The `print` function requires a set of `Any` parameters. `String` is a `Any`. In this case Xcode is telling you that it implicitly coerced the optional string into an `Any` object (by transforming the `String` value in `Optional(value)`).

To avoid this warning, you can simply use a default value or unwrap the `String?`

    print(user?.email ?? &quot;User instance is nil&quot;)
    print(user!.email)

I have installed tensorflow version r0.11. 

In my file name `cartpole.py` I have imported `tensorflow`:

     import tensorflow as tf  

and use it:

     tf.reset_default_graph()

Trying to run my project in PyCharm I get this error:

    in &lt;module&gt;
    tf.reset_default_graph()
    AttributeError: module &#39;tensorflow&#39; has no attribute &#39;reset_default_graph&#39;

How can I fix this error?



AttributeError: module &#39;tensorflow&#39; has no attribute &#39;reset_default_graph&#39;

How can I listen to a FINAL dismissal of a `BottomSheetDialogFragment`? I want to save user changes on the final dismissal only...

I tried following:

**Method 1**

This only fires, if the dialog is dismissed by swiping it down (not on back press or on touch outside)


	@Override
    public Dialog onCreateDialog(Bundle savedInstanceState)
    {
        Dialog d = super.onCreateDialog(savedInstanceState);
        d.setOnShowListener(new DialogInterface.OnShowListener() {
            @Override
            public void onShow(DialogInterface dialog) {

                BottomSheetDialog d = (BottomSheetDialog) dialog;   
                FrameLayout bottomSheet = (FrameLayout) dialog.findViewById(android.support.design.R.id.design_bottom_sheet);

                BottomSheetBehavior behaviour = BottomSheetBehavior.from(bottomSheet);
                behaviour.setState(BottomSheetBehavior.STATE_EXPANDED);
                behaviour.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {
                    @Override
                    public void onStateChanged(@NonNull View bottomSheet, int newState) {
                        if (newState == BottomSheetBehavior.STATE_HIDDEN)
                        {
							// Bottom Sheet was dismissed by user! But this is only fired, if dialog is swiped down! Not if touch outside dismissed the dialog or the back button
                            Toast.makeText(MainApp.get(), &quot;HIDDEN&quot;, Toast.LENGTH_SHORT).show();
                            dismiss();
                        }
                    }

                    @Override
                    public void onSlide(@NonNull View bottomSheet, float slideOffset) {

                    }
                });
            }
        });
        return d;
    }

**Method 2**

This does not allow me to distinguish between a final dismissal and one that is coming from a screen rotation or activity recreation...

	 @Override
    public void onDismiss(DialogInterface dialog)
    {
        super.onDismiss(dialog);
		// this works fine but fires one time too often for my use case, it fires on screen rotation as well, although this is a temporarily dismiss only
        Toast.makeText(MainApp.get(), &quot;DISMISSED&quot;, Toast.LENGTH_SHORT).show();
    }

**Question**

How can I listen to an event that indicates, that the user has finished the dialog?

BottomSheetDialogFragment - listen to dismissed by user event

I have some error like this &quot;Expression implicitly coerced from `String?` to `Any`&quot; this is my code :

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -&gt; Bool {
        // Override point for customization after application launch.
        
        FIRApp.configure()
        FIRAuth.auth()?.signIn(withEmail: &quot;myemail@gmail.com&quot;, password: &quot;mypassword&quot;, completion: { (user, error) in
            if (error != nil) {
                print(user?.email)
            }else {
                print(error?.localizedDescription)
            }
        })
        
        return true
    }

Error in this line 

    print(user?.email)

And

    print(error?.localizedDescription)

Please help me

Expression implicitly coerced from &#39;String?&#39; to Any

I have some error like this "Expression implicitly coerced from <code>String?</code> to <code>Any</code>" this is my code :
<pre><code class="hljs language-swift">func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
 // Override point for customization after application launch.
 
