python - How to return data in separated function form the scrapy parse function? -


i have parse function using scrapy data website, function pass data function withen function, can not return output!, tried print worked need use return data in json file. how make printed func return items?

def parse(self, response):      all_tr= list()      tr in response.xpath('//tr').extract():            all_tr.append(tr)      tr_data = list()      city_tr = list()      tr in all_tr:            if re.findall(r'class="city".+name.+?<', tr):              city_tr.append(tr)            else:              pass      c= 0      const =1      while const ==1:           try:             start=city_tr[c]             end= city_tr[c+1]             indexstart=all_tr.index(start)             indexend=all_tr.index(end)             tr_data.append(all_tr[indexstart:indexend])             c=c+1           except indexerror:             const=2             tr_data.append(all_tr[all_tr.index(start):])      tr in tr_data:           func_2(tr)

i have operations in func_2, passing fnction "prin func"

def print_func(city,days, tr):     if len(days)==0:         item=propertiesitem()         item['name']= ""         item['city']= city         item['state']= "ca"         return item

print_func not return anything, please tell why?

scrapy checks return value of parse function. if call function inside , discard return value don't return parse function such

so code should change 

for tr in tr_data:     func_2(tr)

to

for tr in tr_data:     yield func_2(tr)

this make sure whatever item func_2 returns passed scrapy framework. in func_2 function calling print_func, need capture return value , pass calling function

def func_2(....):     ....     item = print_func(...)     ...     return item

you need value in parse function , yield there. returning function doesn't work.


Comments

Post a Comment

Popular posts from this blog

What is happening when Matlab is starting a "parallel pool"? -

running parallel cpu processes in matlab starts command parpool() according documentation , function: [creates] special job on pool of workers, , [connects] matlab client parallel pool. this function takes bit of time execute, on order of 30 seconds. in other multi-cpu paradigms openmp, parallel execution seems totally transparent -- i've never noticed behavior analogous matlab (granted i'm not experienced parallel programming). so, happening between time parpool() called , when finishes executing? takes long? parallel computing toolbox enables run matlab code in parallel using several different paradigms (e.g. jobs , tasks, parfor , spmd , parfeval , batch processing), , run either locally (parallelised across cores in local machine) or remotely (parallelised across machines in cluster - either 1 own, or 1 in cloud). in of these cases, code run on matlab workers , copies of matlab without interactive desktop. if you're intending run on remo...
Read more

angular - DownloadURL return null in below code -

when change file updated in firebase storage when try downloadurl show null. filechange(event: any) { const imagefolder: string = this.employee.id; const filelist: filelist = event.target.files; const file: file = filelist[0]; const storageref = firebase.storage().ref().child(`${imagefolder}/profile.jpg`).put(file); console.log(storageref.snapshot.downloadurl); } the put() asynchronous. if want url after file uploaded have this: firebase.storage().ref().child(`${imagefolder}/profile.jpg`).put(file).then((snapshot) => { storageref = snapshot.downloadurl: console.log(snapshot.downloadurl); });
Read more

php - Cannot override Laravel Spark authentication with own implementation -

during login process of laravel spark need request token of remote api. api stores exact same users , passwords laravel spark application. therefore need username , non hashed password of user during authentication process. i thought overriding authenticated method solution problem. in routes/web.php override post /login endpoint , pointing endpoint own logincontroller: <?php namespace app\http\controllers\auth; use illuminate\support\facades\log; use illuminate\http\request; use laravel\spark\http\controllers\auth\logincontroller sparklogincontroller; class logincontroller extends sparklogincontroller { /** * create new login controller instance. * * @return void */ public function __construct() { parent::__construct(); } /** * handle successful authentication attempt. * * @param request $request * @param \illuminate\contracts\auth\authenticatable $user * @return response */ public fu...
Read more