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Want to make sure writer's skills match your needs? Get more details on how to choose the appropriate author. Those who frequently travel, especially between time zones, may notice problems with their Wi-Fi because the date and time of your android smartphone plays an important role. It must match the date and time on the router that you are trying to connect to, or else you may not establish a connection.
Next, you must change the date and time to your current location and then connect to the Wi-Fi. Instead, they emerge from the router, which is being used to connect to the wireless network. The router can be causing the problem, and it may require a firmware update so that your problem is fixed.
Check if any firmware updates are pending for your router and update it. You may have to follow the steps for updating your router by using a manual, or you can get help online for your router. Once you have updated your router, try connecting your phone to the Wi-Fi network again and check if the problem is fixed.
How to update the firmware in my modem — Read this PDF guide from d-link source. If your Samsung Galaxy cannot connect to the WiFi network, then one of the steps to resolve the problem is to delete the cache and data of Wi-Fi Direct. Deleting this data will not cause any problems because the phone automatically created new cache files if the old one has been deleted. However, you may end up losing any passwords that may have been saved on it.
So make sure you know the network name and password for the network you usually connect to. If you had faced a similar problem when you updated your phone, you might find this solution to be helpful.
Once the cache partition is wiped, new data is automatically created on the phone. Once removing the cache files is complete, you will be back on the same menu. Use the Volume buttons to highlight the option, Reboot System Now, and your phone will restart and go back to normal mode. Connect to the Wi-Fi and check if it works. This solution has been constructive if the Wi-Fi does not work after a recent update or does not work because the cache files of the system were corrupted.
Read more — Android battery drain. When you reset a device to factory settings, you are putting it back into the original state. It means all data, including the applications you had downloaded, will be lost. It is necessary to create a backup for the data before proceeding with a factory reset. You can either use the inbuilt backup option, or you can choose to back up the data manually to a computer or use an app. Your phone will take some time to reset to factory settings, and it will restart.
Once this is done, try to check if your problem is fixed after the factory reset. It is commonly noticed on many Android phones. When you try to scan a hidden network, you will not be able to connect to it. To solve this problem, you can either unhide the network if you have access to the network settings or add the network manually to connect to it.
To add the network manually, you must know the network name SSID and password, and encryption type. Does the Wi-Fi connection disconnect every time your phone goes to sleep? The problem of a dropping connection is usually caused by the settings of your Wi-Fi which may cause the Wi-Fi to disconnect every time your phone is in sleep mode.
The settings can be changed so that the Wi-Fi is on all the time and you do not miss out on important emails or messages when your phone is inactive. Check Solution 10 for further details. Simply rebooting your device times can solve this issue. Slow connections can be very annoying. None of us enjoy a Wi-Fi connection that makes us wait too long to open the websites or watch a video.
Many providers blame it on the peak hours when numerous people connect to Wi-Fi at the same time. It is caused by Wi-Fi channels where most of the users are on the same Wi-Fi channel simultaneously. Setter and Getter Methods: We can set and get the values of instance variables by using getter and setter methods.
Setter Method: setter methods can be used to set values to the instance variables. Getter Method: Getter methods can be used to get values of the instance variables. Getter methods also known as accessor methods.
Class Methods: Inside method implementation if we are using only class variables static variables , then such type of methods we should declare as class method. We can declare class method explicitly by using classmethod decorator. For class method we should provide cls variable at the time of declaration. Cat walks with 4 legs Static Methods: In general these methods are general utility methods. Inside these methods we won't use any instance or class variables.
Here we won't provide self or cls arguments at the time of declaration. We can declare static method explicitly by using staticmethod decorator We can access static methods by using classname or object reference. Note: In general we can use only instance and static methods.
Inside static method we can access class level variables by using class name. Passing members of one class to another class: We can access members of one class inside another class. Inner classes: Sometimes we can declare a class inside another class,such type of classes are called inner classes.
Without existing one type of object if there is no chance of existing another type of object,then we should go for inner classes. Example: Without existing Car object there is no chance of existing Engine object. Hence Engine class should be part of Car class. Hence Head should be part of Human.
