Github user nchammas commented on the issue:
https://github.com/apache/spark/pull/15659
I tested this out with Python 3 on my system with the following commands:
```
# Inside ./spark/.
python3 -m venv venv
source venv/bin/activate
./dev/make-distribution.sh --pip
pip install -e ./python/
which pyspark
pyspark
```
Seems there is a bug with how `SPARK_HOME` is computed:
```
[make-distribution.sh output snipped]
$ pip install -e ./python/
Obtaining file:///.../apache/spark/python
Collecting py4j==0.10.4 (from pyspark==2.1.0.dev1)
Downloading py4j-0.10.4-py2.py3-none-any.whl (186kB)
100%
|ââââââââââââââââââââââââââââââââ|
194kB 2.0MB/s
Installing collected packages: py4j, pyspark
Running setup.py develop for pyspark
Successfully installed py4j-0.10.4 pyspark
$ which pyspark
.../apache/spark/venv/bin/pyspark
$ pyspark
Could not find valid SPARK_HOME while searching <map object at 0x102bc15f8>
.../apache/spark/venv/bin/pyspark: line 24: None/bin/load-spark-env.sh: No
such file or directory
.../apache/spark/venv/bin/pyspark: line 77:
.../apache/spark/None/bin/spark-submit: No such file or directory
```
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