作业1

* 用条件语句写一个BMI（体重除以身高的平方）指数
* 　　低于18.5：过轻
* 　　18.5 - 25 正常
* 　　25 - 28 过重
* 　　28 - 32 肥胖
* 　　高于32 严重肥胖

weight = input("请输入体重：")
height = input("请输入身高：")
BMI = float(float(weight)/(float(height)**2))
#计算bmi的公式
if BMI<= 18.5:
    print("弱不禁风",BMI)
elif BMI<=25:
    print("继续保持",BMI)
elif BMI<=28:
    print("男生最喜欢的女孩的身材",BMI)
elif BMI<=32:
    print("wangjiale",BMI)
else:
    print("珍爱生命，控制食欲，多运动，多撩妹")

作业2：计算从1到100所有奇数的和

def odd1():
    sum = 0
    for i in range(0,101,2):
        # print(i)
        sum = sum + i
    print("从1到100所有奇数的和为:",sum)
if __name__ == '__main__':
    odd1()

def odd2():
    sum = 0
    for i in range(0,101):
        if i % 2 !=0:
            sum = sum+i
    print("从1到100所有奇数的和为:", sum)
if __name__ == '__main__':
    odd2()

作业3：计算从1到100所有偶数的和

def even1():
    sum = 0
    for i in range(1, 101, 2):
        # print(i)
        sum = sum + i
    print("从1到100所有偶数的和为:",sum)
if __name__ == '__main__':
    even1()

def even2():
    sum = 0
    for i in range(1,101):
        if i % 2 == 0:
            print(i)
            sum = sum + i
    print("从1到100所有偶数的和为:",sum)
if __name__ == '__main__':
    even2()

作业4：用while计算1到100的乘积

def Product():
    product = 1
    num = 1
    while num <= 100:
        product = num * product
        num = num + 1
    print("1到100的乘积",product)
if __name__ == '__main__':
    Product()

作业5：写一个用户登陆（三次重试机会）（input输入账号和密码）

def Login():
    i = 1
    while i <= 3:
        username = input("请输入账号：")
        password = input("请输入密码：")
        if username == 'wls'and password == '123456':
            print("欢迎登陆成功界面")
            break
        else:
            print("你的账号或密码错误")
            i = i + 1
if __name__ == '__main__':
    Login()

作业6：把一个整数转化为八进制、二进制、十六进制表示的字符串

num1 = 666
print(type(num1))
print(hex(num1))#十六进制
print(type(hex(num1)))
print(oct(num1))#八进制
print(type(oct(num1)))
print(bin(num1))#二进制
print(type(bin(num1)))
print(format(num1,'b'))

作业7：利用math写一个返回多值的函数，并且能够打印出来

import math
def moving(x,y,step,angle=0):
    nx = x + step*math.cos(angle)
    ny = y + step * math.sin(angle)
    return nx  ,  ny
if __name__ == '__main__':
    x,y  = moving(20,20,50,111)
    print(x,y)
    r = moving(20,20,50,111)
    print(type(r))

作业8：定义一个函数sam(a,b,c),接收3个参数，返回一元二次方程

a = 2
print(isinstance(a,int))
print(isinstance(a,str))
print(isinstance(a,(str,int,list,tuple)))
import math
def sam(a,b,c):
    if not (isinstance(a,(int,float)))and(isinstance(b,(int,float)))and(isinstance(c,(int,float))):
        raise TypeError("a,b,c不全是数字")
    # if not isinstance(a,(int,float)):
    #     raise TypeError("a不是一个数字")
    # if not isinstance(b,(int,float)):
    #     raise TypeError("a不是一个数字")
    # if not isinstance(c,(int,float)):
    #     raise TypeError("a不是一个数字")
    if a == 0:
        return '请输入不为0的值'
    else:
        d = b*b - 4*a*c
        if d < 0:
            return '无解'
        elif d == 0:
            x = -b/(2*a)
        else:
            x1 = (-b+math.sqrt(d))/(2*a)
            x2 = (-b-math.sqrt(d))/(2*a)
            return x1,x2
if __name__ == '__main__':
    a = float(input