Sunday, 29 July 2018

Python | Why Python?

If you want to automate some task, example, you may wish to perform a search-and-replace over a large number of text files or rename and rearrange a bunch of photo files in a complicated way. Perhaps you’d like to write a small custom database, or a specialized GUI application, or a simple game.

If you’re a professional software developer, you may have to work with several C/C++/Java libraries but find the usual write/compile/test/re-compile cycle is too slow. Perhaps you’re writing a test suite for such a library and find writing the testing code a tedious task. Or maybe you’ve written a program that could use an extension language, and you don’t want to design and implement a whole new language for your application. Python is just the language for you.

Unix shell script or Windows batch files are also options for some of these tasks, but shell scripts are best at moving around files and changing text data, not well-suited for GUI applications or games and writing C/C++/Java programs can take a lot of development time to get even a first-draft program. Python is simpler to use, available on Windows, Mac OS X, and Unix operating systems, and will help you get the job done more quickly.

Python is simple to use, but it is a real programming language, offering much more structure and support for large programs than shell scripts or batch files can offer. On the other hand, Python also offers much more error checking than C, and, being a very-high-level language, it has high-level data types built in, such as flexible arrays and dictionaries. Because of its more general data types, Python is applicable to a much larger problem domain than Awk or even Perl, yet many things are at least as easy in Python as in those languages.

Python allows us to split the program into modules that can be reused in other Python programs. It comes with a large collection of standard modules which can be used as the basis of programs. Some of these modules provide things like file I/O, system calls, sockets, and even interfaces to graphical user interface toolkits.

Python is an interpreted language, which can save you considerable time during program development because no compilation and linking are necessary. The interpreter can be used interactively, which makes it easy to experiment with features of the language, to write throw-away programs, or to test functions during bottom-up program development. It is also a handy desk calculator.

Why Programs written in Python are typically much shorter than equivalent C, C++, or Java programs?
1. the high-level data types allow you to express complex operations in a single statement;
2. statement grouping is done by indentation instead of beginning and ending brackets;
3. no variable or argument declarations are necessary.

Python is extensible
If you know how to program in C it is easy to add a new built-in function or module to the interpreter, either to perform critical operations at maximum speed or to link Python programs to libraries that may only be available in binary form (such as a vendor-specific graphics library). Once you are really hooked, you can link the Python interpreter into an application written in C and use it as an extension or command language for that application.

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