我不能在类中使用这些指针变量在文件上写数据.程序中没有错误,但文件上没有写入数据.请有人告诉我,我做错了什么.
#include <iostream.h>
#include <fstream.h>
class studentinfo
{
private:/*Creating Private Data Members */
char* VUID;
char* campusID;
char* Studentname;
char* Fathername;
public:
void Storefile();/* Function to Store Data in the File*/
char Display();/*Function to Read and then Display Data from the File*/
studentinfo(char*, char*, char*, char*);/*Constructor to initialize Data Members*/
~studentinfo();
};
/* Constructor Defined Here*/
studentinfo::studentinfo(char* VUID, char* campusID, char* Studentname, char* Fathername)
{
cout << "Parameterized Contructor is Called" << endl << endl;
}
/*Destructor Defined Here*/
studentinfo::~studentinfo() …我可以在start_urls中使用变量吗？请看下面的脚本:
这个脚本工作正常:
from scrapy.spider import Spider
from scrapy.selector import Selector
from example.items import ExampleItem
class ExampleSpider(Spider):
name = "example"
allowed_domains = ["example.com"]
start_urls = [
"http://www.example.com/search-keywords=['0750692995']",
"http://www.example.com/search-keywords=['0205343929']",
"http://www.example.com/search-keywords=['0874367379']",
]
def parse(self, response):
hxs = Selector(response)
item = ExampleItem()
item['url'] = response.url
item['price'] = hxs.select("//li[@class='mpbold']/a/text()").extract()
item['title'] = hxs.select("//span[@class='title L']/text()").extract()
return item
但我想这样:
from scrapy.spider import Spider
from scrapy.selector import Selector
from example.items import ExampleItem
class ExampleSpider(Spider):
name = "example"
allowed_domains = ["example.com"]
pro_id = ["0750692995", "0205343929", "0874367379"] ***(I added this line) …from scrapy.spider import BaseSpider
from scrapy.selector import HtmlXPathSelector
from manga.items import MangaItem
class MangaHere(BaseSpider):
name = "mangah"
allowed_domains = ["mangahere.com"]
start_urls = ["http://www.mangahere.com/seinen/"]
def parse(self,response):
hxs = HtmlXPathSelector(response)
sites = hxs.select('//ul/li/div')
items = []
for site in sites:
rating = site.select("p/span/text()").extract()
if rating > 4.5:
item = MangaItem()
item["title"] = site.select("div/a/text()").extract()
item["desc"] = site.select("p[2]/text()").extract()
item["link"] = site.select("div/a/@href").extract()
item["rate"] = site.select("p/span/text()").extract()
items.append(item)
return items
我的目标是抓取www.mangahere.com/seinen或该网站上的任何内容.我想浏览每一页并收集大于4.5评级的书籍.我最初是作为一个basespider,并尝试复制和阅读scrapy教程,但它几乎是我的头脑.我在这里问我该怎么做才能创建我的规则,以及如何制定规则.我也似乎无法让我的条件工作,代码要么只返回第一个项目并停止,无论条件如何,或抓住所有内容,无论条件如何.我知道它可能是相当混乱的代码,但我仍然在努力学习.随意修改代码或提供其他建议
我的目的是从1到9生成随机数而不重复
#include<iostream>
#include<ctime>
#include<cstdlib>
using namespace std;
int randrange(int low,int high) /* generates a random number within given range*/
{
return rand()%(low+high)+low+1;
}
int main()
{
int num[9]={0},i,j;
bool check;
for(i=0;i<9;i++)
{
check=false;
do
{
num[i]=randrange(1,9);
for(j=0;j<i;j++)
{
if( num[i]==num[j]) // checks whether number already exists in the array
check=false;
else
check=true;
}
} while(check==false);
}
// the program is working fine without the repetition check
// this section prints out the array elements
for(i=0;i<9;i++)
{
cout<<num[i]<<" ";
}
return …
我用递归规则做了一个蜘蛛,按照下一页的链接.它工作正常.
蜘蛛抓取所有页面(999),但"start_urls"中定义的第一页除外.有人遇到过这个问题吗？
示例代码:
class example(CrawlSpider):
name = "example"
allowed_domains = ["example.ndd"]
start_urls = ["http://example.ndd/startnum=1"] #first page
rules = (Rule(SgmlLinkExtractor(allow=("nextPage\.htm", ),
restrict_xpaths=('//div[@class="paging"]/p[@class="nav"]',)),
callback="parse_items", follow= True),)
def parse_items(self, response):
hxs = HtmlXPathSelector(response)
links= hxs.select('//td[@class="desc"]/h3/a/@href').extract()
list = []
for link in links:
yield link
return
编辑:搜索后,爬虫看到直接跟随规则的限制路径的结果.同样如果从startnum = 1开始,它抓取startnum = 11,这是在startnum = 1的页面内..
我不知道如何解决这个问题.
大家好,请有人帮我修一下这个代码吗？它运行但它不执行它应该执行的任务.运行后,它会自动跳转到默认语句并跳过案例.请帮我解决这个问题!
#include<iostream.h>
#include<conio.h>
using namespace std;
int main()
{
int choice;
char nbaPlayer, tele, food, subject, x;
cout << "This program determines your favorites.\n\n";
cout << "Please select the number of your corresponding choice.";
cout << "\n1. NBA Player";
cout << "\n2. Teleserye";
cout << "\n3. Food";
cout << "\n4. Subject";
cout << "\n5. Exit";
switch (choice)
{
case 1:
cout << "You have chosen NBA Player.\n";
cout << "Please enter your favorite NBA Player. \n";
cin >> nbaPlayer;
cout …所以我正在制作一个程序来创建portmanteaus.我有我需要的代码和功能,我把它们放在一起.
这是代码:
def portmanteauscore(start, mid, end):
totallen = len(start) + len(mid) + len(end)
return totallen - abs((len(start)/totallen) - len(start)) - abs((len(mid)/totallen) - len(mid)) - abs((len(end)/totallen) - len(end))
def portmanteaugenerator(word1, word2, words):
mid = longest_common_substring(word1, word2)
start = word1[:word1.index(mid)]
end = word2[len(mid):]
if start + mid in words and mid + end in words:
return start, mid, end
def natalie(words):
"Find the best Portmanteau word formed from any two of the list of words."
wordpermutations = list(itertools.permutations(words))
maxscore, bestnatalie = 0, …