定义求 n!的函数 fact()和求和函数 sum(),在此基础上编程实现 1!+2!+…m!的计算。
def fact(num):
result = 1
for i in range(1,num+1):
result *= i
return result
def sum(num):
result = 0
for i in range(1,num+1):
result = result + fact(i)
return result
num=eval(input("请输入一个数m:"))
print("1!+2!+...+{}!={}".format(num,sum(num)))
定义匿名函数实现求平方,定义判素数函数 list_prime(),该函数可以实现接受任意个数的判断,并将所有素数作为返回值。在此基础上编程实现随机输入任意个数,从中挑选出所有素数,并计算所有素数平方和。
def list_prime(num):
sum = 0
for i in range(1,num):
if (num % i==0):
sum +=1;
if sum>=2:
return 0
else:
return pingfang(num)
def pingfang(num):
return num*num;
str = eval(input("请随机输入任意个数(以逗号分割):"))
sum = 0
for i in str:
sum += list_prime(i)
print("你输入的数组中所有素数的平方和为:{}".format(sum))
分别定义 numlist()和 charlist()函数,numlist()功能是生成由数字 1-26 构成的列表,charlist()功能是生成由字符 A-Z 构成的列表。在此基础上编写程序实现
生成一个字典,具体如下:
{1: ‘a’, 2: ‘b’, 3: ‘c’, 4: ‘d’, 5: ‘e’, 6: ‘f’, 7: ‘g’, 8: ‘h’, 9: ‘i’, 10: ‘j’, 11: ‘k’, 12: ‘l’, 13: ‘m’,14: ‘n’, 15: ‘o’, 16: ‘p’, 17: ‘q’, 18: ‘r’, 19: ‘s’, 20: ‘t’, 21: ‘u’, 22: ‘v’, 23: ‘w’, 24: ‘x’, 25: ‘y’,26: ‘z’}
遍历字典,输出所有键值为偶数的元素。
def numlist():
num= []
for i in range(1,27):
num.append(i)
return num
def charlist():
char = []
for i in range(26):
char.append(chr(ord('A')+i))
return char
dictionary = dict(zip(numlist(),charlist()))
# print(dictionary)
for key in dictionary:
if key%2 ==0:
print(dictionary[key])
import turtle
def koch(size,n):
if n==0:
turtle.fd(size)
else:
for angle in [0,60,-120,60]:
turtle.left(angle)
koch(size/3,n-1)
def main():
turtle.setup(600,600)
turtle.speed(0)
turtle.penup()
turtle.goto(-200,100)
turtle.pendown()
turtle.pensize(2)
level = 5
koch(400,level)
turtle.right(120)
koch(400,level)
turtle.right(120)
koch(400,level)
turtle.hideturtle()
turtle.exitonclick()
main()