 FIRApp.configure()
 FIRAuth.auth()?.signIn(withEmail: "myemail@gmail.com", password: "mypassword", completion: { (user, error) in
 if (error != nil) {
 print(user?.email)
 }else {
 print(error?.localizedDescription)
 }
 })
 
 return true
}
</code></pre>
Error in this line
<pre><code class="hljs language-scss">print(user?.email)
</code></pre>
And
<pre><code class="hljs language-go">print(error?.localizedDescription)
</code></pre>
Please help me

I get an error that my class doesn&#39;t conform the NSObjectProtocol, I don&#39;t know what this means. I have implemented all the function from the WCSessionDelegate so that is not the problem. Does somebody know what the issue is? Thanks!     



    import Foundation
    import WatchConnectivity
    
    class BatteryLevel: WCSessionDelegate {
        
        
        var session: WCSession? {
            didSet {
                if let session = session {
                    session.delegate = self
                    session.activate()
                }
            }
        }
        
        var batteryStatus = 0.0;
        
        func getBatteryLevel(){
            if WCSession.isSupported() {
                // 2
                session = WCSession.default()
                // 3
                session!.sendMessage([&quot;getBatteryLevel&quot;: &quot;&quot;], replyHandler: { (response) -&gt; Void in
                    if (response[&quot;batteryLevel&quot;] as? String) != nil {
                        self.batteryStatus = (response[&quot;batteryLevel&quot;] as? Double)! * 100
                    }
                }, errorHandler: { (error) -&gt; Void in
                    // 6
                    print(error)
                })
            }}
        
        
        func session(_ session: WCSession, activationDidCompleteWith activationState: WCSessionActivationState, error: Error?) {
        }
        
        func session(_ session: WCSession, didReceiveMessage message: [String : Any]) {
        }
    }

Class does not conform NSObjectProtocol

The biggest misunderstanding for me in Swift is the `throws` keyword. Consider the following piece of code:

    func myUsefulFunction() throws

We cannot really understand what kind of error it will throw. The only thing we know is that it might throw some error. The only way to understand what the error might be is by looking at the documentation or checking the error at runtime.

But isn&#39;t this against Swift&#39;s nature? Swift has powerful generics and a type system to make the code expressive, yet it feels as if `throws` is exactly opposite because you cannot get anything about the error from looking at the function signature.

Why is that so? Or have I missed something important and mistook the concept?


Why is &#39;throws&#39; not type safe in Swift?

In my application I added one object in array when select cell and unselect and remove object when re-select cell. I used that code but give me error.

	extension Array {
		func indexOfObject(object : AnyObject) -&gt; NSInteger {
			return (self as NSArray).indexOfObject(object)
		}
		
	    mutating func removeObject(object : AnyObject) {
			for var index = self.indexOfObject(object); index != NSNotFound; index = self.indexOfObject(object) {
				self.removeAtIndex(index)
			}
		}
	}
    
    class MyViewController: UITableViewController {
        var arrContacts: [Any] = []
        var contacts: [Any] = []
        
        func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
    		arrContacts.removeObject(contacts[indexPath.row])
    	}
    }

It gives me 2 error like that:

    C-style for statement has been removed in Swift 3
    Value of type &#39;[Any]&#39; has no member &#39;removeObject&#39;


Removing object from array in Swift 3

I have some protocols

**LoginStrategy**

    public protocol LoginStrategy {
        func login(_ viewController: UIViewController)
        func getUserInfo(withCompletionHandler completionHandler: @escaping (_ userInfo: [String: Any]?) -&gt; ())
        func createLoginButton(_ frame: CGRect, withCompletionHandler completionHandler: @escaping (_ loginButton: UIView) -&gt; ())
        func getUserId() -&gt; String
    }

and two classes:

**LoginProvider**

    public class LoginProvider {
        
        public let strategy: LoginStrategy
        
        public func login(_ viewController: UIViewController) {
            return self.strategy.login(viewController)
        }
        
        public func getUserInfo(withCompletionHandler completionHandler: @escaping (_ userInfo: [String: Any]?) -&gt; ()) {
            return self.strategy.getUserInfo(withCompletionHandler: completionHandler)
        }
        
        public func createLoginButton(_ frame: CGRect, withCompletionHandler completionHandler: @escaping (_ loginButton: UIView) -&gt; ()) {
            return self.strategy.createLoginButton(frame, withCompletionHandler: completionHandler)
        }
        
        public func getUserId() -&gt; String {
            return self.strategy.getUserId()
        }
        
        public init(strategy: LoginStrategy) {
            self.strategy = strategy
        }
        