Note: Without existing outer class object there is no chance of existing inner class object. Hence inner class object is always associated with outer class object. Inner 11 i. Dob 5 def display self : 6 print 'Name:',self. Head 6 self. Brain 7 def display self : 8 print "Hello.. Usually programmer taking very much care while creating object, but neglecting destruction of useless objects. Because of his neglectance, total memory can be filled with useless objects which creates memory problems and total application will be down with Out of memory error.
But in Python, We have some assistant which is always running in the background to destroy useless objects. Because this assistant the chance of failing Python program with memory problems is very less.
This assistant is nothing but Garbage Collector. If an object does not have any reference variable then that object eligible for Garbage Collection. How to enable and disable Garbage Collector in our program: By default Gargbage collector is enabled, but we can disable based on our requirement.
In this context we can use the following functions of gc module. Once destructor execution completed then Garbage Collector automatically destroys that object. Note: The job of destructor is not to destroy object and it is just to perform clean up activities. Output Object Initialization Fulfilling Last Wish and performing clean up activities End of application.
Output Constructor Execution Constructor Execution Destructor Execution Morphs means forms. Polymorphism means 'Many Forms'. Eg1: Yourself is best example of polymorphism. In front of Your parents You will have one type of behaviour and with friends another type of behaviour. Same person but different behaviours at different places,which is nothing but polymorphism.
Eg4: The Same method with different implementations in Parent class and child classes. Overloading 1. Operator Overloading 2. Method Overloading 3. Constructor Overloading. Based on provided value at runtime the type will be considered automatically. What is the type of obj? We cannot decide at the beginning. At runtime we can pass any type. Then how we can decide the type? At runtime if 'it walks like a duck and talks like a duck,it must be duck'. Python follows this principle.
This is called Duck Typing Philosophy of Python. The problem in this approach is if obj does not contain talk method then we will get AttributeError. Traceback most recent call last : File "test. Eg3: We can use deposit method to deposit cash or cheque or dd deposit cash deposit cheque deposit dd. There are 3 types of overloading 1. Operator Overloading: We can use the same operator for multiple purposes, which is nothing but operator overloading. For every operator Magic Methods are available.
To overload any operator we have to override that Method in our class. We have to override this method in our class. Method Overloading: If 2 methods having same name but different type of arguments then those methods are said to be overloaded methods.
But in Python Method overloading is not possible. If we are trying to declare multiple methods with same name and different number of arguments then Python will always consider only last method. How we can handle overloaded method requirements in Python: Most of the times, if method with variable number of arguments required then we can handle with default arguments or with variable number of argument methods.
Constructor Overloading: Constructor overloading is not possible in Python. If we define multiple constructors then the last constructor will be considered.
But based on our requirement we can declare constructor with default arguments and variable number of arguments. Output: Constructor with 0 1 2 3 number of arguments Constructor with 0 1 2 3 number of arguments Constructor with 0 1 2 3 number of arguments Constructor with 0 1 2 3 number of arguments. Output: Constructor with variable number of arguments Constructor with variable number of arguments Constructor with variable number of arguments Constructor with variable number of arguments Constructor with variable number of arguments.
If the child class not satisfied with parent class implementation then child class is allowed to redefine that method in the child class based on its requirement. This concept is called overriding.
Overriding concept applicable for both methods and constructors. From Overriding method of child class,we can call parent class method also by using super method. Output: Child Constructor In the above example,if child class does not contain constructor then parent class constructor will be executed. Eg 1: We can write a regular expression to represent all mobile numbers Eg 2: We can write a regular expression to represent all mail ids.
To develop Translators like compilers, interpreters etc 4. To develop digital circuits 5. We can develop Regular Expression Based applications by using python module: re This module contains several inbuilt functions to use Regular Expressions very easily in our applications. Output: Important functions of re module: 1. If the match is available then we will get Match object, otherwise we will get None.
If complete string matched then this function returns Match object otherwise it returns None. If the match is available then it returns the Match object which represents first occurrence of the match. If the match is not available then it returns None. This function returns a list object which contains all occurrences. On each match object we can call start , end and group functions.
