Given a linked list, determine if it has a cycle in it.
To represent a cycle in the given linked list, we use an integer pos which represents the position (0-indexed) in the linked l...
如 判断str是否包含str_list中的元素
str = "this is string example....wow!!!"
str_list = ['aa','bb','str','ex']
flag = all( i in str for i in str_list) #用any(),或者all()函数判断是否包含,返回值为...
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
public class Test {
public static void main(String[] args) {
People p1 = new People("b", "b");
...
原文:SqlServer判断数据库、表、字段、存储过程、函数是否存在
判断数据库是否存在
if exists (select * from sys.databases where name = '数据库名')
--drop database [数据库名]
判断表是否存在
if exists (s...
1.BBS项目之注册功能通过forms验证
from django import forms
from blog.models import User
from django.contrib.auth import authenticate
class CheckForm(forms.Form):
username = forms.CharField(max_...