    }

**FacebookLoginStrategy**

    import Foundation
    import FacebookCore
    import FacebookLogin
    
    public class FacebookLoginStrategy: LoginStrategy {
        
        public var grantedPermissions: Set&lt;Permission&gt;? = nil
    
        public var declinedPermissions: Set&lt;Permission&gt;? = nil
        
        public var userId: String = &quot;&quot;
        
        public func login(_ viewController: UIViewController) {
            let loginManager = LoginManager()
            let permissions: [ReadPermission] = [.publicProfile, .userFriends, .email]
            loginManager.logIn(permissions, viewController: viewController) { loginResult in
                switch loginResult {
                case .failed(let error):
                    print(error)
                case .cancelled:
                    print(&quot;User cancelled login.&quot;)
                case .success(let grantedPermissions, let declinedPermissions, let accessToken):
                    self.userId = accessToken.userId ?? &quot;&quot;
                    self.grantedPermissions = grantedPermissions
                    self.declinedPermissions = declinedPermissions
                    print(&quot;Logged in!&quot;)
                }
            }
        }
        
        public func getUserId() -&gt; String {
            return userId
        }
        
        public func getUserInfo(withCompletionHandler completionHandler: @escaping (_ userInfo: [String: Any]?) -&gt; ()) {
            let request = GraphRequest(graphPath: &quot;me&quot;, parameters: [&quot;fields&quot;:&quot;email, name&quot;], accessToken: AccessToken.current, httpMethod: .GET, apiVersion: FacebookCore.GraphAPIVersion.defaultVersion)
            request.start { (response, result) in
                switch result {
                case .success(let value):
                    print(value.dictionaryValue)
                    completionHandler(value.dictionaryValue)
                case .failed(let error):
                    print(error)
                }
            }
        }
    
        public func createLoginButton(_ frame: CGRect, withCompletionHandler completionHandler: @escaping (_ loginButton: UIView) -&gt; ()) {
            let permissions: [ReadPermission] = [.publicProfile, .userFriends, .email]
            let loginButton = LoginButton(readPermissions: permissions)
            loginButton.frame = frame
            completionHandler(loginButton)
        }
    }

In my **ViewController**:

When I use:

    let facebookLoginProvider = LoginProvider(strategy: FacebookLoginStrategy())

It says:

&gt; &#39;FacebookLoginStrategy&#39; is inaccessable due to &#39;internal&#39; protection
&gt; level


Initializer is inaccessable due to &#39;internal&#39; protection level

In rare occasions, the overlay on my map (small blue dot) gets a weird glare (big blue area on right) (as seen in picture). Sometimes zooming in or out will fix it, but not always. Can&#39;t find anything on why this would happen. Is it something to do with how it is rendered?


[![enter image description here][1]][1]


    func drawLocations(_ loc: CLLocation)
        {
            let center = CLLocationCoordinate2D(latitude: loc.coordinate.latitude, longitude: loc.coordinate.longitude)
            let lat: CLLocationDegrees = center.latitude
            let long: CLLocationDegrees = center.longitude
            var points = [CLLocationCoordinate2DMake(lat,long),CLLocationCoordinate2DMake(lat,long),CLLocationCoordinate2DMake(lat,long),CLLocationCoordinate2DMake(lat,long)]
            let polygon = MKPolygon(coordinates: &amp;points, count: points.count)
            DispatchQueue.main.async(execute: {
                self.mapView.add(polygon)
            })
        }
    func mapView(_ mapView: MKMapView!, rendererFor overlay: MKOverlay!) -&gt; MKOverlayRenderer!
        {
            if overlay is MKPolygon
            {
                let polygonView = MKPolygonRenderer(overlay: overlay)
                polygonView.lineWidth = 4
                polygonView.strokeColor = UIColor(red: 30/255.0, green: 12/255.0, blue: 242/255.0, alpha: 0.4)
                return polygonView
            }
            return nil
        }


  [1]: https://i.stack.imgur.com/ifRdp.jpg

Swift MKMapView Polygon Overlay glitching

I am working on a project using Typescript and some of the ES6 features exposed by Typescript like ES6 String Literals e.g. `` `Something ${variable} Something else` ``.

