spiderman | General distributed crawler framework based on scrapy-redis
kandi X-RAY | spiderman Summary
kandi X-RAY | spiderman Summary
General distributed crawler framework based on scrapy-redis
Support
Quality
Security
License
Reuse
Top functions reviewed by kandi - BETA
- Creates a new job
- Open job in pycharm
- Return information about the spider
- Download file
- Check if file exists
- Return the path to a file
- Refreshes meta info about the spider
- Helper function for coalescing lists
- Make a scheduled request from data
- Get callback
- Decorator for redis
- Runs ssh
- Process a single item
- Kill a task
- Get detail job
- Clean the items in the dictionary
- Generate a bunch of job files
- Run a task
- Process an item
- Make list of jobs
- Run the worker
- Parses the response from a paginated response
- Patch the job
- Crawl generator
- Parse the detail response
- Process an item
spiderman Key Features
spiderman Examples and Code Snippets
Community Discussions
Trending Discussions on spiderman
QUESTION
This is a React.js
filter problem and I'm stuck here. The problem has static data of movies as an array of objects and we have to filter that data according to the checked state of different checkboxes.
Static Data:
...ANSWER
Answered 2021-May-30 at 22:52So I had to do a couple changes in your code in order to address for proper filtering:
- Added a
value
key on bothlistCheckboxesRating
andlistCheckboxesGenre
to use it for filtering.
QUESTION
I have a set of conditions which I'm passing in $match
stage but for some reason i'd want to fetch data with another set of conditions. These conditions should have to be used in 'OR' conjunction.
ANSWER
Answered 2021-May-27 at 07:22- Use
$or
operator to specify both conditions - to match internal fields use
$expr
expression condition with$gt
operator
QUESTION
I am having a problem when trying to print my ticket(child class) which is all my superclass variables are null or zero not initialized. this is my superclass:-
...ANSWER
Answered 2021-May-26 at 23:55When you reference super in the child class, it not bound to the Movie object you created in the main(). That is why you are getting a null value. Look here when I debug the code.
If you want to access the Movie object you created in main(), you can pass it and that will work.
QUESTION
Split out from Vaadin Dataprovider: how to avoid "auto-fetch"?.
Given a Vaadin Flow 19 app with a MainView extends AppLayout
, a GridView
and an EmptyView
And @PreserveOnRefresh
annotation is used on MainView
.
When returning to GridView
, the GridView
should be exactly in the same state as before:
- open
GridView
using button inMainView
for the first time -> Grid usesDataProvider
to fetch data from backend - enter "Spiderman" in
TextField
with caption "stateCheck" - switch to
EmptyView
using button inMainView
- in the real app: do something in
EmptyView
and potentially other views - return to
GridView
using button inMainView
for the 2nd time
Then (1) the TextField
with caption "stateCheck" should display the value "Spiderman"
And (2) the grid should still show the same data as before; it should not reload the data from the backend
Observed behaviour:
(1) is ok, but (2) not: the grid always calls fetch
method to get data from the backend.
How do I achieve the desired behavior?
Here's the code of my GridView
which also fakes the backend DataProvider
:
ANSWER
Answered 2021-May-01 at 08:23This is actually intentional behavior. The server side dataprovider listener needs to be removed when component is detached and rewired on attaching. The reason is that otherwise there would be listeners accumulating and producing a memory leakage. If you think your users would be using refresh page often, you should consider adding a cache to your application to optimize performance.
Now one could entertain with the idea of having this kind of caching of previous loaded data behavior via API in Grid also in Vaadin framework, as it may or may not be desirable. It is application specific.
If the use case of refreshing is really to get the fresh data of live and active database, it is actually desired that data is loaded when page is refreshed.
If the desire is to avoid extra bombarding of DB as data is known to be static, you want to have caching.
QUESTION
Use Case 1 is answered below, Use Case 2 has been moved to a separate question (Vaadin Flow: Returning to a view, the view should not reload data from the backend)
I'd like to use a Vaadin Flow (v14 LTS/v19) grid component backed by a lazy DataProvider
which does not automatically fetch data from the backend when the grid is shown.
There are at least two use cases:
- showing grid data does not make sense unless the user provided filter parameters
- returning to a
@PreserveOnRefresh
tagged view should not replace the shown data with current data. (further elaborated in update)
Being pretty new to Vaadin 14+, I could not figure out how to achieve this. Every time my GridView
is displayed, the count and fetch callbacks of DataProvider
are queried. The call originates from the DataCommunicator
of the grid.
So for Use Case 1: How to stop the DataProvider
from fetching data as long as it does not make sense?
And for Use Case 2: How to prevent overwriting the grid state when adding a grid to the UI for the second time?
Thanks a lot!
StackTrace to my fetch callback (Vaadin Flow 14):
...ANSWER
Answered 2021-Apr-29 at 20:37For Case 1: In the callback check if you have filter parameters, return an empty set if not. Using the new V17+ API it would look like this:
QUESTION
So I have been trying for quite some time to add a search functionality for my app using TMDB API. What I have managed to do so far is to be able to search for a movie only the first time, so here's the problem when I am trying to search for a movie for the second time it will keep showing me the old movie list from the first search results, never updating the list accordingly to the search.
For example, i searched for a spiderman movie, it will show me every movie that has the keyword spiderman in it, and then when i try to search again for a different movie with a different keyword it will keep showing me the results from spiderman search, so is there any way to reset MutableLiveData
list on every setOnClickListner
, so I ll be able to search and display new movies on every search?.
Thank you in advance.
Here are the classes:
...ANSWER
Answered 2021-Apr-16 at 23:58You need to change the page number from the query so that you can get more data from the API
Here you return only page=1
for every request
QUESTION
Using the following data set how can I make the data render properly in the table? Each row represents new row for the table and the objects inside each row represents the data for the columns:
...ANSWER
Answered 2021-Mar-31 at 20:39Something like this?
QUESTION
The Longest Common Subsequence (LCS)
problem is: given two sequences A
and B
, find the longest subsequence that is found both in A
and in B
. For example, given A = "peterparker"
and B = "spiderman"
, the longest common subsequence is "pera"
.
Can someone explain this Longest Common Subsequence
algorithm?
ANSWER
Answered 2021-Feb-15 at 01:09The missing bit here is "patience sorting", whose connection to longest increasing subsequence (LIS) is a bit subtle but well known. The final loop in the code is a bare bones implementation of patience sorting with "the greedy strategy". It does not, in general, compute a LIS directly, but rather the length of a LIS.
An easy-enough correctness proof, which includes a sketch of what's needed to reliably compute a LIS too (not just its length), can be found as Lemma 1 early in
"Longest Increasing Subsequences: From Patience Sorting to the Baik-Deift-Johansson Theorem" David Aldous and Persi Diaconis
QUESTION
Below is my attempt to search in an array for movies and display them. I have struggling with the java loop as I am not very good with them.
...ANSWER
Answered 2021-Mar-24 at 07:33This is probably not the most elegant solution, but I tried to stay close to your initial attempt:
QUESTION
Trying to launch scrapy from a py file with this command :
...ANSWER
Answered 2021-Mar-09 at 14:08I guess that's because generator doesn't actually runs before you'll retrieve its values. You could try to consume generator somehow:
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install spiderman
You can use spiderman like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
Support
Reuse Trending Solutions
Find, review, and download reusable Libraries, Code Snippets, Cloud APIs from over 650 million Knowledge Items
Find more librariesStay Updated
Subscribe to our newsletter for trending solutions and developer bootcamps
Share this Page