python

学生管理系统

# ===============================学生管理系统================================
students = []
# 1、显示学生管理系统菜单
def show_menu():
    """显示学生管理系统菜单"""
    print("--------------------------------------")
    print("|1. 添加学生信息")
    print("|2. 查询学生信息")
    print("|3. 查询学生总数")
    print("|4. 删除学生信息")
    print("|5. 修改学生信息")
    print("|6. 退出系统")
    print("--------------------------------------")

def add_student(name, age, grade, student_id =None):
    """添加"""
    if student_id is None:
        student_id = len(students) + 1001
    student = {
        "name":name,
        "age":age,
        "grade":grade,
        "id":student_id
    }
    students.append(student)
    print(f"成功添加学生:{name}(id:{student_id})")

def find_student(student_id):
    """查询"""
    for student in students:
        if student["id"] == student_id:
            return student
    return None

def count_student():
    """返回学生总数"""
    return len(students)

def add_demo_students():
    demo_stuents = [
        {"小明",18,25}
    ]
    for name,age,score in demo_stuents:
        add_student(name,age,score)


def getSelect(): 
   choice = input("请输入您的选择：")
   return choice

while True:
    show_menu()
    num = getSelect()
    if num == 1:
        # 添加学生信息
        name = input("输入学生姓名")
        add_student(name)
    elif num == 2:
        # 查询学生信息
        pass
    elif num == 6:
        # 退出系统
        print("谢谢使用本系统")
        break
    else:
        print("输入有误，重新输入1-6的数字")

递归函数 斐波那契数列

#-----------------递归函数------------------------
# 功能：n!
# 边界条件： n = 1, 结果为1
# 公式：n x (n - 1)!

def func(num):
    """n!"""
    #边界条件
    if num == 1:
        return 1
    # 公式
    else:
        return num * func(num-1)

num = int(input("输入整数："))
result = func(num)
print(f"{num}!=%d" % result)
# 斐波那契数列
# 边界条件：fib(0)=0 , fib(1) = 1
# 公式：fib(n) = fib(n-1) + fib(n-2)

def fib(n):
    if n == 0:
       return 0
    elif n == 1:
        return 1
    else:
       return fib(n-1)+fib(n-2)

n = int(input("输入整数："))
result = fib(n)
print(f"fib({n})=%d" % result)

#------------------匿名函数-----------------
# 实现简单功能，lambda<形式参数列表> : <表达式>
temp = lambda x : pow(x,2)   #定义
print(temp(10))