files need update? Yes, only bin-license (py4j)
* Is there breaking changes for older versions? No
* Does this needs documentation? Yes
Author: Hervé RIVIERE <hriviere@users.noreply.github.com>
Closes#869 from hriviere/PR_interpreter_python and squashes the following commits:
80b6e75 [Hervé RIVIERE] [ZEPPELIN-502] move BSD py4j license to zeppelin-distribution/src/bin_license/license
a4b82a5 [Hervé RIVIERE] [ZEPPELIN-502]Improving doc following @AhyoungRyu review
3252353 [Hervé RIVIERE] [ZEPPELIN-502] Formatting code to respect project convention
54ec4f1 [Hervé RIVIERE] [ZEPPELIN-502]Improving doc following @AhyoungRyu review
6a831bc [Hervé RIVIERE] [ZEPPELIN-502] Add BSD py4j license
11e1b9c [Hervé RIVIERE] [ZEPPELIN-502] minor changes in python.md
e5d0bdb [Hervé RIVIERE] [ZEPPELIN-502] change PYTHON_PATH to ZEPPELIN_PYTHON
c62ac98 [Hervé RIVIERE] [ZEPPELIN-502] Improve python.md
5008125 [Hervé RIVIERE] [ZEPPELIN-502] Improve python.md with features not yet supported and technical description
7d533e1 [Hervé RIVIERE] [ZEPPELIN-502] Add tests and reformating code to help tests writing
fecaf25 [Hervé RIVIERE] [ZEPPELIN-502] Rename python.path to python and default from /usr/bin/python to python
02d1320 [Hervé RIVIERE] [ZEPPELIN-502] Input form, change from simple input form to native (pyspark syntax)
60d2956 [Hervé RIVIERE] [ZEPPELIN-502] Indent as pep8 convention
9bdb192 [Hervé RIVIERE] [ZEPPELIN-502] Add python.md to _navigation.html
7142aa5 [Hervé RIVIERE] [ZEPPELIN-502] Catch exception in logger.error
1a86ad7 [Hervé RIVIERE] [ZEPPELIN-502] Python interpreter group