This function returns a tuple where first element is result string and second element is number of replacements. This function returns list of all tokens. Note: If we want to ignore case then we have to pass 3rd argument re.
Rules: 1. The allowed characters are a-z,A-Z,, 2. The first character should be a lower case alphabet symbol from a to k 3. The second character should be a digit divisible by 3 4. The length of identifier should be atleast 2. App2: Write a python program to check whether the given string is Yava language identifier or not? Every number should contains exactly 10 digits 2.
The first digit should be 7 or 8 or 9. App4: Write a Python Program to check whether the given number is valid mobile number or not? App5: Write a python program to extract all mobile numbers present in input. In web scraping to match our required patterns like mail ids, mobile numbers we can use regular expressions. I 10 print title[0]. Eg: Program to get all phone numbers of redbus.
I 6 for n in numbers: 7 print n. Write a Python Program to check whether the given mail id is valid gmail id or not? Write a python program to check whether given car registration number is valid Telangana State Registration number or not? There are 2 types of Multi Tasking 1. Process based Multi Tasking 2.
Thread based Multi Tasking. Executing several tasks simmultaneously where each task is a seperate independent process is called process based multi tasking. Eg: while typing python program in the editor we can listen mp3 audio songs from the same system. At the same time we can download a file from the internet.
All these taks are executing simultaneously and independent of each other. Hence it is process based multi tasking. Executing several tasks simultaneously where each task is a seperate independent part of the same program, is called Thread based multi tasking, and each independent part is called a Thread. Note: Whether it is process based or thread based, the main advantage of multi tasking is to improve performance of the system by reducing response time.
The main important application areas of multi threading are: 1. To implement Multimedia graphics 2. To develop animations 3. To develop video games 4. To develop web and application servers etc Note: Where ever a group of independent jobs are available, then it is highly recommended to execute simultaneously instead of executing one by one. For such type of cases we should go for Multi Threading.
Python provides one inbuilt module "threading" to provide support for developing threads. Hence developing multi threaded Programs is very easy in python. On this object if we call getName method then we will get current executing thread name.
We can create a thread in Python by using 3 ways 1. Creating a Thread without using any class 2. Creating a Thread by extending Thread class 3. Creating a Thread without extending Thread class. If multiple threads present in our program, then we cannot expect execution order and hence we cannot expect exact output for the multi threaded programs. B'z of this we cannot provide exact output for the above program.
It is varied from machine to machine and run to run. Note: Thread is a pre defined class present in threading module which can be used to create our own Threads. We have to create child class for Thread class. In that child class we have to override run method with our required job. Whenever we call start method then automatically run method will be executed and performs our job.
Every thread in python has name. It may be default name generated by Python or Customized Name provided by programmer. Thread Identification Number ident : For every thread internally a unique identification number is available.
We can access this id by using implicit variable "ident". Whenever Main Thread runs with low memory, immediately PVM runs Garbage Collector to destroy useless objects and to provide free memory,so that Main Thread can continue its execution without having any memory problems. We can check whether thread is Daemon or not by using t.
We can change Daemon nature by using setDaemon method of Thread class. Default Nature: By default Main Thread is always non-daemon. But for the remaining threads Daemon nature will be inherited from parent to child. Note: Main Thread is always Non-Daemon and we cannot change its Daemon Nature b'z it is already started at the beginning only.
In the above program if we comment Line-1 then both Main Thread and Child Threads are Non Daemon and hence both will be executed until their completion. Hence whenever MainThread terminates automatically child thread will be terminated.
Synchronization: If multiple threads are executing simultaneously then there may be a chance of data inconsistency problems. We are getting irregular output b'z both threads are executing simultaneously wish function. The main application areas of synchronization are 1.
Online Reservation system 2. Funds Transfer from joint accounts etc. In Python, we can implement synchronization by using the following 1.
