Python题目:学生信息管理系统

Python题目:学生信息管理系统

       选用list、tuple、dictionary或map等数据结构,存储X个学生的三门课的成绩(机器学习、Python程序设计、研究生英语),并实现以下功能:

  • 1.添加学生信息
  • 2.修改学生信息
  • 3.删除学生
  • 4.添加学生的成绩
  • 5.修改学生成绩
  • 6.按姓名或者学号查找学生,显示学生信息及三门课的成绩,以及排名
  • 7.学生成绩统计(每门课的平均分、最高分、最低分)

现在把另一个高级版也放出来了,拥有图像界面显示,MySQL数据库操作:https://blog.csdn.net/kdongyi/article/details/103170876 -2019/11/20


stu_number = {
	"182085211002":"张三",
	"182085211003":"a",
	"182085211004":"b",
	"182085211005":"a",
	"182085211006":"d",
	"182085211007":"张三",
	"182085211008":"f",
}

stu_info = [
	["182085211002","张三","男","汉族","100","99","98"],
	["182085211003","a","男","汉族","60","99","98"],
	["182085211004","b","男","汉族","100","88","98"],
	["182085211005","a","男","汉族","100","99","45"],
	["182085211006","d","男","汉族","100","75","98"],
	["182085211007","张三","男","汉族","100","75","98"],
	["182085211008","f","男","汉族","50","60","60"],
]

rank = {}


# 添加学生信息
def add_stu(stu_id):
	stu = []

	if stu_id in stu_number.keys():  # 判断'stu_num'是否存在于stu_number的键中
		print('该学生已存在,请勿重复添加!')
	else:
		stu_name = input("请输入学生姓名:")
		stu_number[stu_id] = stu_name
		stu.append(stu_id)
		stu.append(stu_name)
		stu.append(input("请输入学生性别:"))
		stu.append(input("请输入学生民族:"))
		stu.append("无")
		stu.append("无")
		stu.append("无")
		stu_info.append(stu)

		print_stu(stu_id)

# 修改学生信息
def modif_stu(stu):
	if stu in stu_number.keys():  # 判断'stu_num'是否存在于stu_number的键中
		print_stu(stu)
		print("该学生信息如上,请输入要修改的项目:")
		while True:
			cmd = input("1、姓名  2、性别  3、民族 (输入q返回上级菜单):")
			if cmd == 'q':
				break
			elif cmd == '1':
				index = find_stu(stu)
				for i in index:
					stu_info[i][1] = input("请输入修改后的姓名:")
			elif cmd == '2':
				index = find_stu(stu)
				for i in index:
					stu_info[i][2] = input("请输入修改后的性别:")
			elif cmd == '3':
				index = find_stu(stu)
				for i in index:
					stu_info[i][3] = input("请输入修改后的民族:")
			print("修改后的信息如下:")
			print_stu(stu)

	else:
		print('该学生不存在,请添加或重新输入!')

# 删除学生
def delete_stu(stu):
	if stu in stu_number.keys():  # 判断'stu_num'是否存在于stu_number的键中
		print_stu(stu)
		cmd = input("该学生信息如上,确定是否删除?(Y/N):")
		if cmd == 'Y':
			index = find_stu(stu)
			for i in index:
				del stu_info[i]
				print("该学生已删除!")
	else:
		print('该学生不存在,请添加或重新输入!')


# 添加学生成绩
def add_stu_val(stu_id):
	if stu_id in stu_number.keys():  # 判断'stu_num'是否存在于stu_number的键中
		print_stu(stu_id)
		print("该学生信息如上")

		index = find_stu(stu_id)
		for i in index:
			stu_info[i][4] = input("请输入机器学习成绩:")
			stu_info[i][5] = input("请输入Python程序设计成绩:")
			stu_info[i][6] = input("请输入研究生英语:")
		print("添加成绩结果如下:")
		print_stu(stu)
	else:
		print('该学生不存在,请添加或重新输入!')


# 修改学生成绩
def modif_stu_val(stu):
	if stu in stu_number.keys():  # 判断'stu_num'是否存在于stu_number的键中
		print_stu(stu)
		print("该学生信息如上,请输入要修改的课程:")
		while True:
			cmd = input("1、机器学习  2、Python程序设计  3、研究生英语 (输入q返回上级菜单):")
			if cmd == 'q':
				break
			elif cmd == '1':
				index = find_stu(stu)
				for i in index:
					stu_info[i][4] = input("请输入修改后的成绩:")
			elif cmd == '2':
				index = find_stu(stu)
				for i in index:
					stu_info[i][5] = input("请输入修改后的成绩:")
			elif cmd == '3':
				index = find_stu(stu)
				for i in index:
					stu_info[i][6] = input("请输入修改后的成绩:")
			print("修改后的信息如下:")
			print_stu(stu)

	else:
		print('该学生不存在,请添加或重新输入!')


