convert environment.yml to requirement.txt

env2req.py

import yaml
with open("environment.yaml") as f:
    environment_list = yaml.safe_load(f)

requirements = []
for dep in environment_list['dependencies']:
    if isinstance(dep, str):
        package, package_version = dep.split('=')
        if package_version == '0':
            continue
        requirements.append(package + '==' + package_version)
    elif isinstance(dep, dict):
        for preq in dep.get('pip', []):
            requirements.append(preq)

with open('requirements.txt', 'w') as fp:
    for requirement in requirements:
       print(requirement, file=fp)