Lock 2. RLock 3. Synchronization By using Lock concept: Locks are the most fundamental synchronization mechanism provided by threading module. The Lock object can be hold by only one thread at a time. If any other thread required the same lock then it will wait until thread releases lock.
Note: To call release method compulsory thread should be owner of that lock. In the above program at a time only one thread is allowed to execute wish method and hence we will get regular output. The standard Lock object does not care which thread is currently holding that lock.
If the lock is held and any thread attempts to acquire lock, then it will be blocked,even the same thread is already holding that lock. If the Thread calls recursive functions or nested access to resources,then the thread may trying to acquire the same lock again and again,which may block our thread.
To overcome this problem, we should go for RLock Reentrant Lock. Reentrant means the thread can acquire the same lock again and again. If the lock is held by other threads then only the thread will be blocked.
Reentrant facility is available only for owner thread but not for other threads. In this case Main Thread won't be Locked b'z thread can acquire the lock any number of times. This RLock keeps track of recursion level and hence for every acquire call compulsory release call should be available. Note: 1. Only owner thread can acquire the lock multiple times 2.
The number of acquire calls and release calls should be matched. Lock: 1. Lock object can be acquired by only one thread at a time. Even owner thread also cannot acquire multiple times. Not suitable to execute recursive functions and nested access calls 3. In this case Lock object will takes care only Locked or unlocked and it never takes care about owner thread and recursion level.
RLock: 1. RLock object can be acquired by only one thread at a time, but owner thread can acquire same lock object multiple times. Best suitable to execute recursive functions and nested access calls 3. In this case RLock object will takes care whether Locked or unlocked and owner thread information, recursiion level. Synchronization by using Semaphore: In the case of Lock and RLock,at a time only one thread is allowed to execute.
Sometimes our requirement is at a time a particular number of threads are allowed to access like at a time 10 memebers are allowed to access database server,4 members are allowed to access Network connection etc. To handle this requirement we cannot use Lock and RLock concepts and we should go for Semaphore concept.
Here counter represents the maximum number of threads are allowed to access simultaneously. The default value of counter is 1. Whenever thread executes acquire method,then the counter value will be decremented by 1 and if thread executes release method then the counter value will be incremented by 1. It is exactly same as Lock concept. The remaining threads have to wait until releasing the semaphore. In the above program at a time 2 threads are allowed to access semaphore and hence 2 threads are allowed to execute wish function.
The number of release calls can exceed the number of acquire calls also. BounedSemaphore is exactly same as Semaphore except that the number of release calls should not exceed the number of acquire calls,otherwise we will get. ValueError: Semaphore released too many times It is invalid b'z the number of release calls should not exceed the number of acquire calls in BoundedSemaphore.
Note: To prevent simple programming mistakes, it is recommended to use BoundedSemaphore over normal Semaphore. The main advantage of synchronization is we can overcome data inconsistency problems. But the main disadvantage of synchronization is it increases waiting time of threads and creates performance problems.
Hence if there is no specific requirement then it is not recommended to use synchronization. Inter Thread Communication: Some times as the part of programming requirement, threads are required to communicate with each other.
This concept is nothing but interthread communication. Eg: After producing items Producer thread has to communicate with Consumer thread to notify about new item.
Then consumer thread can consume that new item. Interthread communication by using Event Objects: Event object is the simplest communication mechanism between the threads. One thread signals an event and other thereds wait for it. Event manages an internal flag that can set or clear Threads can wait until event set. Methods of Event class: 1. Output: Consumer thread is waiting for updation Producer thread producing items Producer thread giving notification by setting event Consumer thread got notification and consuming items.
Vehicles can move" 17 while event. In the above program driver thread has to wait until Trafficpolice thread sets event. Once traffic police thread clears event giving RED Signal then the driver thread has to wait. Interthread communication by using Condition Object: Condition is the more advanced version of Event object for interthread communication. A condition represents some kind of state change in the application like producing item or consuming item.
Threads can wait for that condition and threads can be notified once condition happend. Condition is always associated with a lock ReentrantLock. A condition has acquire and release methods that call the corresponding methods of the associated lock. Methods of Condition: 1. Case Study: The producing thread needs to acquire the Condition before producing item to the resource and notifying the consumers. Producer Thread Consumer Thread condition.
