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中级

实现申请状态流转验证状态机

未完成
中级参考 代码结构已给出，请填写 ____ 处 
def solve():
    from pyodide.http import open_url
    loan_products_csv = open_url(____).read()
    clients_csv = open_url(____).read()
    loan_applications_csv = open_url(____).read()
    credit_assessments_csv = open_url(____).read()
    VALID_TRANSITIONS = {
        '____': ['____'],
        '____': ['____'],
        '____': ['____', '____'],
        '____': ['____'],
        '____': ['____'],
    }
    def validate_transition(____):
        return to_status in VALID_TRANSITIONS.get(____)
    tests = [(____), (____), (____)]
    for from_s, to_s in tests:
        valid = validate_transition(____)
        print(____)

示例

输入
solve()
期望输出
DRAFT -> SUBMITTED: VALID
PENDING_APPROVAL -> APPROVED: VALID
APPROVED -> REJECTED: INVALID
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