python代码： 问题单管理系统

以下是一个简单的问题单管理系统的 Python 代码示例，包括问题单的创建、分配、解决和关闭等基本功能：

# 定义问题单类
class Issue:
    def __init__(self, id, title, description, reporter):
        self.id = id
        self.title = title
        self.description = description
        self.reporter = reporter
        self.assignee = None
        self.status = 'Open'
    
    def assign(self, assignee):
        self.assignee = assignee
        self.status = 'Assigned'
    
    def resolve(self):
        self.status = 'Resolved'
    
    def close(self):
        self.status = 'Closed'

# 定义问题单管理系统类
class IssueTracker:
    def __init__(self):
        self.issues = []
        self.next_id = 1
    
    def create_issue(self, title, description, reporter):
        issue = Issue(self.next_id, title, description, reporter)
        self.issues.append(issue)
        self.next_id += 1
        return issue
    
    def get_issue(self, id):
        for issue in self.issues:
            if issue.id == id:
                return issue
        return None
    
    def assign_issue(self, id, assignee):
        issue = self.get_issue(id)
        if issue is not None and issue.status == 'Open':
            issue.assign(assignee)
            return True
        else:
            return False
    
    def resolve_issue(self, id):
        issue = self.get_issue(id)
        if issue is not None and issue.status == 'Assigned':
            issue.resolve()
            return True
        else:
            return False
    
    def close_issue(self, id):
        issue = self.get_issue(id)
        if issue is not None and issue.status == 'Resolved':
            issue.close()
            return True
        else:
            return False

# 测试代码
tracker = IssueTracker()
issue1 = tracker.create_issue('Bug 1', 'This is a bug', 'Alice')
issue2 = tracker.create_issue('Feature 1', 'This is a feature request', 'Bob')
print(issue1.id, issue1.title, issue1.status)
print(issue2.id, issue2.title, issue2.status)
tracker.assign_issue(issue1.id, 'Charlie')
print(issue1.id, issue1.title, issue1.status, issue1.assignee)
tracker.resolve_issue(issue1.id)
print(issue1.id, issue1.title, issue1.status)
tracker.close_issue(issue1.id)
print(issue1.id, issue1.title, issue1.status)

在上面的代码中，`Issue` 类表示一个问题单，包括问题单的编号、标题、描述、报告人、受理人和状态等信息，`IssueTracker` 类表示一个问题单管理系统，包括创建问题单、获取问题单、分配问题单、解决问题单和关闭问题单等基本功能。你可以根据实际需求进行扩展和修改。