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How to pass a user defined argument in scrapy spider
I am trying to pass a user defined argument to a scrapy's spider. Can anyone suggest on how to do that?
5 Answers
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What's wrong with foreign keys?
...key (if I remember correctly). However, to me they seem pretty vital to avoid duplication and subsequent data integrity problems throughout your database.
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What Process is using all of my disk IO
...
iotop seems to be showing I/O bandwidth rather than the number of IOPS consumed by processes. This is not super relevant. A process doing lots of small writes+sync is going to consume more of the disk's IO capacity than a process writing a large contiguous bat...
What's the difference between “Write-Host”, “Write-Output”, or “[console]::WriteLine”?
...ost ("count=" + $count)
# or
write-host "count=$count"
BTW - Watch this video of Jeffrey Snover explaining how the pipeline works. Back when I started learning PowerShell I found this to be the most useful explanation of how the pipeline works.
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How can I save an image with PIL?
...is code for my problem, but I get plain black images. Does anyone have any idea about this? stackoverflow.com/questions/24266000/…
– user961627
Jun 17 '14 at 15:08
add a com...
moving changed files to another branch for check-in
...ing to is up to date with the branch you are on. If for example you are accidentally working on prod branch and need to switch to stage branch but stage has changed in the mean-time stash is the only way to make the switch.
– danielson317
Jul 6 '19 at 17:50
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what's the difference between “hadoop fs” shell commands and “hdfs dfs” shell commands?
...gument to hadoop fs commands (e.g. hdoop fs -ls file:///). If nothing is said, it defaults to hdfs schema, AFAIK (hdoop fs -ls / == hadoop fs -ls hdfs:///).
– frb
Mar 9 '15 at 12:04
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The purpose of Model View Projection Matrix
...an u suggest any sample code for pan functionality in Opengl Es2.0 in Android using this Model View Projection Matrix if Possible. I refereed more links, i could not get any clear idea.if any sample code means, its easy to understand for me..
– harikrishnan
Jun...
async await return Task
...return from async methods are wrapped in a Task.
If you return no value(void) it will be wrapped in Task, If you return int it will be wrapped in Task<int> and so on.
If your async method needs to return int you'd mark the return type of the method as Task<int> and you'll return plain...
Ask for User Permission to Receive UILocalNotifications in iOS 8
...this,
Update for Swift 2.0
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {
// Override point for customization after application launch.
if(UIApplication.instancesRespondToSelector(Selector("registerUserNotificationSetti...