Whilst debugging a problem I dropped a breakpoint into my typescript file to step through it in the source panel, which usually works fine.

But Chrome Dev Tools has an issue with ES6 String literals and doesn&#39;t seem to recognise the end of an ES6 String literal.

Instead all code following the string literal is marked red (string highlighting in debugger) and blocked from variable inspection as chrome debugger seems to think it is all one massive string.

Has someone encountered this issue, found a fix or knows whether this is on Google&#39;s roadmap for Chrome Dev Tools?

**EDIT 1:**  
Looks like this issue is currently being worked on by the Chromium team. See issue report for updates:  
[bugs.chromium.org/p/chromium/issues/detail?id=659515][1]

**EDIT 2:**
Bug has been open for quite some time, but doesn&#39;t seem to have been prioritised. If you experience the issue go to the chromium link above and star/comment on it with helpful info to move it into focus of the Dev Tools team.   


  [1]: http://bugs.chromium.org/p/chromium/issues/detail?id=659515

Chrome Dev Tools Issue With ES6 String Literals/Typescript

I have a python Code that will recognize speech using the Google STT engine and give me back the results but I get the results in strings with &quot;quotes&quot;. I don&#39;t want that quotes in my code as I will use it to run many commands and it doesn&#39;t work. I haven&#39;t tried anything so far as I didn&#39;t get anything to try!
This is the function in the  python code that will recognize speech:

    def recog():
        p = subprocess.Popen([&#39;./speech-recog.sh&#39;], stdout=subprocess.PIPE,
                                                stderr=subprocess.PIPE)
        global out,err
        out, err = p.communicate()
        print out

This is speech-recog.sh:
    
    #!/bin/bash

    hardware=&quot;plughw:1,0&quot;
    duration=&quot;3&quot;
    lang=&quot;en&quot;
    hw_bool=0
    dur_bool=0
    lang_bool=0
    for var in &quot;$@&quot;
    do
        if [ &quot;$var&quot; == &quot;-D&quot; ] ; then
            hw_bool=1
        elif [ &quot;$var&quot; == &quot;-d&quot; ] ; then
            dur_bool=1
        elif [ &quot;$var&quot; == &quot;-l&quot; ] ; then
            lang_bool=1
        elif [ $hw_bool == 1 ] ; then
            hw_bool=0
            hardware=&quot;$var&quot;
        elif [ $dur_bool == 1 ] ; then
            dur_bool=0
            duration=&quot;$var&quot;
        elif [ $lang_bool == 1 ] ; then
            lang_bool=0
            lang=&quot;$var&quot;
        else
            echo &quot;Invalid option, valid options are -D for hardware and -d for duration&quot;
        fi
    done

    arecord -D $hardware -f S16_LE -t wav -d $duration -r 16000 | flac - -f --best --sample-rate 16000 -o /dev/shm/out.flac 1&gt;/dev/shm/voice.log 2&gt;/dev/shm/voice.log; curl -X POST --data-binary @/dev/shm/out.flac --user-agent &#39;Mozilla/5.0&#39; --header &#39;Content-Type: audio/x-flac; rate=16000;&#39; &quot;https://www.google.com/speech-api/v2/recognize?output=json&amp;lang=$lang&amp;key=key&amp;client=Mozilla/5.0&quot; | sed -e &#39;s/[{}]/&#39;&#39;/g&#39; | awk -F&quot;:&quot; &#39;{print $4}&#39; | awk -F&quot;,&quot; &#39;{print $1}&#39; | tr -d &#39;\n&#39;

    rm /dev/shm/out.flac
This was taken from Steven Hickson&#39;s Voicecommand Program made for Raspberry Pi

Remove quotes from String in Python

A new Rustacean like me struggles with juggling these types: `String`, `&amp;str`, `Vec&lt;u8&gt;`, `&amp;[u8]`.

