计算员工的活动时间

import time
from datetime import datetime

class TimeTracker:
    def __init__(self):
        self.activities = {}

    def start_activity(self, activity_name):
        if activity_name not in self.activities:
            self.activities[activity_name] = []
        self.activities[activity_name].append({'start': datetime.now()})

    def stop_activity(self, activity_name):
        if activity_name in self.activities and self.activities[activity_name]:
            self.activities[activity_name][-1]['end'] = datetime.now()

    def get_activity_duration(self, activity_name):
        total_duration = 0
        for entry in self.activities.get(activity_name, []):
            start = entry.get('start')
            end = entry.get('end')
            if start and end:
                total_duration += (end - start).total_seconds()
        return total_duration / 3600  # Convert seconds to hours

# 使用示例
tracker = TimeTracker()
tracker.start_activity('Coding')
time.sleep(2)  # 模拟工作时间
tracker.stop_activity('Coding')
print(f"Coding duration: {tracker.get_activity_duration('Coding')} hours")