Server Side Programming Articles - Page 2249 of 2650

The all important The FTP class in ftplib module implements the client side of the FTP protocol.To establish connection with a FTP server, obtain FTP object.con=FTP(hostname)The FTP class supports following methods −connect()Connect to the given host and port. The default port number is 21, as specified by the FTP protocol specification.Getwelcome()Return the welcome message sent by the server in reply to the initial connection.login(user='anonymous', passwd='', acct='')Log in as the given user. The passwd and acct parameters are optional and default to the empty string. If no user is specified, it defaults to 'anonymous'. If user is 'anonymous', the default passwd ... Read More

The zipapp module has been introduced in Python's standard library since ver 3.5. This module is used to manage the creation of zip files containing Python code, which can be executed directly by the Python interpreter. The module provides both a Command-Line Interface and a programming interface.To use zipapp module programmatically, we should have a module in which main function is present. The executable archive is built by following command −python -m zipapp myapp -m "example:main"Here, the current path should have a folder called myapp. In this folder, there should be example.py which must have main() function.Create myapp folder and ... Read More

Functions in the platform module help us probe the underlying platform’s hardware, operating system, and interpreter version information.architecture()This function queries the given executable (defaults to the Python interpreter executable) for various architecture information.>>> import platform >>> platform.architecture() ('64bit', '')machine()This function returns the machine type, e.g. 'i386'. An empty string is returned if the value cannot be determined.>>> platform.machine() 'x86_64'node()This function returns the computer’s network name.>>> platform.node() 'malhar-ubuntu'platform(aliased=0, terse=0)This function returns a single string identifying the underlying platform.>>> platform.platform() 'Linux-4.13.0-46-generic-x86_64-with-debian-stretch-sid'processor()This function returns the (real) processor name.>>> platform.processor() 'x86_64'python_build()This function returns a tuple (buildno, builddate)>>> platform.python_build() ('default', 'Oct 13 2017 12:02:49')python_compiler()This function ... Read More

Python’s sys module provides access to any command-line arguments via the sys.argv. sys.argv is the list of command-line arguments and sys.argv[0] is the program ie. the script name.Save following code as args.pyimport sys print ('argument list', sys.argv)Execute above script from command line as follows:C:\python37>python args.py 11 22 argument list ['args.py', '11', '22']The getopt module has funcions toparse the command line arguments in sys.argv. It supports the same conventions as the Unix getopt() function (including the special meanings of arguments of the form ‘-‘ and ‘--‘).API is designed to be familiar to users of the C getopt() function.getopt(args, shortopts, longopts=[])Parses command ... Read More

Here we will see the fesetround() and fegetround() method in C++. These methods can be found in the cfenv library.The fesetround() method is used to set the specified floating point rounding direction to the current rounding direction. This is used with rint(), nearbyint() and some other rounding functions in C++.The syntax is like below −int fesetround(int round);The round can be among these FE_TONEAREST, FE_DOWNWARD, FE_UPWARD etc. This function returns 0 when rounding direction is successfully applied to the required manner.Example#include #include #include using namespace std; main() {    double x = 4.7, ans;    fesetround(FE_TONEAREST); //round to ... Read More

In C++, we can use the function overloading techniques. But if some base class has one method in overloaded form (different function signature with the same name), and the derived class redefines one of the function which is present inside the base, then all of the overloaded version of that function will be hidden from the derived class.Let us see one example to get the clear idea.Example#include using namespace std; class MyBaseClass {    public:       void my_function() {          cout

In C++, the friendship is not inherited. It means that, if one parent class has some friend functions, then the child class will not get them as friend.In this example it will generate an error because the display() function is friend of MyBaseClass but not the friend of MyDerivedClass. The display() can access the private member of MyBaseClass.Example#include using namespace std; class MyBaseClass {    protected:       int x;    public:       MyBaseClass() {          x = 20;       }       friend void display(); }; class MyDerivedClass : public MyBaseClass {    private:       int y;    public:       MyDerivedClass() {          x = 40;       } }; void display() {    MyDerivedClass derived;    cout

Here we will see how we can extend some namespace, and how the unnamed or anonymous name space can be used.Sometimes we can define one namespace. Then we can write the namespace again with the same definition. If the first one has some member, and second one has some other members, then the namespace is extended. We can use all of the members from that namespace.Example#include using namespace std; namespace my_namespace {    int my_var = 10; } namespace my_namespace { //extending namespace    int my_new_var = 40; } main() {    cout

In every C/C++ program, execution starts from the main() function. Defining multiple main() functions will result in a compilation error. Can main() be Overloaded in C++? No, we cannot overload the main() function in C++ because main() serves as the entry point of any C++ program and must follow a predefined prototype. While C++ does support function overloading (i.e., multiple functions with the same name but different parameters), this does not apply to the main() function. If you try to create multiple main() functions will result in a compilation error due to invalid overloading. The following are the only two ... Read More

In C++, function overloading and const keyword are used for different purposes. Function overloading provides different ways to call a function with different parameter types that make the program more readable. While the const keyword provides the ways of declaration such as variable, member variable, function parameters, member function, and return type. What is Function Overloading? Function overloading is the process of defining multiple functions having the same name but different parameter lists. It is also known as compile-time polymorphism. Here, we have list of three points to describe function overloading in C++: The parameter ... Read More