In time, I hope to have an epiphany and suddenly get why some library calls use one or the other. Until then, I need help to map out each idiomatic transition.

Given these types:

    let st: &amp;str = ...;
    let s:  String = ...;
    let u:  &amp;[u8] = ...;
    let v:  Vec&lt;u8&gt; = ...;

I think I have figured these out, but are they idiomatic?

&lt;!-- language: none --&gt;

    &amp;str    -&gt; String    String::from(st)
    &amp;str    -&gt; &amp;[u8]     st.as_bytes()
    String  -&gt; &amp;str      s.as_str()
    &amp;[u8]   -&gt; &amp;str      str::from_utf8(u)
    Vec&lt;u8&gt; -&gt; String    String::from_utf8(v)

Ultimately I want a complete table of transitions for these types:

&lt;!-- language: none --&gt;

    &amp;str    -&gt; String
    &amp;str    -&gt; &amp;[u8]
    &amp;str    -&gt; Vec&lt;u8&gt;
    String  -&gt; &amp;str
    String  -&gt; &amp;[u8]
    String  -&gt; Vec&lt;u8&gt;
    &amp;[u8]   -&gt; &amp;str
    &amp;[u8]   -&gt; String
    &amp;[u8]   -&gt; Vec&lt;u8&gt;
    Vec&lt;u8&gt; -&gt; &amp;str
    Vec&lt;u8&gt; -&gt; String
    Vec&lt;u8&gt; -&gt; &amp;[u8]


How do I convert between String, &amp;str, Vec&lt;u8&gt; and &amp;[u8]?

I came across *[“CorruptedString” (Solution)][1]*. Here is following code of program from the book:

    var s = &quot;Hello&quot;;
    string.Intern(s);
    unsafe
    {
      fixed (char* c = s)
        for (int i = 0; i &lt; s.Length; i++)
          c[i] = &#39;a&#39;;
    }
    Console.WriteLine(&quot;Hello&quot;); // Displays: &quot;aaaaa&quot;

Why does this program display &quot;aaaaa&quot;? I understand this program as follows:

 1. The [CLR][2] reserves &quot;hello&quot; in the intern pool (I image the intern pool as a set of strings).
 2. `string.Intern(s)` actually does nothing, because the CLR had reserved &quot;Hello&quot; string - it just returns address of reserved &quot;Hello&quot; string (object s has the same address)
 3. The program changes the content of the &quot;Hello&quot; string via a pointer
 4. ??? The Hello string should be absent in the intern pool, and it should be error! But it is OK; the program runs successfully.

As I understand the intern pool, it is like some kind of dictionary of string to string. Or maybe I missed something?

  [1]: http://problembook.net/content/en/Strings/CorruptedString-S.html
  [2]: http://en.wikipedia.org/wiki/Common_Language_Runtime



Corrupted string in C#

I wonder what&#39;s the correct way of converting (deserializing) a string to a Python&#39;s Enum class. Seems like `getattr(YourEnumType, str)` does the job, but I&#39;m not sure if it&#39;s safe enough.

Just to be more specific, I would like to convert a `&#39;debug&#39;`string to an Enum object like this:

    class BuildType(Enum):
        debug = 200
        release = 400



Convert string to Enum in Python

I&#39;m trying to make something like this:

     private String getStringIfObjectIsPresent(Optional&lt;Object&gt; object){
            object.ifPresent(() -&gt;{
                String result = &quot;result&quot;;
                //some logic with result and return it
                return result;
            }).orElseThrow(MyCustomException::new);
        }

This won&#39;t work, because ifPresent takes Consumer functional interface as parameter, which has void accept(T t). It cannot return any value. Is there any other way to do it ?


Java 8 optional: ifPresent return object orElseThrow exception

Since beta 8.3, zillions warnings &quot;String interpolation produces a debug description for an optional value; did you mean to make this explicit?&quot; appeared in my code.

For example, the warning popped in the following situation up, where options could lead to nil:

    let msg = &quot;*** Error \(options[&quot;taskDescription&quot;]): cannot load \(sUrl) \(error)&quot;

As previously designed, it was ok for me (and the compiler) the optionals to be interpolated as &#39;nil&#39;. But compiler changed its mind.

