计算a^2+b^2+c^2

'''
计算a^2+b^2+c^2
'''
def calc(*number):
    sum = 0
    for n in number:
        sum = sum + n * n
    return sum
print(calc(1,2,3))

'''
计算阶乘n!
'''

def jiecheng():
    num = int(input("请输入一个数字："))
    n = 1
    #查看数字是负数，0或正数
    if num < 0:
        print("负数没有阶乘")
    elif num == 0:
        print("0的阶乘是1")
    else:
        for i in range(1,num+1):
            n = n * i
        print("%d 的阶乘为%d" % (num,n))
print(jiecheng())

'''
把原字典的键值对颠倒并生产新的字典
'''
dict1={"A":"a","B":"b","C":"c"}
dict2={y:x for x,y in dict1.items()}
print(dict2)

'''
随机生成验证码的两种方式
'''
import random
list1 = []
for i in range(65,91):
    list1.append(chr(i))
    for j in range(97,123):
        list1.append(chr(j))
        for k in range(48,58):
            list1.append(chr(k))
ma = random.sample(list1,6)
print(ma)
ma = ''.join(ma)
print(ma)