h5py not playing nicely with subprocess and mpirun

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-01-24.18:21:59.774>
labels = ['3.7', 'type-bug', 'library']
title = 'h5py not playing nicely with subprocess and mpirun'
updated_at = <Date 2020-01-24.18:21:59.774>
user = 'https://bugs.python.org/RafaelLaboissire'

bugs.python.org fields:

activity = <Date 2020-01-24.18:21:59.774>
actor = 'Rafael Laboissi\xc3\xa8re'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2020-01-24.18:21:59.774>
creator = 'Rafael Laboissi\xc3\xa8re'
dependencies = []
files = []
hgrepos = []
issue_num = 39445
keywords = []
message_count = 1.0
messages = ['360638']
nosy_count = 1.0
nosy_names = ['Rafael Laboissi\xc3\xa8re']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue39445'
versions = ['Python 3.7']