为什么工厂女孩上错了课？

class CourseScheduler:
    def __init__(self):
        self.schedule = {}

    def add_course(self, student, course):
        if student in self.schedule:
            raise ValueError(f"{student} already has a course scheduled.")
        self.schedule[student] = course

    def get_course(self, student):
        return self.schedule.get(student, "No course scheduled.")

# 错误示例
scheduler = CourseScheduler()
scheduler.add_course("FactoryGirl", "Math")  # 假设这里应该添加的是"Science"
print(scheduler.get_course("FactoryGirl"))  # 输出: Math，而不是预期的Science

# 解决方法：检查并修正添加课程的逻辑
scheduler.add_course("FactoryGirl", "Science")
print(scheduler.get_course("FactoryGirl"))  # 现在输出: Science