What the compiler suggests is to add a String constructor with description as follows:

    let msg = &quot;*** Error \(String(describing: options[&quot;taskDescription&quot;])): cannot load \(sUrl) \(error)&quot;

Obviously, the results is explicit but also very very cumbersome in my opinion. Is there a better option? Do I have to fix all those warning or better wait for the next beta?

[![Screenshot for description][1]][1]


  [1]: https://i.stack.imgur.com/llT41.png

How to solve &quot;String interpolation produces a debug description for an optional value; did you mean to make this explicit?&quot; in Xcode 8.3 beta?

I do user and invitation validation using the Optional facility

    @DeleteMapping(&quot;/friends/{username}&quot;)
    public
    HttpEntity&lt;Boolean&gt; removeFriend(
            @ApiParam(value = &quot;The user&#39;s name&quot;, required = true) @PathVariable String username
    ) {
        Long fromId = authorizationService.getUserId();

        return userService.findByUsername(username)
                .map(user -&gt; {
                     return friendshipService.findFriendship(fromId, user.getId())
                            .map(friendship -&gt; {
                                friendshipService.removeFriendship(friendship);

                                friendship.setToId(friendship.getFromId());
                                friendship.setFromId(friendship.getToId());

                                friendshipService.removeFriendship(friendship);

                                return ResponseEntity.ok(true);
                            }).orElseGet(() -&gt; ResponseEntity.notFound().build());
                }).orElseThrow(() -&gt; new ResourceNotFoundException(&quot;User not found&quot;));
However, `IntelliJ` is colouring my grey `return`, But when I remove the `return`, it highlights to me that there is no `return`.

Could someone explain how it works and what is it all about?

Statement lambda can be replaced with expression lambda

I have some (simplified) code that uses Java Optionals:

    Optional&lt;User&gt; maybeTarget = userRepository.findById(id1);
    Optional&lt;String&gt; maybeSourceName = userRepository.findById(id2).map(User::getName);
    Optional&lt;String&gt; maybeEventName = eventRepository.findById(id3).map(Event::getName);

    maybeTarget.ifPresent(target -&gt; {
        maybeSourceName.ifPresent(sourceName -&gt; {
            maybeEventName.ifPresent(eventName -&gt; {
                sendInvite(target.getEmail(), String.format(&quot;Hi %s, $s has invited you to $s&quot;, target.getName(), sourceName, meetingName));
            }
        }
    }

Needless to say, this looks and feels bad. But I can&#39;t think of another way to do this in a less-nested and more readable way. I considered streaming the 3 Optionals, but discarded the idea as doing a `.filter(Optional::isPresent)` then a `.map(Optional::get)` feels even worse.

So is there a better, more &#39;Java 8&#39; or &#39;Optional-literate&#39; way of dealing with this situation (essentially **multiple Optionals all needed to compute a final operation**)?

How to use Java 8 Optionals, performing an action if all three are present?

I have the below code which is bit ugly for multiple null checks.

    String s = null;
    
    if (str1 != null) {
    	s = str1;
    } else if (str2 != null) {
    	s = str2;
    } else if (str3 != null) {
    	s = str3;
    } else {
        s = str4;
    }

So I tried using `Optional.ofNullable` like below, but its still difficult to understand if someone reads my code. what  is the best approach to do that in Java 8.  

    String s = Optional.ofNullable(str1)
                       .orElse(Optional.ofNullable(str2)
                                       .orElse(Optional.ofNullable(str3)
                                                       .orElse(str4)));

In Java 9, we can use `Optional.ofNullable`with `OR`, But in Java8 is there any other approach ?

Content Type	Original Author	Original Content on Stackoverflow
Question	Dewangga Arie Baskara	View Question on Stackoverflow
Solution 1 - Swift	Luca D'Alberti	View Answer on Stackoverflow

Expression implicitly coerced from 'String?' to Any

Swift Problem Overview

Swift Solutions

Solution 1 - Swift

BottomSheetDialogFragment - listen to dismissed by user event

AttributeError: module 'tensorflow' has no attribute 'reset_default_graph'

Attributions