day13

day13

1.使用 while,计算随机数之和，超过 100 的时候，停

止程序。随机数 1-20 的范围产生，要求记录一下产生的随

机数，以及最后的和，以及随机数的个数

>>> import random

>>> count = 0

>>> num = []

>>> num_add = 0

>>> while True:

... n = random.randint(1,20)

... num_add += n

... if num_add > 100:

... print(num_add)

... break

... num.append(n)

... print(n)

count = len(num)

方法2：

import random

count = 0

result = []

while count <= 100:

n = random.randint(1,20)

count += n

result.appen(n)

 

2.遍历字符串、列表，分别基于位置和和基于字符遍历

遍历字符：s = 'adfsad'

for i in range(len(s)):

print(s[i])

for i in s:

print(i)

遍历列表：l = [1,2,3,4,5]

for i in l:

print(i)

for i in range(len(l)):print(l[i])

 

3.遍历一个列表中的嵌套列表和元组的所有元素,将

1-12 的数字进行输出！[[[1,2,3],4,5],7,8,(9,10,(11,12))]

注：次解法只针对这个题，能不能自己判断并循环输出？

list1 = [[[1,2,3],4,5],7,8,(9,10,(11,12))]

>>> for i in range(len(s)):

... if isinstance(s[i],list):

... for k in range(len(s[i])):

... print(s[i][k])

... if isinstance(s[i][k],list):

... for m in s[i][k]:

... print(m)

print(s[i][k])

... elif isinstance(s[i],tuple):

... print(s[i])

... for n in s[i]:

... print(n)

if isinstance(s[i][n],tuple):

for b in s[i][n]:

print(b)

print(s[i][n])

... else:

... print(s[i])

 

4.判断一个数是不是素数

math.sqrt() # 平方根

import math

def is_prime(num):

if num == 0:

return Flase

elif num == 1:

return Flase

elif num == 2:

return True

else:

for i in range(2,int(math.sqrt(num))+1):

if num % i == 0:

return Flase

return True

 

5.求100以内的素数之和

result = 0

for i in range(100):

if is_prime(i):

result += i

print(result)