Running parallel commands in multiple similar directories

rep

#!/usr/bin/env python
# Command Repeater
#
# For a directory tree like:
# 
#     MainProject/
#     ├── project-one
#     ├── project-two
#     ├── project-three
#     └── rep  # This script
#
# ... this script will run the same command in each subdirectory,
# as long as that subdirectory exists in the `project_dirs` variable below
# 
# For example:
# 
#     ./rep git status
# 
# ... will show, e.g.:
# 
#     ********************************
#     PROJECT: project-one
#     ********************************
# 
#     On branch master
#     nothing to commit, working directory clean
# 
# 
#     ********************************
#     PROJECT: project-two
#     ********************************
# 
#     On branch master
#     nothing to commit, working directory clean
# 
# 
#     ********************************
#     PROJECT: project-three
#     ********************************
#
#     On branch master
#     nothing to commit, working directory clean
#

import os
import sys
import subprocess

# Subdirectories
project_dirs = ['project-' + project for project in ['one', 'two', 'three]]

cwd = os.getcwd()

separator = '*' * 32 + '\n' + 'PROJECT: {}\n' + '*' * 32 + '\n'

for directory in project_dirs:
    os.chdir(os.path.join(cwd, directory))
    print(separator.format(directory))
    proc = subprocess.Popen(sys.argv[1:])
    returncode = proc.wait()
    os.chdir(cwd)
    print('\n')