kube_config_merger.py

#!/usr/bin/env python3
# usage:
# python kube_config_merge.py ~/.kube/config1 ~/.kube/config2 

import sys
import yaml  # PyYAML

configs = []
for config in sys.argv[1:]:
    print(config)
    configs.append(yaml.load(open(config, 'r')))

# load first config
merged = configs[0]

# merge next configs with the first one
for config in configs[1:]:
    for cluster in config['clusters']:
        merged['clusters'].append(cluster)
    for context in config['contexts']:
        merged['contexts'].append(context)
    for user in config['users']:
        merged['users'].append(user)

print(yaml.dump(merged, default_flow_style=False))