day7

day7

1.把字符串中的所有数字去掉

s = "a1b2c3b4d5dddddd"

def move_num(s):

result = ''

for i in s:

if i not in '1234567890':

result += i

return result

方法2：print(''.join([v for v in s if v.isapha()]))

利用isappha()方法判断字符串是否是字母，如果是字母返回true

方法3：print(''.join(filter(lambda x: x not in '1234567890',s)))

 

2.三个数排序

def sort(a,b,c):

if a>b:

a,b = b,a

if a>c:

a,c = c,a

if b>c:

b,c = c,b

print(a,b,c)

return a,b,c

 

3.求一个列表中最大的值

方法1：冒泡排序，返回最后一个值

def sort(s):

for i in range(len(s)):

for m in range(i+1):

if s[i] < s[m]:

s[i],s[m] = s[m],[i]

return s[-1]

方法2：逐个比较,拿第一个值当做基数，如果后面有值大于基数，就改变基数

def max(s):

max_num = s[0]

for i in s:

if i >max_num:

max_num = i

return max_num

 

4.生成9位数字的密码

import random

password = ''

for i in range(9):

password += str(random.randint(0,9))

 

5.生成9位字母的密码

import string,random

password = ''

for i in range(9):

password += random.choice(string.ascii_letters)

 

6.生成9位数字和字母的密码

import string,random

data_list = []

list1 = list(string.ascii_letters)

list2 = [v for v in range(0,10)]

list1.extend(list2)

for i in range(9):

password = random.choice(list1)