生成ansible-playbook的yaml文件的代码（字典排序问题无法解决）

import yaml

import collections

def add_task():

    return None

def add_vars():

    return None

def add_handles():

    return None

def add_project(name=None,gather_facts=False,hosts=None,remote_user=None,

                tasks=None,handlers=None,varstrings=None):

    aproject = collections.OrderedDict()

    aproject['name']=name

    aproject['hosts'] = hosts

    aproject['gather_facts'] = gather_facts

    aproject['remote_user'] = remote_user

    aproject['tasks'] = tasks

    aproject['handlers'] = handlers

    aproject['vars'] = varstrings

    for k,v in aproject.items():

        if v is None:

            aproject.pop(k)

    print aproject

    bprojects={}

    for key in aproject:

        print {key: aproject[key]}

    print bprojects

    f = open('test.yaml', 'w')

    result = yaml.dump(aproject, f, default_flow_style=False, allow_unicode=True)

    print result

if __name__=='__main__':

    tasks=add_task()

    handlers=add_handles()

    varstrings=add_vars()

    add_project(name='Silenthand Olleander',gather_facts=False,hosts=None,remote_user=None,

                tasks=tasks,handlers=handlers,varstrings=varstrings)