In the above program Consumer thread expecting updation and hence it is responsible to call wait method on Condition object. Producer thread performing updation and hence it is responsible to call notify or notifyAll on Condition object. Queue internally has Condition and that Condition has Lock. Hence whenever we are using Queue we are not required to worry about Synchronization.
Important Methods of Queue: 1. Producer Thread uses put method to insert data in the queue. Internally this method has logic to acquire the lock before inserting data into queue.
After inserting data lock will be released automatically. Consumer Thread uses get method to remove and get data from the queue. Internally this method has logic to acquire the lock before removing data from the queue.
Once removal completed then the lock will be released automatically. If the queue is empty then consumer thread will entered into waiting state by calling wait method internally. Once queue updated with data then the thread will be notified automatically. This is Default Behaviour. Queue 3 q. LifoQueue 3 q. PriorityQueue 3 q. It is highly recommended to write code of releasing locks inside finally block.
The advantage is lock will be released always whether exception raised or not raised and whether handled or not handled. Lock l. It is highly recommended to acquire lock by using with statement. The main advantage of with statement is the lock will be released automatically once control reaches end of with block and we are not required to release explicitly.
Lock with lock: perform required safe operations lock will be released automatically. Wrong operations will lead to unexpected result. If you already have an account with us, ask your branch to give you Internet Banking. It doesn't do anything special. Check out how to accomplish hard reset by hardware keys and Android 10 settings. Family Hub Refrigerators. Android devices. Click on a term to search our site for related topics. Use Volume Up key to continue.
For the Samsung Galaxy Tab E you enter recovery mode by first powering down your tablet by holding down the power button until the screen prompts for the power off option. Interactive Solutions. All-In-One Settings Center. Ensure the device is powered off. Kiosk Mode. Held down Power the Volume down untill screen shut down and re booted. A master reset restores the original factory settings and may delete your personal data on the internal storage, such as downloads, ringtones, images, apps, contacts, and Visual Voicemail.
They will most likely help you reflash the software update that caused the issue. Follow these steps to disable retail mode 1. For assistance, please call the toll-free number: Monday through Friday 7 a. Method 2: Via the settings menu You can also use the settings menu to discover what Samsung tablet you have. If you have a more recent Samsung model e. Access Usage Manager to view data usage, set data limits, and see the apps using the most data. Then wait a few seconds to boot your device into recovery mode.
Kiosk Mode locks your app down to either a couple of selected apps or a single app. Call for availability. And connect your Samsung device to computer via a USB cable. Toggle Make Windows more touch-friendly when using your device as a tablet to On to enable Tablet mode.
Pay your bill, add a phone line, upgrade a device, change your account, and much more in the My Account section of Xfinity Mobile. After you install and launch it, choose " Remove Screen Lock ". Since developer mode is one of the most powerful features in Android therefore to prevent any unauthorized access you have to enter the device password that you have set to continue further. Now you will see the boot menu displayed on your screen.
Launch the phone's Settings applications. With the help of this, you can store several kinds of data such as photos , videos , contacts , etc. You can stream video for up to 12 hours before you'll have to recharge. Hold down. These tablets are portable, have Wi-Fi capability, and come with a variety of other features — including easy-to-use parental controls in their Kids Mode app.
Find My Mobile Samsung Account Samsung Find My Mobile is an online service that allows you to remotely locate your phone, backup data, erase data, lock, or unlock the screen. Part 3. Fone will download recovery package. These codes are unique and specific to the manufacturer. Scroll down on the applications and tap on your Developer Options button. The first thing to do is to disable the retail mode of the firmware. Recovery Mode is a special boot option where you can also reset your Chromebook to its factory default state.
Step 1: Turn on your device with a SIM card. Also, you can click on Continue. If you are not able to reach the settings menu, you can do Samsung Galaxy Tab E 9. Otherwise, hope she didn't load too much un-replaceable data on it! Step 5 of 8. Open an account.
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