Hello, I’m B

Ans. JSON stands for JavaScript Object Notation. It is a highly popular data format, and it stores data into NoSQL databases. JSON is generally built on the following two structures:

Python supports JSON parsers. In fact, JSON-based data is internally represented as a dictionary in Python. To convert JSON data into Python data, we use the load() function from the JSON module.

Python Vs Java

Comparison Python Java

Triple quotes ‘’”” or ‘“ are string delimiters that can span multiple lines in Python. Triple quotes are usually used when spanning multiple lines, or enclosing a string that has a mix of single and double quotes contained therein.

That is just an editor and a graphical version of the interactive shell. You write or load code and run it, or type it into the shell.

There is no automated testing.

Python versions are numbered A.B.C or A.B.

You may also find version numbers with a “+” suffix, e.g. “2.2+”. These are unreleased versions, built directly from the subversion trunk. In practice, after a final minor release is made, the subversion trunk is incremented to the next minor version, which becomes the “a0” version, e.g. “2.4a0”.

If you can’t find a source file for a module, it may be a built-in or dynamically loaded module implemented in C, C++ or other compiled language. In this case you may not have the source file or it may be something like mathmodule.c, somewhere in a C source directory (not on the Python Path). There are (at least) three kinds of modules in Python:

- Modules written in C and linked with the interpreter; to get a list of these, type;

Import sys print sys.builtin_module_names;

You need to do two things:

The script file’s mode must be executable and the first line must begin with “#!” followed by the path of the Python interpreter.

The minor disadvantage is that this defines the script’s `__doc__`string. However, you can fix that by adding:

The most common problem is that the signal handler is declared with the wrong argument list. It is called as:

handler (signum, frame)

Re-link it using g++ (change LINKCC in the python Modules Makefile)

Link your extension module using g++ (e.g., “g++ -shared -o mymodule.so mymodule.o”).

Use the standard library module smtplib. Here’s a very simple interactive mail sender that uses it. This method will work on any host that supports an SMTP listener.

if sts != 0:

print (“Sendmail exit status”, sts)

Yes. Here’s a simple example that uses httplib:

query_string

‘name=Guy%20Steele,%20Jr.’

As soon as the main thread exits, all threads are killed. Your main thread is running too quickly, giving the threads no time to do any work.

A simple fix is to add a sleep to the end of the program that’s long enough for all the threads to finish:

for i in range(10)

Download the required 3.6.1 python, executable installer file from the www.python.org.com website.

Now path setting is secured.

Python program can be implemented by two ways

`-1000`

- Numbers- Numbers use to hold numerical values.

The concept of binding or grouping related data members along with its related functionalities is known as a Encapsulation.

DML (Data Modification Language) Commands are used to modify the data of the database objects

While getting the one by value element from the iterable object if stop iteration exception is raised then for loop internally handle that exception

OS Module is a predefined module and which provides various functions and methods to perform the operating system related activities, such as creating the files, removing the files, creating the directories removing the directories, executing the operating system related commands, etc.

Example:

Output:

Applications of Python

Pass means, no-operation Python statement, or in other words it is a place holder in compound statement, where there should be a blank left and nothing has to be written there.

In Python, iterators are used to iterate a group of elements, containers like list.

A mechanism to select a range of items from sequence types like list, tuple, strings etc. is known as slicing.

The way of implementing iterators are known as generators. It is a normal function except that it yields expression in the function.

Python generator produces a sequence of values to iterate on. This way, it is kind of an iterable. We define a function that ‘yields’ values one by one, and then use a for loop to iterate on it.

- Iterators are more memory-efficient.

To copy an object in Python, you can try copy.copy () or copy.deepcopy() for the general case. You cannot copy all objects but most of them.

In order to convert a number into a string, use the inbuilt function str(). If you want a octal or hexadecimal representation, use the inbuilt function oct() or hex().

In Python, module is the way to structure program. Each Python program file is a module, which imports other modules like objects and attributes.

The folder of Python program is a package of modules. A package can have modules or subfolders.

Local variables: If a variable is assigned a new value anywhere within the function's body, it's assumed to be local.

Global variables: Those variables that are only referenced inside a function are implicitly global.

To share global variables across modules within a single program, create a special module. Import the config module in all modules of your application. The module will be available as a global variable across modules.

To make a Python Script executable on Unix, you need to do two things,

Script file's mode must be executable and

the first line must begin with # ( #!/usr/local/bin/python)

By using a command os.remove (filename) or os.unlink(filename)

To generate random numbers in Python, you need to import command as

Module = =PyImport_ImportModule("<modulename>");

It is a Floor Divisionoperator , which is used for dividing two operands with the result as quotient showing only digits before the decimal point. For instance, 10//5 = 2 and 10.0//5.0 = 2.0.

- Python comprises of a huge standard library for most Internet platforms like Email, HTML, etc.

- Python does not require explicit memory management as the interpreter itself allocates the memory to new variables and free them automatically

- Provide easy readability due to use of square brackets

- Easy-to-learn for beginners

- Having the built-in data types saves programming time and effort from declaring variables

The use of the split function in Python is that it breaks a string into shorter strings using the defined separator. It gives a list of all words present in the string.

Flask is a "microframework" primarily build for a small application with simpler requirements. In flask, you have to use external libraries. Flask is ready to use.

The data in the failed server won't get removed, but there is a provision for auto-failure, which you can configure for multiple nodes. Fail-over can be triggered during any kind of socket or Memcached server level errors and not during normal client errors like adding an existing key, etc.

- When one instance fails, several of them goes down, this will put larger load on the database server when lost data is reloaded as client make a request. To avoid this, if your code has been written to minimize cache stampedes then it will leave a minimal impact

- Another way is to bring up an instance of Memcached on a new machine using the lost machines IP address