# 排名
def ranking():
	to_rank = {}
	for stu in stu_info:
		if stu[4]=='无' or stu[5]=='无' or stu[6]=='无':
			to_rank[stu[0]] = 0
			rank[stu[0]] = '无'
		else:
			to_rank[stu[0]] = (int(stu[4])+int(stu[5])+int(stu[6]))/3
			ranked = sorted(to_rank.items(),key = lambda x:x[1],reverse = True)
			num = 1
			re_num = 0 #分一样
			for i in range(len(ranked)):
				if i!=0:
					if ranked[i][1]==ranked[i-1][1]: #考虑分数一样的情况 排名相同
						re_num+=1
						rank[ranked[i][0]] = num
					else:
						num = num + 1 + re_num #分数不一样 排名加一 如果有重复排名则加上
						rank[ranked[i][0]] = (num + re_num)
						re_num = 0
				else: #存第一名
					rank[ranked[i][0]] = num

# 按姓名或者学号查找学生,返回值为列表 列表里的值为该学生数据位置
# 如果有重名学生,则返回在列表返回多个学生
def find_stu(stu):
	stu_index = []
	for i in stu_info:
		try:
			if i.index(stu) != None: #如果能查找到
				stu_index.append(stu_info.index(i))
		except:pass
	return stu_index

# 根据姓名或者学号显示学生信息及三门课的成绩、排名
def print_stu(stu):
	ranking()  # 排名
	stu_index = find_stu(stu)
	if len(stu_index) == 0:
		print("无此学生,请核对后重新输入!")
	for i in stu_index:
		the_stu = stu_info[i]
		print("\t姓名:",the_stu[1])
		print("\t学号:", the_stu[0])
		print("\t性别:", the_stu[2])
		print("\t民族:", the_stu[3])
		print("\t机器学习成绩:", the_stu[4])
		print("\tPython程序设计成绩:", the_stu[5])
		print("\t研究生英语成绩::", the_stu[6])
		print("\t排名::", rank[the_stu[0]])
		print("--------------------------")

def statistics():
	machine_learning_max = 0
	python_max = 0
	english_max = 0
	machine_learning_min = 100
	python_min = 100
	english_min = 100
	machine_learning = 0
	python = 0
	english = 0
	num = 0

	for stu in stu_info:
		if stu[4]!='无' and stu[5]!='无' and stu[6]!='无':
			num += 1
			machine_learning += float(stu[4])
			python += float(stu[5])
			english += float(stu[6])

			if float(stu[4]) > machine_learning_max: machine_learning_max = float(stu[4])
			if float(stu[4]) < machine_learning_min: machine_learning_min = float(stu[4])
			if float(stu[5]) > python_max: python_max = float(stu[5])
			if float(stu[5]) < python_min: python_min = float(stu[5])
			if float(stu[6]) > english_max: english_max = float(stu[6])
			if float(stu[6]) < english_min: english_min = float(stu[6])

	machine_learning = machine_learning/num
	python = python/num
	english = english/num

	print("学生成绩统计如下:")
	print("机器学习:")
	print("\t平均分:%.2f,最高分:%.2f,最低分:%.2f" % (machine_learning,machine_learning_max,machine_learning_min))
	print("Python程序设计:")
	print("\t平均分:%.2f,最高分:%.2f,最低分:%.2f" % (python, python_max, python_min))
	print("研究生英语:")
	print("\t平均分:%.2f,最高分:%.2f,最低分:%.2f" % (english, english_max, english_min))


while True:
	print("--------------------------")
	print("请输入以下命令进行操作:")
	print("\t1 添加学生信息")
	print("\t2 修改学生信息")
	print("\t3 删除学生")
	print("\t4 添加学生的成绩")
	print("\t5 修改学生成绩")
	print("\t6 按姓名或者学号查找学生,显示学生信息及三门课的成绩,以及排名")
	print("\t7 学生成绩统计")
	print("\texit 退出系统!")
	cmd = input("请输入命令:")

	if cmd == 'exit': # 退出系统!
		break
	elif cmd == '1': # 添加学生信息
		print("--------------------------")
		while True:
			stu_id = input("请输入要添加学号(输入q返回上级菜单):")
			if stu_id == 'q':
				break
			add_stu(stu_id)

	elif cmd == '2': # 修改学生信息
		print("--------------------------")
		while True:
			stu = input("请输入要修改的学生学号(输入q返回上级菜单):")
			if stu == 'q':
				break
			modif_stu(stu)

	elif cmd == '3': # 删除学生
		print("--------------------------")
		while True:
			stu = input("请输入要删除的学生学号(输入q返回上级菜单):")
			if stu == 'q':
				break
			delete_stu(stu)

	elif cmd == '4': # 添加学生的成绩
		print("--------------------------")
		while True:
			stu = input("请输入要添加成绩的学号(输入q返回上级菜单):")
			if stu == 'q':
				break
			add_stu_val(stu)

	elif cmd == '5': # 修改学生成绩
		print("--------------------------")
		while True:
			stu = input("请输入要修改成绩的学号(输入q返回上级菜单):")
			if stu == 'q':
				break
			modif_stu_val(stu)

	elif cmd == '6': # 按姓名或者学号查找学生,显示学生信息及三门课的成绩,以及排名
		ranking() # 排名
		print("--------------------------")
		while True:
			stu = input("请输入要查询的学生姓名或学号(输入q返回上级菜单):")
			if stu == 'q':
				break
			print_stu(stu)

	elif cmd == '7': # 学生成绩统计
		print("--------------------------")
		statistics()

 

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