随机生成验证码及python中的事务

1.随机生成验证码

# import random
# print(random.random())             #0-1的小数
# print(random.randint(1,3))         #包括1和3
# print("--",random.randrange(1,3))  #不包括1和3
 
#随机生成四位验证码
import random
checkcode = ''
for i in range(4):
    current = random.randrange(0,4)
    if current != i:
        temp = chr(random.randint(65,90))
    else:
        temp = random.randint(0,9)
    checkcode += str(temp)
print(checkcode)
    #KS3G
 
 
#随机生成8位验证码
import string
 
print(string.ascii_lowercase)
    #abcdefghijklmnopqrstuvwxyz
print(string.digits)
    #0123456789
 
obj = random.sample(string.ascii_lowercase+string.digits,8)
print(obj)
    #['i', 'm', 'o', '9', '6', 'p', 'g', '0']
row = "".join(random.sample(string.ascii_lowercase+string.digits,8))
print(row)
    #417x6kyt

a. 事例一:

try:
    from django.db import transaction
    with transaction.atomic():
        models.UpDown.objects.create(user_id=user_id,article_id=article_id,up=False)
        models.Article.objects.filter(nid=article_id).update(down_count=F('down_count')+1)
except Exception as e:
    response['status'] = False
    response['msg'] = str(e)

b. 事例二:

#函数里面有数据库操作,加在函数上
from django.db.transaction import atomic
 
@atomic
def cmd(self):
    model.....
    model.....